diff --git a/ext/gd/gd.c b/ext/gd/gd.c
index a64f02aa22c3d..2cb33503fed81 100644
--- a/ext/gd/gd.c
+++ b/ext/gd/gd.c
@@ -1869,20 +1869,20 @@ PHP_FUNCTION(imagexbm)
 	zval *imgind;
 	char *file = NULL;
 	size_t file_len = 0;
-	zend_long foreground_color = -1;
+	zend_long foreground_color;
+	zend_bool foreground_color_is_null = 1;
 	gdImagePtr im;
-	int argc = ZEND_NUM_ARGS();
 	int i;
 	gdIOCtx *ctx = NULL;
 	php_stream *stream;
 
-	if (zend_parse_parameters(argc, "Op!|l", &imgind, gd_image_ce, &file, &file_len, &foreground_color) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "Op!|l!", &imgind, gd_image_ce, &file, &file_len, &foreground_color, &foreground_color_is_null) == FAILURE) {
 		RETURN_THROWS();
 	}
 
 	im = php_gd_libgdimageptr_from_zval_p(imgind);
 
-	if (argc > 1 && file != NULL) {
+	if (file != NULL) {
 		stream = php_stream_open_wrapper(file, "wb", REPORT_ERRORS|IGNORE_PATH|IGNORE_URL_WIN, NULL);
 		if (stream == NULL) {
 			RETURN_FALSE;
@@ -1893,10 +1893,13 @@ PHP_FUNCTION(imagexbm)
 		ctx = create_output_context();
 	}
 
-	if (argc < 3) {
+	if (foreground_color_is_null) {
 		for (i=0; i < gdImageColorsTotal(im); i++) {
-			if (!gdImageRed(im, i) && !gdImageGreen(im, i) && !gdImageBlue(im, i)) break;
+			if (!gdImageRed(im, i) && !gdImageGreen(im, i) && !gdImageBlue(im, i)) {
+				break;
+			}
 		}
+
 		foreground_color = i;
 	}
 
@@ -1946,20 +1949,20 @@ PHP_FUNCTION(imagejpeg)
 PHP_FUNCTION(imagewbmp)
 {
 	zval *imgind;
-	zend_long foreground_color = -1;
+	zend_long foreground_color;
+	zend_long foreground_color_is_null = 1;
 	gdImagePtr im;
-	int argc = ZEND_NUM_ARGS();
 	int i;
 	gdIOCtx *ctx = NULL;
 	zval *to_zval = NULL;
 
-	if (zend_parse_parameters(argc, "O|z!l", &imgind, gd_image_ce, &to_zval, &foreground_color) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "O|z!l!", &imgind, gd_image_ce, &to_zval, &foreground_color) == FAILURE) {
 		RETURN_THROWS();
 	}
 
 	im = php_gd_libgdimageptr_from_zval_p(imgind);
 
-	if (argc > 1 && to_zval != NULL) {
+	if (to_zval != NULL) {
 		ctx = create_stream_context_from_zval(to_zval);
 		if (!ctx) {
 			RETURN_FALSE;
@@ -1968,10 +1971,11 @@ PHP_FUNCTION(imagewbmp)
 		ctx = create_output_context();
 	}
 
-	if (argc < 3) {
+	if (foreground_color_is_null) {
 		for (i=0; i < gdImageColorsTotal(im); i++) {
-			if (!gdImageRed(im, i) && !gdImageGreen(im, i) && !gdImageBlue(im, i))
+			if (!gdImageRed(im, i) && !gdImageGreen(im, i) && !gdImageBlue(im, i)) {
 				break;
+			}
 		}
 
 		foreground_color = i;
@@ -2006,17 +2010,16 @@ PHP_FUNCTION(imagebmp)
 	zval *imgind;
 	zend_bool compressed = 1;
 	gdImagePtr im;
-	int argc = ZEND_NUM_ARGS();
 	gdIOCtx *ctx = NULL;
 	zval *to_zval = NULL;
 
-	if (zend_parse_parameters(argc, "O|z!b", &imgind, gd_image_ce, &to_zval, &compressed) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "O|z!b", &imgind, gd_image_ce, &to_zval, &compressed) == FAILURE) {
 		RETURN_THROWS();
 	}
 
 	im = php_gd_libgdimageptr_from_zval_p(imgind);
 
-	if (argc > 1 && to_zval != NULL) {
+	if (to_zval != NULL) {
 		ctx = create_stream_context_from_zval(to_zval);
 		if (!ctx) {
 			RETURN_FALSE;
@@ -2555,16 +2558,16 @@ PHP_FUNCTION(imagecolortransparent)
 {
 	zval *IM;
 	zend_long COL = 0;
+	zend_bool COL_IS_NULL = 1;
 	gdImagePtr im;
-	int argc = ZEND_NUM_ARGS();
 
-	if (zend_parse_parameters(argc, "O|l", &IM, gd_image_ce, &COL) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "O|l!", &IM, gd_image_ce, &COL, &COL_IS_NULL) == FAILURE) {
 		RETURN_THROWS();
 	}
 
 	im = php_gd_libgdimageptr_from_zval_p(IM);
 
-	if (argc > 1) {
+	if (!COL_IS_NULL) {
 		gdImageColorTransparent(im, COL);
 	}
 
@@ -2576,17 +2579,17 @@ PHP_FUNCTION(imagecolortransparent)
 PHP_FUNCTION(imageinterlace)
 {
 	zval *IM;
-	int argc = ZEND_NUM_ARGS();
 	zend_long INT = 0;
+	zend_bool INT_IS_NULL = 1;
 	gdImagePtr im;
 
-	if (zend_parse_parameters(argc, "O|l", &IM, gd_image_ce, &INT) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "O|l!", &IM, gd_image_ce, &INT, &INT_IS_NULL) == FAILURE) {
 		RETURN_THROWS();
 	}
 
 	im = php_gd_libgdimageptr_from_zval_p(IM);
 
-	if (argc > 1) {
+	if (!INT_IS_NULL) {
 		gdImageInterlace(im, INT);
 	}
 
@@ -2603,15 +2606,16 @@ static void php_imagepolygon(INTERNAL_FUNCTION_PARAMETERS, int filled)
 {
 	zval *IM, *POINTS;
 	zend_long NPOINTS, COL;
+	zend_bool COL_IS_NULL = 1;
 	zval *var = NULL;
 	gdImagePtr im;
 	gdPointPtr points;
 	int npoints, col, nelem, i;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "Oal|l", &IM, gd_image_ce, &POINTS, &NPOINTS, &COL) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "Oal|l!", &IM, gd_image_ce, &POINTS, &NPOINTS, &COL, &COL_IS_NULL) == FAILURE) {
 		RETURN_THROWS();
 	}
-	if (ZEND_NUM_ARGS() == 3) {
+	if (COL_IS_NULL) {
 		COL = NPOINTS;
 		NPOINTS = zend_hash_num_elements(Z_ARRVAL_P(POINTS));
 		if (NPOINTS % 2 != 0) {
@@ -3733,7 +3737,7 @@ PHP_FUNCTION(imageaffine)
 	int i, nelems;
 	zval *zval_affine_elem = NULL;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "Oa|a", &IM, gd_image_ce, &z_affine, &z_rect) == FAILURE)  {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "Oa|a!", &IM, gd_image_ce, &z_affine, &z_rect) == FAILURE)  {
 		RETURN_THROWS();
 	}
 
@@ -3856,7 +3860,7 @@ PHP_FUNCTION(imageaffinematrixget)
 			double angle;
 
 			if (!options) {
-				zend_argument_type_error(2, "must be of type int|double when using rotate or shear");
+				zend_argument_type_error(2, "must be of type int|float when using rotate or shear");
 				RETURN_THROWS();
 			}
 
@@ -4003,26 +4007,29 @@ PHP_FUNCTION(imageresolution)
 {
 	zval *IM;
 	gdImagePtr im;
-	zend_long res_x = GD_RESOLUTION, res_y = GD_RESOLUTION;
+	zend_long res_x, res_y;
+	zend_bool res_x_is_null = 1, res_y_is_null = 1;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "O|ll", &IM, gd_image_ce, &res_x, &res_y) == FAILURE)  {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "O|l!l!", &IM, gd_image_ce, &res_x, &res_x_is_null, &res_y, &res_y_is_null) == FAILURE)  {
 		RETURN_THROWS();
 	}
 
 	im = php_gd_libgdimageptr_from_zval_p(IM);
 
