diff --git a/NEWS b/NEWS
index b815dd441ea2c..e6c3ea5522f97 100644
--- a/NEWS
+++ b/NEWS
@@ -30,6 +30,8 @@ Intl:
   . Added IntlDateFormatter::PATTERN constant. (David Carlier)
   . Fixed Numberformatter::__construct when the locale is invalid, now
     throws an exception. (David Carlier)
+  . Added NumberFormatter::ROUND_TOWARD_ZERO and ::ROUND_AWAY_FROM_ZERO as
+    aliases for ::ROUND_DOWN and ::ROUND_UP. (Jorg Sowa)
 
 MBString:
   . Added mb_trim, mb_ltrim and mb_rtrim. (Yuya Hamada)
@@ -106,7 +108,8 @@ Standard:
     (nielsdos)
   . Removed the deprecated inet_ntoa call support. (David Carlier)
   . Cast large floats that are within int range to int in number_format so
-    the precision is not lost. (Marc Bennewitz) 
+    the precision is not lost. (Marc Bennewitz)
+  . Add support for 4 new rounding modes to the round() function. (Jorg Sowa)
 
 XML:
   . Added XML_OPTION_PARSE_HUGE parser option. (nielsdos)
diff --git a/UPGRADING b/UPGRADING
index 27504fc5c9850..f202e8cb5399f 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -216,6 +216,11 @@ PHP 8.4 UPGRADE NOTES
 - Intl:
   . IntlDateFormatter::__construct() throws a ValueError if the locale is invalid.
   . NumberFormatter::__construct() throws a ValueError if the locale is invalid.
+  . NumberFormatter::ROUND_TOWARD_ZERO and NumberFormatter::ROUND_AWAY_FROM_ZERO
+    have been added as aliases for NumberFormatter::ROUND_DOWN and
+    NumberFormatter::ROUND_UP to be consistent with the new PHP_ROUND_* modes.
+
+    RFC: https://wiki.php.net/rfc/new_rounding_modes_to_round_function
 
 - MBString:
   . The behavior of mb_strcut is more consistent now on invalid UTF-8 and UTF-16
@@ -250,6 +255,10 @@ PHP 8.4 UPGRADE NOTES
     has been increased from '10' to '12'.
 
     RFC: https://wiki.php.net/rfc/bcrypt_cost_2023
+  . Four new modes have been added to the round() function: PHP_ROUND_CEILING,
+    PHP_ROUND_FLOOR, PHP_ROUND_TOWARD_ZERO, PHP_ROUND_AWAY_FROM_ZERO.
+
+    RFC: https://wiki.php.net/rfc/new_rounding_modes_to_round_function
 
 ========================================
 6. New Functions
diff --git a/ext/intl/formatter/formatter.stub.php b/ext/intl/formatter/formatter.stub.php
index 430c02bd60a67..4e31b7dc22c01 100644
--- a/ext/intl/formatter/formatter.stub.php
+++ b/ext/intl/formatter/formatter.stub.php
@@ -44,6 +44,10 @@ class NumberFormatter
     public const int ROUND_DOWN = UNKNOWN;
     /** @cvalue UNUM_ROUND_UP */
     public const int ROUND_UP = UNKNOWN;
+    /** @cvalue UNUM_ROUND_DOWN */
+    public const int ROUND_TOWARD_ZERO = UNKNOWN;
+    /** @cvalue UNUM_ROUND_UP */
+    public const int ROUND_AWAY_FROM_ZERO = UNKNOWN;
     /** @cvalue UNUM_ROUND_HALFEVEN */
     public const int ROUND_HALFEVEN = UNKNOWN;
     /** @cvalue UNUM_ROUND_HALFDOWN */
diff --git a/ext/intl/formatter/formatter_arginfo.h b/ext/intl/formatter/formatter_arginfo.h
index 8d406350aef5f..fc50aadeb9496 100644
--- a/ext/intl/formatter/formatter_arginfo.h
+++ b/ext/intl/formatter/formatter_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 6178ab530b85aca5c90fb7369c5019bb5cbfe8a7 */
+ * Stub hash: 5d5421c72894a77894872efdf060ec058d275c13 */
 
 ZEND_BEGIN_ARG_INFO_EX(arginfo_class_NumberFormatter___construct, 0, 0, 2)
 	ZEND_ARG_TYPE_INFO(0, locale, IS_STRING, 0)
@@ -226,6 +226,18 @@ static zend_class_entry *register_class_NumberFormatter(void)
 	zend_declare_typed_class_constant(class_entry, const_ROUND_UP_name, &const_ROUND_UP_value, ZEND_ACC_PUBLIC, NULL, (zend_type) ZEND_TYPE_INIT_MASK(MAY_BE_LONG));
 	zend_string_release(const_ROUND_UP_name);
 