-	switch (ZEND_NUM_ARGS()) {
-		case 3:
-			gdImageSetResolution(im, res_x, res_y);
-			RETURN_TRUE;
-		case 2:
-			gdImageSetResolution(im, res_x, res_x);
-			RETURN_TRUE;
-		default:
-			array_init(return_value);
-			add_next_index_long(return_value, gdImageResolutionX(im));
-			add_next_index_long(return_value, gdImageResolutionY(im));
+	if (!res_x_is_null && !res_y_is_null) {
+		gdImageSetResolution(im, res_x, res_y);
+		RETURN_TRUE;
+	} else if (!res_x_is_null && res_y_is_null) {
+		gdImageSetResolution(im, res_x, res_x);
+		RETURN_TRUE;
+	} else if (res_x_is_null && !res_y_is_null) {
+		gdImageSetResolution(im, res_y, res_y);
+		RETURN_TRUE;
 	}
+
+	array_init(return_value);
+	add_next_index_long(return_value, gdImageResolutionX(im));
+	add_next_index_long(return_value, gdImageResolutionY(im));
 }
 /* }}} */
 
@@ -4151,24 +4158,26 @@ static void _php_image_output_ctx(INTERNAL_FUNCTION_PARAMETERS, int image_type,
 	zval *imgind;
 	zend_long quality = -1, basefilter = -1;
 	gdImagePtr im;
-	int argc = ZEND_NUM_ARGS();
-	int i;
 	gdIOCtx *ctx = NULL;
 	zval *to_zval = NULL;
 
-	if (image_type == PHP_GDIMG_TYPE_PNG) {
-		if (zend_parse_parameters(argc, "O|z!ll", &imgind, gd_image_ce, &to_zval, &quality, &basefilter) == FAILURE) {
+	if (image_type == PHP_GDIMG_TYPE_GIF) {
+		if (zend_parse_parameters(ZEND_NUM_ARGS(), "O|z", &imgind, gd_image_ce, &to_zval) == FAILURE) {
+			RETURN_THROWS();
+		}
+	} else if (image_type == PHP_GDIMG_TYPE_PNG) {
+		if (zend_parse_parameters(ZEND_NUM_ARGS(), "O|z!ll", &imgind, gd_image_ce, &to_zval, &quality, &basefilter) == FAILURE) {
 			RETURN_THROWS();
 		}
 	} else {
-		if (zend_parse_parameters(argc, "O|z!l", &imgind, gd_image_ce, &to_zval, &quality) == FAILURE) {
+		if (zend_parse_parameters(ZEND_NUM_ARGS(), "O|z!l", &imgind, gd_image_ce, &to_zval, &quality) == FAILURE) {
 			RETURN_THROWS();
 		}
 	}
 
 	im = php_gd_libgdimageptr_from_zval_p(imgind);
 
-	if (argc > 1 && to_zval != NULL) {
+	if (to_zval != NULL) {
 		ctx = create_stream_context_from_zval(to_zval);
 		if (!ctx) {
 			RETURN_FALSE;
@@ -4190,16 +4199,6 @@ static void _php_image_output_ctx(INTERNAL_FUNCTION_PARAMETERS, int image_type,
 		case PHP_GDIMG_TYPE_PNG:
 			(*func_p)(im, ctx, (int) quality, (int) basefilter);
 			break;
-		case PHP_GDIMG_TYPE_WBM:
-			if (argc < 3) {
-				for (i=0; i < gdImageColorsTotal(im); i++) {
-					if (!gdImageRed(im, i) && !gdImageGreen(im, i) && !gdImageBlue(im, i)) break;
-				}
-				quality = (int) i;
-			}
-
-			(*func_p)(im, (int) quality, ctx);
-			break;
 		case PHP_GDIMG_TYPE_GIF:
 			(*func_p)(im, ctx);
 			break;
diff --git a/ext/gd/gd.stub.php b/ext/gd/gd.stub.php
index a284944102e1f..22f2c4f256f44 100644
--- a/ext/gd/gd.stub.php
+++ b/ext/gd/gd.stub.php
@@ -10,7 +10,7 @@ function gd_info(): array {}
 
 function imageloadfont(string $filename): int|false {}
 
-function imagesetstyle($im, array $styles): bool {}
+function imagesetstyle(GdImage $im, array $styles): bool {}
 
 function imagecreatetruecolor(int $x_size, int $y_size): GdImage|false {}
 
@@ -20,7 +20,7 @@ function imagetruecolortopalette(GdImage $im, bool $ditherFlag, int $colorWanted
 
 function imagepalettetotruecolor(GdImage $im): bool {}
 
-function imagecolormatch($im1, $im2): bool {}
+function imagecolormatch(GdImage $im1, GdImage $im2): bool {}
 
 function imagesetthickness(GdImage $im, int $thickness): bool {}
 
@@ -54,9 +54,9 @@ function imagegrabscreen(): GdImage|false {}
 
 function imagerotate(GdImage $im, float $angle, int $bgdcolor, int $ignoretransparent = 0): GdImage|false {}
 
-function imagesettile(GdImage $im, $tile): bool {}
+function imagesettile(GdImage $im, GdImage $tile): bool {}
 
-function imagesetbrush(GdImage $im, $brush): bool {}
+function imagesetbrush(GdImage $im, GdImage $brush): bool {}
 
 function imagecreate(int $x_size, int $y_size): GdImage|false {}
 
@@ -100,30 +100,36 @@ function imagecreatefrombmp(string $filename): GdImage|false {}
 function imagecreatefromtga(string $filename): GdImage|false {}
 #endif
 
-function imagexbm(GdImage $im, ?string $filename, int $foreground = UNKNOWN): bool {}
+function imagexbm(GdImage $im, ?string $filename, ?int $foreground = null): bool {}
 
+/** @param resource|string|null $to */
 function imagegif(GdImage $im, $to = null): bool {}
 
 #ifdef HAVE_GD_PNG
-function imagepng(GdImage $im, $to = null, int $quality = UNKNOWN, int $filters = UNKNOWN): bool {}
+/** @param resource|string|null $to */
+function imagepng(GdImage $im, $to = null, int $quality = -1, int $filters = -1): bool {}
 #endif
 
 #ifdef HAVE_GD_WEBP
-function imagewebp(GdImage $im, $to = null, int $quality = UNKNOWN): bool {}
+/** @param resource|string|null $to */
+function imagewebp(GdImage $im, $to = null, int $quality = -1): bool {}
 #endif
 
 #ifdef HAVE_GD_JPG
-function imagejpeg(GdImage $im, $to = null, int $quality = UNKNOWN): bool {}
+/** @param resource|string|null $to */
+function imagejpeg(GdImage $im, $to = null, int $quality = -1): bool {}
 #endif
 
-function imagewbmp(GdImage $im, $to = null, int $foreground = UNKNOWN): bool {}
+/** @param resource|string|null $to */
+function imagewbmp(GdImage $im, $to = null, ?int $foreground = null): bool {}
 
 function imagegd(GdImage $im, $to = UNKNOWN): bool {}
 
 function imagegd2(GdImage $im, $to = UNKNOWN, int $chunk_size = UNKNOWN, int $type = UNKNOWN): bool {}
 
 #ifdef HAVE_GD_BMP
-function imagebmp(GdImage $im, $to = null, int $compressed = 1): bool {}
+/** @param resource|string|null $to */
+function imagebmp(GdImage $im, $to = null, bool $compressed = true): bool {}
 #endif
 
 function imagedestroy(GdImage $im): bool {}
@@ -170,15 +176,15 @@ function imagefill(GdImage $im, int $x, int $y, int $col): bool {}
 
 function imagecolorstotal(GdImage $im): int {}
 
-function imagecolortransparent(GdImage $im, int $col = UNKNOWN): ?int {}
+function imagecolortransparent(GdImage $im, ?int $col = null): ?int {}
 
-function imageinterlace(GdImage $im, int $interlace = UNKNOWN): ?int {}
+function imageinterlace(GdImage $im, ?int $interlace = null): ?int {}
 
-function imagepolygon(GdImage $im, array $points, int $num_points_or_col, int $col = UNKNOWN): bool {}
+function imagepolygon(GdImage $im, array $points, int $num_points_or_col, ?int $col = null): bool {}
 
-function imageopenpolygon(GdImage $im, array $points, int $num_points_or_col, int $col = UNKNOWN): bool {}
+function imageopenpolygon(GdImage $im, array $points, int $num_points_or_col, ?int $col = null): bool {}
 
-function imagefilledpolygon(GdImage $im, array $points, int $num_points_or_col, int $col = UNKNOWN): bool {}
+function imagefilledpolygon(GdImage $im, array $points, int $num_points_or_col, ?int $col = null): bool {}
 
 function imagefontwidth(int $font): int {}
 
@@ -230,10 +236,11 @@ function imagecrop(GdImage $im, array $rect): GdImage|false {}
 
 function imagecropauto(GdImage $im, int $mode = IMG_CROP_DEFAULT, float $threshold = 0.5, int $color = -1): GdImage|false {}
 
-function imagescale(GdImage $im, int $new_width, int $new_height = UNKNOWN, int $mode = IMG_BILINEAR_FIXED): GdImage|false {}
+function imagescale(GdImage $im, int $new_width, int $new_height = -1, int $mode = IMG_BILINEAR_FIXED): GdImage|false {}
 
-function imageaffine(GdImage $im, array $affine, array $clip = UNKNOWN): GdImage|false {}
+function imageaffine(GdImage $im, array $affine, ?array $clip = null): GdImage|false {}
 
+/** @param array|int|float $options */
 function imageaffinematrixget(int $type, $options = UNKNOWN): array|false {}
 
 function imageaffinematrixconcat(array $m1, array $m2): array|false {}
@@ -242,4 +249,4 @@ function imagegetinterpolation(GdImage $im): int {}
 
 function imagesetinterpolation(GdImage $im, int $method = IMG_BILINEAR_FIXED): bool {}
 
-function imageresolution(GdImage $im, int $res_x = UNKNOWN, int $res_y = UNKNOWN): array|bool {}
+function imageresolution(GdImage $im, ?int $res_x = null, ?int $res_y = null): array|bool {}
diff --git a/ext/gd/gd_arginfo.h b/ext/gd/gd_arginfo.h
index 5209f7a34c279..371c3e2ecbc79 100644
--- a/ext/gd/gd_arginfo.h
+++ b/ext/gd/gd_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: bb1f9f45ea75ccb96886d8fe5a2bc8f5c06e6661 */
+ * Stub hash: 14cd8fc3865f7ef2b88c4834fbf33d360b302794 */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_gd_info, 0, 0, IS_ARRAY, 0)
 ZEND_END_ARG_INFO()
@@ -9,7 +9,7 @@ ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_imageloadfont, 0, 1, MAY_BE_LONG
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_imagesetstyle, 0, 2, _IS_BOOL, 0)
-	ZEND_ARG_INFO(0, im)
+	ZEND_ARG_OBJ_INFO(0, im, GdImage, 0)
 	ZEND_ARG_TYPE_INFO(0, styles, IS_ARRAY, 0)
 ZEND_END_ARG_INFO()
 
@@ -31,8 +31,8 @@ ZEND_END_ARG_INFO()
 #define arginfo_imagepalettetotruecolor arginfo_imageistruecolor
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_imagecolormatch, 0, 2, _IS_BOOL, 0)
-	ZEND_ARG_INFO(0, im1)
-	ZEND_ARG_INFO(0, im2)
+	ZEND_ARG_OBJ_INFO(0, im1, GdImage, 0)
+	ZEND_ARG_OBJ_INFO(0, im2, GdImage, 0)
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_imagesetthickness, 0, 2, _IS_BOOL, 0)
@@ -124,12 +124,12 @@ ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_imagesettile, 0, 2, _IS_BOOL, 0)
 	ZEND_ARG_OBJ_INFO(0, im, GdImage, 0)
-	ZEND_ARG_INFO(0, tile)
+	ZEND_ARG_OBJ_INFO(0, tile, GdImage, 0)
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_imagesetbrush, 0, 2, _IS_BOOL, 0)
 	ZEND_ARG_OBJ_INFO(0, im, GdImage, 0)
-	ZEND_ARG_INFO(0, brush)
+	ZEND_ARG_OBJ_INFO(0, brush, GdImage, 0)
 ZEND_END_ARG_INFO()
 
 #define arginfo_imagecreate arginfo_imagecreatetruecolor
@@ -200,7 +200,7 @@ ZEND_END_ARG_INFO()
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_imagexbm, 0, 2, _IS_BOOL, 0)
 	ZEND_ARG_OBJ_INFO(0, im, GdImage, 0)
 	ZEND_ARG_TYPE_INFO(0, filename, IS_STRING, 1)
-	ZEND_ARG_TYPE_INFO(0, foreground, IS_LONG, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, foreground, IS_LONG, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_imagegif, 0, 1, _IS_BOOL, 0)
@@ -212,8 +212,8 @@ ZEND_END_ARG_INFO()
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_imagepng, 0, 1, _IS_BOOL, 0)
 	ZEND_ARG_OBJ_INFO(0, im, GdImage, 0)
 	ZEND_ARG_INFO_WITH_DEFAULT_VALUE(0, to, "null")
-	ZEND_ARG_TYPE_INFO(0, quality, IS_LONG, 0)
-	ZEND_ARG_TYPE_INFO(0, filters, IS_LONG, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, quality, IS_LONG, 0, "-1")
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, filters, IS_LONG, 0, "-1")
 ZEND_END_ARG_INFO()
 #endif
 
@@ -221,7 +221,7 @@ ZEND_END_ARG_INFO()
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_imagewebp, 0, 1, _IS_BOOL, 0)
 	ZEND_ARG_OBJ_INFO(0, im, GdImage, 0)
 	ZEND_ARG_INFO_WITH_DEFAULT_VALUE(0, to, "null")
-	ZEND_ARG_TYPE_INFO(0, quality, IS_LONG, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, quality, IS_LONG, 0, "-1")
 ZEND_END_ARG_INFO()
 #endif
 
@@ -229,14 +229,14 @@ ZEND_END_ARG_INFO()
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_imagejpeg, 0, 1, _IS_BOOL, 0)
 	ZEND_ARG_OBJ_INFO(0, im, GdImage, 0)
 	ZEND_ARG_INFO_WITH_DEFAULT_VALUE(0, to, "null")
-	ZEND_ARG_TYPE_INFO(0, quality, IS_LONG, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, quality, IS_LONG, 0, "-1")
 ZEND_END_ARG_INFO()
 #endif
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_imagewbmp, 0, 1, _IS_BOOL, 0)
 	ZEND_ARG_OBJ_INFO(0, im, GdImage, 0)
 	ZEND_ARG_INFO_WITH_DEFAULT_VALUE(0, to, "null")
-	ZEND_ARG_TYPE_INFO(0, foreground, IS_LONG, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, foreground, IS_LONG, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_imagegd, 0, 1, _IS_BOOL, 0)
@@ -255,7 +255,7 @@ ZEND_END_ARG_INFO()
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_imagebmp, 0, 1, _IS_BOOL, 0)
 	ZEND_ARG_OBJ_INFO(0, im, GdImage, 0)
 	ZEND_ARG_INFO_WITH_DEFAULT_VALUE(0, to, "null")
-	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, compressed, IS_LONG, 0, "1")
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, compressed, _IS_BOOL, 0, "true")
 ZEND_END_ARG_INFO()
 #endif
 
@@ -363,19 +363,19 @@ ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_imagecolortransparent, 0, 1, IS_LONG, 1)
 	ZEND_ARG_OBJ_INFO(0, im, GdImage, 0)
-	ZEND_ARG_TYPE_INFO(0, col, IS_LONG, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, col, IS_LONG, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_imageinterlace, 0, 1, IS_LONG, 1)
 	ZEND_ARG_OBJ_INFO(0, im, GdImage, 0)
-	ZEND_ARG_TYPE_INFO(0, interlace, IS_LONG, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, interlace, IS_LONG, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_imagepolygon, 0, 3, _IS_BOOL, 0)
 	ZEND_ARG_OBJ_INFO(0, im, GdImage, 0)
 	ZEND_ARG_TYPE_INFO(0, points, IS_ARRAY, 0)
 	ZEND_ARG_TYPE_INFO(0, num_points_or_col, IS_LONG, 0)
-	ZEND_ARG_TYPE_INFO(0, col, IS_LONG, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, col, IS_LONG, 1, "null")
 ZEND_END_ARG_INFO()
 