+	zval const_ROUND_TOWARD_ZERO_value;
+	ZVAL_LONG(&const_ROUND_TOWARD_ZERO_value, UNUM_ROUND_DOWN);
+	zend_string *const_ROUND_TOWARD_ZERO_name = zend_string_init_interned("ROUND_TOWARD_ZERO", sizeof("ROUND_TOWARD_ZERO") - 1, 1);
+	zend_declare_typed_class_constant(class_entry, const_ROUND_TOWARD_ZERO_name, &const_ROUND_TOWARD_ZERO_value, ZEND_ACC_PUBLIC, NULL, (zend_type) ZEND_TYPE_INIT_MASK(MAY_BE_LONG));
+	zend_string_release(const_ROUND_TOWARD_ZERO_name);
+
+	zval const_ROUND_AWAY_FROM_ZERO_value;
+	ZVAL_LONG(&const_ROUND_AWAY_FROM_ZERO_value, UNUM_ROUND_UP);
+	zend_string *const_ROUND_AWAY_FROM_ZERO_name = zend_string_init_interned("ROUND_AWAY_FROM_ZERO", sizeof("ROUND_AWAY_FROM_ZERO") - 1, 1);
+	zend_declare_typed_class_constant(class_entry, const_ROUND_AWAY_FROM_ZERO_name, &const_ROUND_AWAY_FROM_ZERO_value, ZEND_ACC_PUBLIC, NULL, (zend_type) ZEND_TYPE_INIT_MASK(MAY_BE_LONG));
+	zend_string_release(const_ROUND_AWAY_FROM_ZERO_name);
+
 	zval const_ROUND_HALFEVEN_value;
 	ZVAL_LONG(&const_ROUND_HALFEVEN_value, UNUM_ROUND_HALFEVEN);
 	zend_string *const_ROUND_HALFEVEN_name = zend_string_init_interned("ROUND_HALFEVEN", sizeof("ROUND_HALFEVEN") - 1, 1);
diff --git a/ext/intl/tests/formatter/rounding_modes.phpt b/ext/intl/tests/formatter/rounding_modes.phpt
new file mode 100644
index 0000000000000..9edde4ac7fbd6
--- /dev/null
+++ b/ext/intl/tests/formatter/rounding_modes.phpt
@@ -0,0 +1,33 @@
+--TEST--
+NumberFormatter: rounding modes
+--EXTENSIONS--
+intl
+--FILE--
+<?php
+ini_set("intl.error_level", E_WARNING);
+
+var_dump(NumberFormatter::ROUND_CEILING);
+var_dump(NumberFormatter::ROUND_FLOOR);
+var_dump(NumberFormatter::ROUND_DOWN);
+var_dump(NumberFormatter::ROUND_TOWARD_ZERO);
+var_dump(NumberFormatter::ROUND_UP);
+var_dump(NumberFormatter::ROUND_AWAY_FROM_ZERO);
+var_dump(NumberFormatter::ROUND_HALFEVEN);
+var_dump(NumberFormatter::ROUND_HALFDOWN);
+var_dump(NumberFormatter::ROUND_HALFUP);
+
+var_dump(NumberFormatter::ROUND_DOWN === NumberFormatter::ROUND_TOWARD_ZERO);
+var_dump(NumberFormatter::ROUND_UP === NumberFormatter::ROUND_AWAY_FROM_ZERO);
+?>
+--EXPECTF--
+int(0)
+int(1)
+int(2)
+int(2)
+int(3)
+int(3)
+int(4)
+int(5)
+int(6)
+bool(true)
+bool(true)
diff --git a/ext/standard/basic_functions.stub.php b/ext/standard/basic_functions.stub.php
index 8592d7c0b8810..851fc0ade4191 100755
--- a/ext/standard/basic_functions.stub.php
+++ b/ext/standard/basic_functions.stub.php
@@ -375,6 +375,26 @@
  * @cvalue PHP_ROUND_HALF_ODD
  */
 const PHP_ROUND_HALF_ODD = UNKNOWN;
+/**
+ * @var int
+ * @cvalue PHP_ROUND_CEILING
+ */
+const PHP_ROUND_CEILING = UNKNOWN;
+/**
+ * @var int
+ * @cvalue PHP_ROUND_FLOOR
+ */
+const PHP_ROUND_FLOOR = UNKNOWN;
+/**
+ * @var int
+ * @cvalue PHP_ROUND_TOWARD_ZERO
+ */
+const PHP_ROUND_TOWARD_ZERO = UNKNOWN;
+/**
+ * @var int
+ * @cvalue PHP_ROUND_AWAY_FROM_ZERO
+ */
+const PHP_ROUND_AWAY_FROM_ZERO = UNKNOWN;
 