 #define arginfo_imageopenpolygon arginfo_imagepolygon
@@ -540,14 +540,14 @@ ZEND_END_ARG_INFO()
 ZEND_BEGIN_ARG_WITH_RETURN_OBJ_TYPE_MASK_EX(arginfo_imagescale, 0, 2, GdImage, MAY_BE_FALSE)
 	ZEND_ARG_OBJ_INFO(0, im, GdImage, 0)
 	ZEND_ARG_TYPE_INFO(0, new_width, IS_LONG, 0)
-	ZEND_ARG_TYPE_INFO(0, new_height, IS_LONG, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, new_height, IS_LONG, 0, "-1")
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, mode, IS_LONG, 0, "IMG_BILINEAR_FIXED")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_OBJ_TYPE_MASK_EX(arginfo_imageaffine, 0, 2, GdImage, MAY_BE_FALSE)
 	ZEND_ARG_OBJ_INFO(0, im, GdImage, 0)
 	ZEND_ARG_TYPE_INFO(0, affine, IS_ARRAY, 0)
-	ZEND_ARG_TYPE_INFO(0, clip, IS_ARRAY, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, clip, IS_ARRAY, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_imageaffinematrixget, 0, 1, MAY_BE_ARRAY|MAY_BE_FALSE)
@@ -569,8 +569,8 @@ ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_imageresolution, 0, 1, MAY_BE_ARRAY|MAY_BE_BOOL)
 	ZEND_ARG_OBJ_INFO(0, im, GdImage, 0)
-	ZEND_ARG_TYPE_INFO(0, res_x, IS_LONG, 0)
-	ZEND_ARG_TYPE_INFO(0, res_y, IS_LONG, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, res_x, IS_LONG, 1, "null")
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, res_y, IS_LONG, 1, "null")
 ZEND_END_ARG_INFO()
 
 
diff --git a/ext/gd/tests/bug67248.phpt b/ext/gd/tests/bug67248.phpt
index b54a20ba8e336..054ba52861caf 100644
--- a/ext/gd/tests/bug67248.phpt
+++ b/ext/gd/tests/bug67248.phpt
@@ -18,8 +18,8 @@ for($i=0;$i<7;$i++) {
 --EXPECT--
 !! [TypeError] imageaffinematrixget(): Argument #1 ($type) must be of type array when using translate or scale
 !! [TypeError] imageaffinematrixget(): Argument #1 ($type) must be of type array when using translate or scale
-!! [TypeError] imageaffinematrixget(): Argument #2 ($options) must be of type int|double when using rotate or shear
-!! [TypeError] imageaffinematrixget(): Argument #2 ($options) must be of type int|double when using rotate or shear
-!! [TypeError] imageaffinematrixget(): Argument #2 ($options) must be of type int|double when using rotate or shear
+!! [TypeError] imageaffinematrixget(): Argument #2 ($options) must be of type int|float when using rotate or shear
+!! [TypeError] imageaffinematrixget(): Argument #2 ($options) must be of type int|float when using rotate or shear
+!! [TypeError] imageaffinematrixget(): Argument #2 ($options) must be of type int|float when using rotate or shear
 !! [ValueError] imageaffinematrixget(): Argument #1 ($type) must be a valid element type
 !! [ValueError] imageaffinematrixget(): Argument #1 ($type) must be a valid element type
diff --git a/ext/gd/tests/bug75437.phpt b/ext/gd/tests/bug75437.phpt
deleted file mode 100644
index 7da6d2f2361b0..0000000000000
--- a/ext/gd/tests/bug75437.phpt
+++ /dev/null
@@ -1,17 +0,0 @@
---TEST--
-Bug #75437 Wrong reflection on imagewebp
---SKIPIF--
-<?php
-if (!extension_loaded('gd')) die('skip gd extension not available');
-if (!GD_BUNDLED && version_compare(GD_VERSION, '2.2.0', '<')) die("skip test requires GD 2.2.0 or higher");
-if (!function_exists('imagewebp')) die('skip WebP support not available');
-?>
---FILE--
-<?php
-$rf = new ReflectionFunction('imagewebp');
-var_dump($rf->getNumberOfParameters());
-var_dump($rf->getNumberOfRequiredParameters());
-?>
---EXPECT--
-int(3)
-int(1)
diff --git a/ext/mbstring/mbstring.c b/ext/mbstring/mbstring.c
index 393cd44da4e0d..7bed59422c151 100644
--- a/ext/mbstring/mbstring.c
+++ b/ext/mbstring/mbstring.c
@@ -1304,7 +1304,7 @@ PHP_FUNCTION(mb_language)
 {
 	zend_string *name = NULL;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|S", &name) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|S!", &name) == FAILURE) {
 		RETURN_THROWS();
 	}
 	if (name == NULL) {
@@ -1330,7 +1330,7 @@ PHP_FUNCTION(mb_internal_encoding)
 	size_t name_len;
 	const mbfl_encoding *encoding;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|s", &name, &name_len) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|s!", &name, &name_len) == FAILURE) {
 		RETURN_THROWS();
 	}
 	if (name == NULL) {
@@ -1355,19 +1355,19 @@ PHP_FUNCTION(mb_internal_encoding)
 PHP_FUNCTION(mb_http_input)
 {
 	char *typ = NULL;
-	size_t typ_len;
+	size_t typ_len = 0;
 	int retname;
 	char *list, *temp;
 	const mbfl_encoding *result = NULL;
 
 	retname = 1;
- 	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|s", &typ, &typ_len) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|s!", &typ, &typ_len) == FAILURE) {
 		RETURN_THROWS();
- 	}
- 	if (typ == NULL) {
- 		result = MBSTRG(http_input_identify);
- 	} else {
- 		switch (*typ) {
+	}
+	if (typ == NULL) {
+		result = MBSTRG(http_input_identify);
+	} else {
+		switch (*typ) {
 		case 'G':
 		case 'g':
 			result = MBSTRG(http_input_identify_get);
@@ -1452,7 +1452,7 @@ PHP_FUNCTION(mb_http_output)
 	size_t name_len;
 	const mbfl_encoding *encoding;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|s", &name, &name_len) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|s!", &name, &name_len) == FAILURE) {
 		RETURN_THROWS();
 	}
 
@@ -1482,7 +1482,7 @@ PHP_FUNCTION(mb_detect_order)
 
 	ZEND_PARSE_PARAMETERS_START(0, 1)
 		Z_PARAM_OPTIONAL
-		Z_PARAM_STR_OR_ARRAY_HT(order_str, order_ht)
+		Z_PARAM_STR_OR_ARRAY_HT_OR_NULL(order_str, order_ht)
 	ZEND_PARSE_PARAMETERS_END();
 
 	if (!order_str && !order_ht) {
@@ -1814,7 +1814,7 @@ PHP_FUNCTION(mb_str_split)
 		Z_PARAM_STR(str)
 		Z_PARAM_OPTIONAL
 		Z_PARAM_LONG(split_length)
-		Z_PARAM_STR(encoding)
+		Z_PARAM_STR_OR_NULL(encoding)
 	ZEND_PARSE_PARAMETERS_END();
 
 	if (split_length <= 0) {
@@ -1943,7 +1943,7 @@ PHP_FUNCTION(mb_strlen)
 	ZEND_PARSE_PARAMETERS_START(1, 2)
 		Z_PARAM_STRING(str, str_len)
 		Z_PARAM_OPTIONAL
-		Z_PARAM_STR(enc_name)
+		Z_PARAM_STR_OR_NULL(enc_name)
 	ZEND_PARSE_PARAMETERS_END();
 
 	string.val = (unsigned char *) str;
@@ -1986,7 +1986,7 @@ PHP_FUNCTION(mb_strpos)
 	zend_string *enc_name = NULL;
 	size_t n;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "ss|lS", (char **)&haystack.val, &haystack.len, (char **)&needle.val, &needle.len, &offset, &enc_name) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "ss|lS!", (char **)&haystack.val, &haystack.len, (char **)&needle.val, &needle.len, &offset, &enc_name) == FAILURE) {
 		RETURN_THROWS();
 	}
 
@@ -2012,7 +2012,7 @@ PHP_FUNCTION(mb_strrpos)
 	zend_string *enc_name = NULL;
 	zend_long offset = 0, n;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "ss|lS", (char **)&haystack.val, &haystack.len, (char **)&needle.val, &needle.len, &offset, &enc_name) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "ss|lS!", (char **)&haystack.val, &haystack.len, (char **)&needle.val, &needle.len, &offset, &enc_name) == FAILURE) {
 		RETURN_THROWS();
 	}
 
@@ -2040,7 +2040,7 @@ PHP_FUNCTION(mb_stripos)
 	zend_string *from_encoding = NULL;
 	const mbfl_encoding *enc;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "ss|lS", (char **)&haystack.val, &haystack.len, (char **)&needle.val, &needle.len, &offset, &from_encoding) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "ss|lS!", (char **)&haystack.val, &haystack.len, (char **)&needle.val, &needle.len, &offset, &from_encoding) == FAILURE) {
 		RETURN_THROWS();
 	}
 
@@ -2069,7 +2069,7 @@ PHP_FUNCTION(mb_strripos)
 	zend_string *from_encoding = NULL;
 	const mbfl_encoding *enc;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "ss|lS", (char **)&haystack.val, &haystack.len, (char **)&needle.val, &needle.len, &offset, &from_encoding) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "ss|lS!", (char **)&haystack.val, &haystack.len, (char **)&needle.val, &needle.len, &offset, &from_encoding) == FAILURE) {
 		RETURN_THROWS();
 	}
 
@@ -2102,7 +2102,7 @@ static void php_mb_strstr_variants(INTERNAL_FUNCTION_PARAMETERS, unsigned int va
 	zend_string *encoding_name = NULL;
 	zend_bool part = 0;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "ss|bS",
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "ss|bS!",
 		(char **)&haystack.val, &haystack.len, (char **)&needle.val, &needle.len,
 		&part, &encoding_name) == FAILURE
 	) {
@@ -2183,7 +2183,7 @@ PHP_FUNCTION(mb_substr_count)
 	mbfl_string haystack, needle;
 	zend_string *enc_name = NULL;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "ss|S", (char **)&haystack.val, &haystack.len, (char **)&needle.val, &needle.len, &enc_name) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "ss|S!", (char **)&haystack.val, &haystack.len, (char **)&needle.val, &needle.len, &enc_name) == FAILURE) {
 		RETURN_THROWS();
 	}
 
@@ -2218,7 +2218,7 @@ PHP_FUNCTION(mb_substr)
 	zend_bool len_is_null = 1;
 	mbfl_string string, result, *ret;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "sl|l!S", &str, &str_len, &from, &len, &len_is_null, &encoding) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "sl|l!S!", &str, &str_len, &from, &len, &len_is_null, &encoding) == FAILURE) {
 		RETURN_THROWS();
 	}
 
@@ -2331,7 +2331,7 @@ PHP_FUNCTION(mb_strwidth)
 	mbfl_string string;
 	zend_string *enc_name = NULL;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "s|S", (char **)&string.val, &string.len, &enc_name) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "s|S!", (char **)&string.val, &string.len, &enc_name) == FAILURE) {
 		RETURN_THROWS();
 	}
 
@@ -2355,7 +2355,7 @@ PHP_FUNCTION(mb_strimwidth)
 	size_t str_len, trimmarker_len;
 	mbfl_string string, result, marker, *ret;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "sll|sS", &str, &str_len, &from, &width, &trimmarker, &trimmarker_len, &encoding) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "sll|sS!", &str, &str_len, &from, &width, &trimmarker, &trimmarker_len, &encoding) == FAILURE) {
 		RETURN_THROWS();
 	}
 
@@ -2583,7 +2583,7 @@ PHP_FUNCTION(mb_convert_encoding)
 		Z_PARAM_STR_OR_ARRAY_HT(input_str, input_ht)
 		Z_PARAM_STR(to_encoding_name)
 		Z_PARAM_OPTIONAL
-		Z_PARAM_STR_OR_ARRAY_HT(from_encodings_str, from_encodings_ht)
+		Z_PARAM_STR_OR_ARRAY_HT_OR_NULL(from_encodings_str, from_encodings_ht)
 	ZEND_PARSE_PARAMETERS_END();
 
 	to_encoding = php_mb_get_encoding(to_encoding_name, 2);
@@ -2868,7 +2868,10 @@ PHP_FUNCTION(mb_encode_mimeheader)
 
 	string.encoding = MBSTRG(current_internal_encoding);
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "s|Sssl", (char **)&string.val, &string.len, &charset_name, &trans_enc_name, &trans_enc_name_len, &linefeed, &linefeed_len, &indent) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "s|S!s!sl",
+		(char **)&string.val, &string.len, &charset_name, &trans_enc_name, &trans_enc_name_len,
+		&linefeed, &linefeed_len, &indent
+	) == FAILURE) {
 		RETURN_THROWS();
 	}
 
@@ -2934,7 +2937,7 @@ PHP_FUNCTION(mb_convert_kana)
 	size_t optstr_len;
 	zend_string *encname = NULL;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "s|sS", (char **)&string.val, &string.len, &optstr, &optstr_len, &encname) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "s|s!S!", (char **)&string.val, &string.len, &optstr, &optstr_len, &encname) == FAILURE) {
 		RETURN_THROWS();
 	}
 
@@ -3241,11 +3244,11 @@ php_mb_numericentity_exec(INTERNAL_FUNCTION_PARAMETERS, int type)
 	mbfl_string string, result, *ret;
 
 	if (type == 0) {
-		if (zend_parse_parameters(ZEND_NUM_ARGS(), "sh|Sb", &str, &str_len, &target_hash, &encoding, &is_hex) == FAILURE) {
+		if (zend_parse_parameters(ZEND_NUM_ARGS(), "sh|S!b", &str, &str_len, &target_hash, &encoding, &is_hex) == FAILURE) {
 			RETURN_THROWS();
 		}
 	} else {
-		if (zend_parse_parameters(ZEND_NUM_ARGS(), "sh|S", &str, &str_len, &target_hash, &encoding) == FAILURE) {
+		if (zend_parse_parameters(ZEND_NUM_ARGS(), "sh|S!", &str, &str_len, &target_hash, &encoding) == FAILURE) {
 			RETURN_THROWS();
 		}
 	}
@@ -3534,7 +3537,7 @@ PHP_FUNCTION(mb_send_mail)
 		body_enc = mbfl_no2encoding(lang->mail_body_encoding);
 	}
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "sss|zS", &to, &to_len, &subject, &subject_len, &message, &message_len, &headers, &extra_cmd) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "sss|z!S!", &to, &to_len, &subject, &subject_len, &message, &message_len, &headers, &extra_cmd) == FAILURE) {
 		RETURN_THROWS();
 	}
 
@@ -3554,8 +3557,8 @@ PHP_FUNCTION(mb_send_mail)
 				str_headers = php_mail_build_headers(Z_ARRVAL_P(headers));
 				break;
 			default:
-				php_error_docref(NULL, E_WARNING, "headers parameter must be string or array");
-				RETURN_FALSE;
+				zend_argument_value_error(4, "must be of type string|array|null, %s given", zend_zval_type_name(headers));
+				RETURN_THROWS();
 		}
 	}
 	if (extra_cmd) {
@@ -4041,8 +4044,8 @@ PHP_FUNCTION(mb_check_encoding)
 
 	ZEND_PARSE_PARAMETERS_START(0, 2)
 		Z_PARAM_OPTIONAL
-		Z_PARAM_STR_OR_ARRAY_HT(input_str, input_ht)
-		Z_PARAM_STR(enc)
+		Z_PARAM_STR_OR_ARRAY_HT_OR_NULL(input_str, input_ht)
+		Z_PARAM_STR_OR_NULL(enc)
 	ZEND_PARSE_PARAMETERS_END();
 
 	encoding = php_mb_get_encoding(enc, 2);
@@ -4128,7 +4131,7 @@ PHP_FUNCTION(mb_ord)
 	ZEND_PARSE_PARAMETERS_START(1, 2)
 		Z_PARAM_STRING(str, str_len)
 		Z_PARAM_OPTIONAL
-		Z_PARAM_STR(enc)
+		Z_PARAM_STR_OR_NULL(enc)
 	ZEND_PARSE_PARAMETERS_END();
 
 	if (str_len == 0) {
@@ -4244,7 +4247,7 @@ PHP_FUNCTION(mb_chr)
 	ZEND_PARSE_PARAMETERS_START(1, 2)
 		Z_PARAM_LONG(cp)
 		Z_PARAM_OPTIONAL
-		Z_PARAM_STR(enc)
+		Z_PARAM_STR_OR_NULL(enc)
 	ZEND_PARSE_PARAMETERS_END();
 
 	ret = php_mb_chr(cp, enc, 2);
@@ -4269,7 +4272,7 @@ PHP_FUNCTION(mb_scrub)
 	ZEND_PARSE_PARAMETERS_START(1, 2)
 		Z_PARAM_STRING(str, str_len)
 		Z_PARAM_OPTIONAL
-		Z_PARAM_STR(enc_name)
+		Z_PARAM_STR_OR_NULL(enc_name)
 	ZEND_PARSE_PARAMETERS_END();
 
 	enc = php_mb_get_encoding(enc_name, 2);
diff --git a/ext/mbstring/mbstring.stub.php b/ext/mbstring/mbstring.stub.php
index 2d88b26ee92b5..6bd6aeae6fe6d 100644
--- a/ext/mbstring/mbstring.stub.php
+++ b/ext/mbstring/mbstring.stub.php
@@ -2,15 +2,15 @@
 
 /** @generate-function-entries */
 
-function mb_language(string $language = UNKNOWN): string|bool {}
+function mb_language(?string $language = null): string|bool {}
 
-function mb_internal_encoding(string $encoding = UNKNOWN): string|bool {}
+function mb_internal_encoding(?string $encoding = null): string|bool {}
 
-function mb_http_input(string $type = UNKNOWN): array|string|false {}
+function mb_http_input(?string $type = null): array|string|false {}
 
-function mb_http_output(string $encoding = UNKNOWN): string|bool {}
+function mb_http_output(?string $encoding = null): string|bool {}
 
-function mb_detect_order(array|string $encoding = UNKNOWN): array|bool {}
+function mb_detect_order(array|string|null $encoding = null): array|bool {}
 
 function mb_substitute_character(string|int|null $substitute_character = null): string|int|bool {}
 