 /* crypt.c */
 
diff --git a/ext/standard/basic_functions_arginfo.h b/ext/standard/basic_functions_arginfo.h
index 48202e78079ac..966ab01b0f73b 100644
--- a/ext/standard/basic_functions_arginfo.h
+++ b/ext/standard/basic_functions_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: c9edbe45bb7a2b00b413fb3c56683bb8377a725f */
+ * Stub hash: 7b14f7e9eb57bc1f2aff20097fddd14d1fe0494e */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_set_time_limit, 0, 1, _IS_BOOL, 0)
 	ZEND_ARG_TYPE_INFO(0, seconds, IS_LONG, 0)
@@ -3569,6 +3569,10 @@ static void register_basic_functions_symbols(int module_number)
 	REGISTER_LONG_CONSTANT("PHP_ROUND_HALF_DOWN", PHP_ROUND_HALF_DOWN, CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("PHP_ROUND_HALF_EVEN", PHP_ROUND_HALF_EVEN, CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("PHP_ROUND_HALF_ODD", PHP_ROUND_HALF_ODD, CONST_PERSISTENT);
+	REGISTER_LONG_CONSTANT("PHP_ROUND_CEILING", PHP_ROUND_CEILING, CONST_PERSISTENT);
+	REGISTER_LONG_CONSTANT("PHP_ROUND_FLOOR", PHP_ROUND_FLOOR, CONST_PERSISTENT);
+	REGISTER_LONG_CONSTANT("PHP_ROUND_TOWARD_ZERO", PHP_ROUND_TOWARD_ZERO, CONST_PERSISTENT);
+	REGISTER_LONG_CONSTANT("PHP_ROUND_AWAY_FROM_ZERO", PHP_ROUND_AWAY_FROM_ZERO, CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("CRYPT_SALT_LENGTH", PHP_MAX_SALT_LEN, CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("CRYPT_STD_DES", 1, CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("CRYPT_EXT_DES", 1, CONST_PERSISTENT);
diff --git a/ext/standard/math.c b/ext/standard/math.c
index 377c573033f69..4ee5f9482909d 100644
--- a/ext/standard/math.c
+++ b/ext/standard/math.c
@@ -126,6 +126,30 @@ static inline double php_round_helper(double value, int mode) {
 
 			return integral;
 
+		case PHP_ROUND_CEILING:
+			if (value > 0.0 && fractional > 0.0) {
+				return integral + 1.0;
+			}
+
+			return integral;
+
+		case PHP_ROUND_FLOOR:
+			if (value < 0.0 && fractional > 0.0) {
+				return integral - 1.0;
+			}
+
+			return integral;
+
+		case PHP_ROUND_TOWARD_ZERO:
+			return integral;
+
+		case PHP_ROUND_AWAY_FROM_ZERO:
+			if (fractional > 0.0) {
+				return integral + copysign(1.0, integral);
+			}
+
+			return integral;
+
 		case PHP_ROUND_HALF_EVEN:
 			if (fractional > 0.5) {
 				return integral + copysign(1.0, integral);
@@ -143,6 +167,7 @@ static inline double php_round_helper(double value, int mode) {
 			}
 
 			return integral;
+
 		case PHP_ROUND_HALF_ODD:
 			if (fractional > 0.5) {
 				return integral + copysign(1.0, integral);
@@ -157,6 +182,7 @@ static inline double php_round_helper(double value, int mode) {
 			}
 
 			return integral;
+
 		EMPTY_SWITCH_DEFAULT_CASE();
 	}
 	// FIXME: GCC bug, branch is considered reachable.
@@ -340,6 +366,10 @@ PHP_FUNCTION(round)
 		case PHP_ROUND_HALF_DOWN:
 		case PHP_ROUND_HALF_EVEN:
 		case PHP_ROUND_HALF_ODD:
+		case PHP_ROUND_AWAY_FROM_ZERO:
+		case PHP_ROUND_TOWARD_ZERO:
+		case PHP_ROUND_CEILING:
+		case PHP_ROUND_FLOOR:
 			break;
 		default:
 			zend_argument_value_error(3, "must be a valid rounding mode (PHP_ROUND_*)");
diff --git a/ext/standard/php_math.h b/ext/standard/php_math.h
index 1cdba0fe9d0a6..6ff895cce3c8d 100644
--- a/ext/standard/php_math.h
+++ b/ext/standard/php_math.h
@@ -103,7 +103,7 @@ PHPAPI zend_string * _php_math_zvaltobase(zval *arg, int base);
 #endif
 