@@ -20,37 +20,37 @@ function mb_parse_str(string $encoded_string, &$result): bool {}
 
 function mb_output_handler(string $contents, int $status): string {}
 
-function mb_str_split(string $str, int $split_length = 1, string $encoding = UNKNOWN): array {}
+function mb_str_split(string $str, int $split_length = 1, ?string $encoding = null): array {}
 
-function mb_strlen(string $str, string $encoding = UNKNOWN): int {}
+function mb_strlen(string $str, ?string $encoding = null): int {}
 
-function mb_strpos(string $haystack, string $needle, int $offset = 0, string $encoding = UNKNOWN): int|false {}
+function mb_strpos(string $haystack, string $needle, int $offset = 0, ?string $encoding = null): int|false {}
 
-function mb_strrpos(string $haystack, string $needle, int $offset = 0, string $encoding = UNKNOWN): int|false {}
+function mb_strrpos(string $haystack, string $needle, int $offset = 0, ?string $encoding = null): int|false {}
 
-function mb_stripos(string $haystack, string $needle, int $offset = 0, string $encoding = UNKNOWN): int|false {}
+function mb_stripos(string $haystack, string $needle, int $offset = 0, ?string $encoding = null): int|false {}
 
-function mb_strripos(string $haystack, string $needle, int $offset = 0, string $encoding = UNKNOWN): int|false {}
+function mb_strripos(string $haystack, string $needle, int $offset = 0, ?string $encoding = null): int|false {}
 
-function mb_strstr(string $haystack, string $needle, bool $part = false, string $encoding = UNKNOWN): string|false {}
+function mb_strstr(string $haystack, string $needle, bool $part = false, ?string $encoding = null): string|false {}
 
-function mb_strrchr(string $haystack, string $needle, bool $part = false, string $encoding = UNKNOWN): string|false {}
+function mb_strrchr(string $haystack, string $needle, bool $part = false, ?string $encoding = null): string|false {}
 
-function mb_stristr(string $haystack, string $needle, bool $part = false, string $encoding = UNKNOWN): string|false {}
+function mb_stristr(string $haystack, string $needle, bool $part = false, ?string $encoding = null): string|false {}
 
-function mb_strrichr(string $haystack, string $needle, bool $part = false, string $encoding = UNKNOWN): string|false {}
+function mb_strrichr(string $haystack, string $needle, bool $part = false, ?string $encoding = null): string|false {}
 
-function mb_substr_count(string $haystack, string $needle, string $encoding = UNKNOWN): int {}
+function mb_substr_count(string $haystack, string $needle, ?string $encoding = null): int {}
 
-function mb_substr(string $str, int $start, ?int $length = null, string $encoding = UNKNOWN): string {}
+function mb_substr(string $str, int $start, ?int $length = null, ?string $encoding = null): string {}
 
-function mb_strcut(string $str, int $start, ?int $length = null, string $encoding = UNKNOWN): string|false {}
+function mb_strcut(string $str, int $start, ?int $length = null, ?string $encoding = null): string|false {}
 
-function mb_strwidth(string $str, string $encoding = UNKNOWN): int {}
+function mb_strwidth(string $str, ?string $encoding = null): int {}
 
-function mb_strimwidth(string $str, int $start, int $width, string $trim_marker = UNKNOWN, string $encoding = UNKNOWN): string {}
+function mb_strimwidth(string $str, int $start, int $width, string $trim_marker = "", ?string $encoding = null): string {}
 
-function mb_convert_encoding(array|string $str, string $to, array|string $from = UNKNOWN): array|string|false {}
+function mb_convert_encoding(array|string $str, string $to, array|string|null $from = null): array|string|false {}
 
 function mb_convert_case(string $source_string, int $mode, ?string $encoding = null): string {}
 
@@ -64,54 +64,55 @@ function mb_list_encodings(): array {}
 
 function mb_encoding_aliases(string $encoding): array {}
 
-function mb_encode_mimeheader(string $str, string $charset = UNKNOWN, string $transfer = UNKNOWN, string $linefeed = UNKNOWN, int $indent = 0): string {}
+function mb_encode_mimeheader(string $str, ?string $charset = null, ?string $transfer = null, string $linefeed = "\r\n", int $indent = 0): string {}
 
 function mb_decode_mimeheader(string $string): string {}
 
-function mb_convert_kana(string $str, string $option = UNKNOWN, string $encoding = UNKNOWN): string {}
+function mb_convert_kana(string $str, string $option = "KV", ?string $encoding = null): string {}
 
 function mb_convert_variables(string $to, array|string $from, &$var, &...$vars): string|false {}
 
-function mb_encode_numericentity(string $string, array $convmap, string $encoding = UNKNOWN, bool $is_hex = false): string {}
+function mb_encode_numericentity(string $string, array $convmap, ?string $encoding = null, bool $is_hex = false): string {}
 
-function mb_decode_numericentity(string $string, array $convmap, string $encoding = UNKNOWN): string {}
+function mb_decode_numericentity(string $string, array $convmap, ?string $encoding = null): string {}
 
-function mb_send_mail(string $to, string $subject, string $message, $additional_headers = UNKNOWN, string $additional_parameters = UNKNOWN): bool {}
+/** @param string|array|null $additional_headers */
+function mb_send_mail(string $to, string $subject, string $message, $additional_headers = null, ?string $additional_parameters = null): bool {}
 
-function mb_get_info(string $type = UNKNOWN): array|string|int|false {}
+function mb_get_info(string $type = "all"): array|string|int|false {}
 
-function mb_check_encoding(array|string $var = UNKNOWN, string $encoding = UNKNOWN): bool {}
+function mb_check_encoding(array|string|null $var = null, ?string $encoding = null): bool {}
 
-function mb_scrub(string $str, string $encoding = UNKNOWN): string {}
+function mb_scrub(string $str, ?string $encoding = null): string {}
 
-function mb_ord(string $str, string $encoding = UNKNOWN): int|false {}
+function mb_ord(string $str, ?string $encoding = null): int|false {}
 
-function mb_chr(int $cp, string $encoding = UNKNOWN): string|false {}
+function mb_chr(int $cp, ?string $encoding = null): string|false {}
 
 #ifdef HAVE_MBREGEX
-function mb_regex_encoding(string $encoding = UNKNOWN): string|bool {}
+function mb_regex_encoding(?string $encoding = null): string|bool {}
 
-function mb_ereg(string $pattern, string $string, &$registers = UNKNOWN): int|false {}
+function mb_ereg(string $pattern, string $string, &$registers = null): int|false {}
 
-function mb_eregi(string $pattern, string $string, &$registers = UNKNOWN): int|false {}
+function mb_eregi(string $pattern, string $string, &$registers = null): int|false {}
 
-function mb_ereg_replace(string $pattern, string $replacement, string $string, string $option = UNKNOWN): string|false|null {}
+function mb_ereg_replace(string $pattern, string $replacement, string $string, ?string $option = null): string|false|null {}
 
-function mb_eregi_replace(string $pattern, string $replacement, string $string, string $option = UNKNOWN): string|false|null {}
+function mb_eregi_replace(string $pattern, string $replacement, string $string, ?string $option = null): string|false|null {}
 
-function mb_ereg_replace_callback(string $pattern, callable $callback, string $string, string $option = UNKNOWN): string|false|null {}
+function mb_ereg_replace_callback(string $pattern, callable $callback, string $string, ?string $option = null): string|false|null {}
 
 function mb_split(string $pattern, string $string, int $limit = -1): array|false {}
 
-function mb_ereg_match(string $pattern, string $string, string $option = UNKNOWN): bool {}
+function mb_ereg_match(string $pattern, string $string, ?string $option = null): bool {}
 
-function mb_ereg_search(string $pattern = UNKNOWN, string $option = UNKNOWN): bool {}
+function mb_ereg_search(?string $pattern = null, ?string $option = null): bool {}
 
-function mb_ereg_search_pos(string $pattern = UNKNOWN, string $option = UNKNOWN): array|false {}
+function mb_ereg_search_pos(?string $pattern = null, ?string $option = null): array|false {}
 
-function mb_ereg_search_regs(string $pattern = UNKNOWN, string $option = UNKNOWN): array|false {}
+function mb_ereg_search_regs(?string $pattern = null, ?string $option = null): array|false {}
 
-function mb_ereg_search_init(string $string, string $pattern = UNKNOWN, string $option = UNKNOWN): bool {}
+function mb_ereg_search_init(string $string, ?string $pattern = null, ?string $option = null): bool {}
 
 function mb_ereg_search_getregs(): array|false {}
 
@@ -119,5 +120,5 @@ function mb_ereg_search_getpos(): int {}
 
 function mb_ereg_search_setpos(int $position): bool {}
 
-function mb_regex_set_options(string $options = UNKNOWN): string {}
+function mb_regex_set_options(?string $options = null): string {}
 #endif
diff --git a/ext/mbstring/mbstring_arginfo.h b/ext/mbstring/mbstring_arginfo.h
index 74be402d31812..66fb381ed4f44 100644
--- a/ext/mbstring/mbstring_arginfo.h
+++ b/ext/mbstring/mbstring_arginfo.h
@@ -1,22 +1,22 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: fad341194e6c8e180b17f9ba168c062a13db2977 */
+ * Stub hash: 282413dbcb1b92e1efadf4352f443692076aea59 */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mb_language, 0, 0, MAY_BE_STRING|MAY_BE_BOOL)
-	ZEND_ARG_TYPE_INFO(0, language, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, language, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mb_internal_encoding, 0, 0, MAY_BE_STRING|MAY_BE_BOOL)
-	ZEND_ARG_TYPE_INFO(0, encoding, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, encoding, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mb_http_input, 0, 0, MAY_BE_ARRAY|MAY_BE_STRING|MAY_BE_FALSE)
-	ZEND_ARG_TYPE_INFO(0, type, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, type, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 #define arginfo_mb_http_output arginfo_mb_internal_encoding
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mb_detect_order, 0, 0, MAY_BE_ARRAY|MAY_BE_BOOL)
-	ZEND_ARG_TYPE_MASK(0, encoding, MAY_BE_ARRAY|MAY_BE_STRING, NULL)
+	ZEND_ARG_TYPE_MASK(0, encoding, MAY_BE_ARRAY|MAY_BE_STRING|MAY_BE_NULL, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mb_substitute_character, 0, 0, MAY_BE_STRING|MAY_BE_LONG|MAY_BE_BOOL)
@@ -40,19 +40,19 @@ ZEND_END_ARG_INFO()
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_mb_str_split, 0, 1, IS_ARRAY, 0)
 	ZEND_ARG_TYPE_INFO(0, str, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, split_length, IS_LONG, 0, "1")
-	ZEND_ARG_TYPE_INFO(0, encoding, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, encoding, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_mb_strlen, 0, 1, IS_LONG, 0)
 	ZEND_ARG_TYPE_INFO(0, str, IS_STRING, 0)
-	ZEND_ARG_TYPE_INFO(0, encoding, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, encoding, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mb_strpos, 0, 2, MAY_BE_LONG|MAY_BE_FALSE)
 	ZEND_ARG_TYPE_INFO(0, haystack, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, needle, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, offset, IS_LONG, 0, "0")
-	ZEND_ARG_TYPE_INFO(0, encoding, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, encoding, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 #define arginfo_mb_strrpos arginfo_mb_strpos
@@ -65,7 +65,7 @@ ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mb_strstr, 0, 2, MAY_BE_STRING|M
 	ZEND_ARG_TYPE_INFO(0, haystack, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, needle, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, part, _IS_BOOL, 0, "false")
-	ZEND_ARG_TYPE_INFO(0, encoding, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, encoding, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 #define arginfo_mb_strrchr arginfo_mb_strstr
@@ -77,21 +77,21 @@ ZEND_END_ARG_INFO()
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_mb_substr_count, 0, 2, IS_LONG, 0)
 	ZEND_ARG_TYPE_INFO(0, haystack, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, needle, IS_STRING, 0)
-	ZEND_ARG_TYPE_INFO(0, encoding, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, encoding, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_mb_substr, 0, 2, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, str, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, start, IS_LONG, 0)
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, length, IS_LONG, 1, "null")
-	ZEND_ARG_TYPE_INFO(0, encoding, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, encoding, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mb_strcut, 0, 2, MAY_BE_STRING|MAY_BE_FALSE)
 	ZEND_ARG_TYPE_INFO(0, str, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, start, IS_LONG, 0)
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, length, IS_LONG, 1, "null")
-	ZEND_ARG_TYPE_INFO(0, encoding, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, encoding, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 #define arginfo_mb_strwidth arginfo_mb_strlen
@@ -100,14 +100,14 @@ ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_mb_strimwidth, 0, 3, IS_STRING,
 	ZEND_ARG_TYPE_INFO(0, str, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, start, IS_LONG, 0)
 	ZEND_ARG_TYPE_INFO(0, width, IS_LONG, 0)
-	ZEND_ARG_TYPE_INFO(0, trim_marker, IS_STRING, 0)
-	ZEND_ARG_TYPE_INFO(0, encoding, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, trim_marker, IS_STRING, 0, "\"\"")
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, encoding, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mb_convert_encoding, 0, 2, MAY_BE_ARRAY|MAY_BE_STRING|MAY_BE_FALSE)
 	ZEND_ARG_TYPE_MASK(0, str, MAY_BE_ARRAY|MAY_BE_STRING, NULL)
 	ZEND_ARG_TYPE_INFO(0, to, IS_STRING, 0)
-	ZEND_ARG_TYPE_MASK(0, from, MAY_BE_ARRAY|MAY_BE_STRING, NULL)
+	ZEND_ARG_TYPE_MASK(0, from, MAY_BE_ARRAY|MAY_BE_STRING|MAY_BE_NULL, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_mb_convert_case, 0, 2, IS_STRING, 0)
@@ -138,9 +138,9 @@ ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_mb_encode_mimeheader, 0, 1, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, str, IS_STRING, 0)
-	ZEND_ARG_TYPE_INFO(0, charset, IS_STRING, 0)
-	ZEND_ARG_TYPE_INFO(0, transfer, IS_STRING, 0)
-	ZEND_ARG_TYPE_INFO(0, linefeed, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, charset, IS_STRING, 1, "null")
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, transfer, IS_STRING, 1, "null")
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, linefeed, IS_STRING, 0, "\"\\r\\n\"")
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, indent, IS_LONG, 0, "0")
 ZEND_END_ARG_INFO()
 
@@ -150,8 +150,8 @@ ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_mb_convert_kana, 0, 1, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, str, IS_STRING, 0)
-	ZEND_ARG_TYPE_INFO(0, option, IS_STRING, 0)
-	ZEND_ARG_TYPE_INFO(0, encoding, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, option, IS_STRING, 0, "\"KV\"")
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, encoding, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mb_convert_variables, 0, 3, MAY_BE_STRING|MAY_BE_FALSE)
@@ -164,51 +164,51 @@ ZEND_END_ARG_INFO()
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_mb_encode_numericentity, 0, 2, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, string, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, convmap, IS_ARRAY, 0)
-	ZEND_ARG_TYPE_INFO(0, encoding, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, encoding, IS_STRING, 1, "null")
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, is_hex, _IS_BOOL, 0, "false")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_mb_decode_numericentity, 0, 2, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, string, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, convmap, IS_ARRAY, 0)
-	ZEND_ARG_TYPE_INFO(0, encoding, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, encoding, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_mb_send_mail, 0, 3, _IS_BOOL, 0)
 	ZEND_ARG_TYPE_INFO(0, to, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, subject, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, message, IS_STRING, 0)
-	ZEND_ARG_INFO(0, additional_headers)
-	ZEND_ARG_TYPE_INFO(0, additional_parameters, IS_STRING, 0)
+	ZEND_ARG_INFO_WITH_DEFAULT_VALUE(0, additional_headers, "null")
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, additional_parameters, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mb_get_info, 0, 0, MAY_BE_ARRAY|MAY_BE_STRING|MAY_BE_LONG|MAY_BE_FALSE)
-	ZEND_ARG_TYPE_INFO(0, type, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, type, IS_STRING, 0, "\"all\"")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_mb_check_encoding, 0, 0, _IS_BOOL, 0)
-	ZEND_ARG_TYPE_MASK(0, var, MAY_BE_ARRAY|MAY_BE_STRING, NULL)
-	ZEND_ARG_TYPE_INFO(0, encoding, IS_STRING, 0)
+	ZEND_ARG_TYPE_MASK(0, var, MAY_BE_ARRAY|MAY_BE_STRING|MAY_BE_NULL, "null")
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, encoding, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_mb_scrub, 0, 1, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, str, IS_STRING, 0)
-	ZEND_ARG_TYPE_INFO(0, encoding, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, encoding, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mb_ord, 0, 1, MAY_BE_LONG|MAY_BE_FALSE)
 	ZEND_ARG_TYPE_INFO(0, str, IS_STRING, 0)
-	ZEND_ARG_TYPE_INFO(0, encoding, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, encoding, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mb_chr, 0, 1, MAY_BE_STRING|MAY_BE_FALSE)
 	ZEND_ARG_TYPE_INFO(0, cp, IS_LONG, 0)
-	ZEND_ARG_TYPE_INFO(0, encoding, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, encoding, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
 #if defined(HAVE_MBREGEX)
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mb_regex_encoding, 0, 0, MAY_BE_STRING|MAY_BE_BOOL)
-	ZEND_ARG_TYPE_INFO(0, encoding, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, encoding, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 #endif
 
@@ -216,7 +216,7 @@ ZEND_END_ARG_INFO()
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mb_ereg, 0, 2, MAY_BE_LONG|MAY_BE_FALSE)
 	ZEND_ARG_TYPE_INFO(0, pattern, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, string, IS_STRING, 0)
-	ZEND_ARG_INFO(1, registers)
+	ZEND_ARG_INFO_WITH_DEFAULT_VALUE(1, registers, "null")
 ZEND_END_ARG_INFO()
 #endif
 
@@ -229,7 +229,7 @@ ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mb_ereg_replace, 0, 3, MAY_BE_ST
 	ZEND_ARG_TYPE_INFO(0, pattern, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, replacement, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, string, IS_STRING, 0)
-	ZEND_ARG_TYPE_INFO(0, option, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, option, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 #endif
 
@@ -242,7 +242,7 @@ ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mb_ereg_replace_callback, 0, 3,
 	ZEND_ARG_TYPE_INFO(0, pattern, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, callback, IS_CALLABLE, 0)
 	ZEND_ARG_TYPE_INFO(0, string, IS_STRING, 0)
-	ZEND_ARG_TYPE_INFO(0, option, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, option, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 #endif
 
@@ -258,21 +258,21 @@ ZEND_END_ARG_INFO()
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_mb_ereg_match, 0, 2, _IS_BOOL, 0)
 	ZEND_ARG_TYPE_INFO(0, pattern, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, string, IS_STRING, 0)
-	ZEND_ARG_TYPE_INFO(0, option, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, option, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 #endif
 
 #if defined(HAVE_MBREGEX)
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_mb_ereg_search, 0, 0, _IS_BOOL, 0)
-	ZEND_ARG_TYPE_INFO(0, pattern, IS_STRING, 0)
-	ZEND_ARG_TYPE_INFO(0, option, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, pattern, IS_STRING, 1, "null")
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, option, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 #endif
 
 #if defined(HAVE_MBREGEX)
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mb_ereg_search_pos, 0, 0, MAY_BE_ARRAY|MAY_BE_FALSE)
-	ZEND_ARG_TYPE_INFO(0, pattern, IS_STRING, 0)
-	ZEND_ARG_TYPE_INFO(0, option, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, pattern, IS_STRING, 1, "null")
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, option, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 #endif
 
@@ -283,8 +283,8 @@ ZEND_END_ARG_INFO()
 #if defined(HAVE_MBREGEX)
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_mb_ereg_search_init, 0, 1, _IS_BOOL, 0)
 	ZEND_ARG_TYPE_INFO(0, string, IS_STRING, 0)
-	ZEND_ARG_TYPE_INFO(0, pattern, IS_STRING, 0)
-	ZEND_ARG_TYPE_INFO(0, option, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, pattern, IS_STRING, 1, "null")
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, option, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 #endif
 
@@ -306,7 +306,7 @@ ZEND_END_ARG_INFO()
 
 #if defined(HAVE_MBREGEX)
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_mb_regex_set_options, 0, 0, IS_STRING, 0)
-	ZEND_ARG_TYPE_INFO(0, options, IS_STRING, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, options, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 #endif
 
diff --git a/ext/mbstring/php_mbregex.c b/ext/mbstring/php_mbregex.c
index a797efbf7b7a9..85309e7cfdb8b 100644
--- a/ext/mbstring/php_mbregex.c
+++ b/ext/mbstring/php_mbregex.c
@@ -852,7 +852,7 @@ PHP_FUNCTION(mb_regex_encoding)
 	char *encoding = NULL;
 	size_t encoding_len;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|s", &encoding, &encoding_len) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|s!", &encoding, &encoding_len) == FAILURE) {
 		RETURN_THROWS();
 	}
 
@@ -1030,7 +1030,7 @@ static void _php_mb_regex_ereg_replace_exec(INTERNAL_FUNCTION_PARAMETERS, OnigOp
 		size_t option_str_len = 0;
 
 		if (!is_callable) {
-			if (zend_parse_parameters(ZEND_NUM_ARGS(), "sss|s",
+			if (zend_parse_parameters(ZEND_NUM_ARGS(), "sss|s!",
 						&arg_pattern, &arg_pattern_len,
 						&replace, &replace_len,
 						&string, &string_len,
@@ -1038,7 +1038,7 @@ static void _php_mb_regex_ereg_replace_exec(INTERNAL_FUNCTION_PARAMETERS, OnigOp
 				RETURN_THROWS();
 			}
 		} else {
-			if (zend_parse_parameters(ZEND_NUM_ARGS(), "sfs|s",
+			if (zend_parse_parameters(ZEND_NUM_ARGS(), "sfs|s!",
 						&arg_pattern, &arg_pattern_len,
 						&arg_replace_fci, &arg_replace_fci_cache,
 						&string, &string_len,
@@ -1297,7 +1297,7 @@ PHP_FUNCTION(mb_ereg_match)
 		char *option_str = NULL;
 		size_t option_str_len = 0;
 
-		if (zend_parse_parameters(ZEND_NUM_ARGS(), "ss|s",
+		if (zend_parse_parameters(ZEND_NUM_ARGS(), "ss|s!",
 		                          &arg_pattern, &arg_pattern_len, &string, &string_len,
 		                          &option_str, &option_str_len)==FAILURE) {
 			RETURN_THROWS();
@@ -1340,8 +1340,7 @@ PHP_FUNCTION(mb_ereg_match)
 
 /* regex search */
 /* {{{ _php_mb_regex_ereg_search_exec */
-static void
-_php_mb_regex_ereg_search_exec(INTERNAL_FUNCTION_PARAMETERS, int mode)
+static void _php_mb_regex_ereg_search_exec(INTERNAL_FUNCTION_PARAMETERS, int mode)
 {
 	char *arg_pattern = NULL, *arg_options = NULL;
 	size_t arg_pattern_len, arg_options_len;
@@ -1353,7 +1352,7 @@ _php_mb_regex_ereg_search_exec(INTERNAL_FUNCTION_PARAMETERS, int mode)
 	OnigUChar *str;
 	OnigSyntaxType *syntax;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|ss", &arg_pattern, &arg_pattern_len, &arg_options, &arg_options_len) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|s!s!", &arg_pattern, &arg_pattern_len, &arg_options, &arg_options_len) == FAILURE) {
 		RETURN_THROWS();
 	}
 
@@ -1485,24 +1484,24 @@ PHP_FUNCTION(mb_ereg_search_init)
 	OnigSyntaxType *syntax = NULL;
 	OnigOptionType option;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "S|ss", &arg_str, &arg_pattern, &arg_pattern_len, &arg_options, &arg_options_len) == FAILURE) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "S|s!s!", &arg_str, &arg_pattern, &arg_pattern_len, &arg_options, &arg_options_len) == FAILURE) {
 		RETURN_THROWS();
 	}
 
-	if (ZEND_NUM_ARGS() > 1 && arg_pattern_len == 0) {
+	if (arg_pattern && arg_pattern_len == 0) {
 		php_error_docref(NULL, E_WARNING, "Empty pattern");
 		RETURN_FALSE;
 	}
 
-	option = MBREX(regex_default_options);
-	syntax = MBREX(regex_default_syntax);
-
-	if (ZEND_NUM_ARGS() == 3) {
+	if (arg_options) {
 		option = 0;
 		_php_mb_regex_init_options(arg_options, arg_options_len, &option, &syntax, NULL);
+	} else {
+		option = MBREX(regex_default_options);
+		syntax = MBREX(regex_default_syntax);
 	}
 
-	if (ZEND_NUM_ARGS() > 1) {
+	if (arg_pattern) {
 		/* create regex pattern buffer */
 		if ((MBREX(search_re) = php_mbregex_compile_pattern(arg_pattern, arg_pattern_len, option, syntax)) == NULL) {
 			RETURN_FALSE;
@@ -1515,11 +1514,7 @@ PHP_FUNCTION(mb_ereg_search_init)
 
 	ZVAL_STR_COPY(&MBREX(search_str), arg_str);
 
-	if (php_mb_check_encoding(
-	ZSTR_VAL(arg_str),
-	ZSTR_LEN(arg_str),
-	php_mb_regex_get_mbctype_encoding()
-	)) {
+	if (php_mb_check_encoding(ZSTR_VAL(arg_str), ZSTR_LEN(arg_str), php_mb_regex_get_mbctype_encoding())) {
 		MBREX(search_pos) = 0;
 		RETVAL_TRUE;
 	} else {
@@ -1635,7 +1630,7 @@ PHP_FUNCTION(mb_regex_set_options)
 	size_t string_len;
 	char buf[16];
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|s",
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|s!",
 	                          &string, &string_len) == FAILURE) {
 		RETURN_THROWS();
 	}