 #ifndef PHP_ROUND_HALF_DOWN
-#define PHP_ROUND_HALF_DOWN      0x02    /* Down == towards zero */
+#define PHP_ROUND_HALF_DOWN      0x02    /* Arithmetic rounding, down == towards zero */
 #endif
 
 #ifndef PHP_ROUND_HALF_EVEN
@@ -114,4 +114,20 @@ PHPAPI zend_string * _php_math_zvaltobase(zval *arg, int base);
 #define PHP_ROUND_HALF_ODD       0x04
 #endif
 
+#ifndef PHP_ROUND_CEILING
+#define PHP_ROUND_CEILING        0x05
+#endif
+
+#ifndef PHP_ROUND_FLOOR
+#define PHP_ROUND_FLOOR          0x06
+#endif
+
+#ifndef PHP_ROUND_TOWARD_ZERO
+#define PHP_ROUND_TOWARD_ZERO    0x07
+#endif
+
+#ifndef PHP_ROUND_AWAY_FROM_ZERO
+#define PHP_ROUND_AWAY_FROM_ZERO 0x08
+#endif
+
 #endif /* PHP_MATH_H */
diff --git a/ext/standard/tests/math/round_modes.phpt b/ext/standard/tests/math/round_modes.phpt
index 61a697bc2d73b..06a793211b3a7 100644
--- a/ext/standard/tests/math/round_modes.phpt
+++ b/ext/standard/tests/math/round_modes.phpt
@@ -7,6 +7,10 @@ $modes = [
     "PHP_ROUND_HALF_DOWN" => PHP_ROUND_HALF_DOWN,
     "PHP_ROUND_HALF_EVEN" => PHP_ROUND_HALF_EVEN,
     "PHP_ROUND_HALF_ODD" => PHP_ROUND_HALF_ODD,
+    "PHP_ROUND_CEILING" => PHP_ROUND_CEILING,
+    "PHP_ROUND_FLOOR" => PHP_ROUND_FLOOR,
+    "PHP_ROUND_TOWARD_ZERO" => PHP_ROUND_TOWARD_ZERO,
+    "PHP_ROUND_AWAY_FROM_ZERO" => PHP_ROUND_AWAY_FROM_ZERO,
 ];
 
 $numbers = [
@@ -16,15 +20,20 @@ $numbers = [
     -3.5,
     7,
     -7,
+    15.51,
+    -15.51,
+    5,
+    -5,
     0.61,
     0.69,
-    0,
+    0.65,
+    -0.65,
     1.9999,
     -1.9999,
     0.0001,
     -0.0001,
 ];
-$precisions = [0, 1, 2, 10];
+$precisions = [-1, 0, 1, 2, 10];
 
 foreach ($modes as $modeKey => $mode) {
     echo "mode: $modeKey\n";
@@ -43,6 +52,26 @@ foreach ($modes as $modeKey => $mode) {
 ?>
 --EXPECT--
 mode: PHP_ROUND_HALF_UP
+	precision: -1
+		    2.5 => 0
+		   -2.5 => -0
+		    3.5 => 0
+		   -3.5 => -0
+		      7 => 10
+		     -7 => -10
+		  15.51 => 20
+		 -15.51 => -20
+		      5 => 10
+		     -5 => -10
+		   0.61 => 0
+		   0.69 => 0
+		   0.65 => 0
+		  -0.65 => -0
+		 1.9999 => 0
+		-1.9999 => -0
+		 0.0001 => 0
+		-0.0001 => -0
+
 	precision: 0
 		    2.5 => 3
 		   -2.5 => -3
@@ -50,9 +79,14 @@ mode: PHP_ROUND_HALF_UP
 		   -3.5 => -4
 		      7 => 7
 		     -7 => -7
+		  15.51 => 16
+		 -15.51 => -16
+		      5 => 5
+		     -5 => -5
 		   0.61 => 1
 		   0.69 => 1
-		      0 => 0
+		   0.65 => 1
+		  -0.65 => -1
 		 1.9999 => 2
 		-1.9999 => -2
 		 0.0001 => 0
@@ -65,9 +99,14 @@ mode: PHP_ROUND_HALF_UP
 		   -3.5 => -3.5
 		      7 => 7
 		     -7 => -7
+		  15.51 => 15.5
+		 -15.51 => -15.5
+		      5 => 5
+		     -5 => -5
 		   0.61 => 0.6
 		   0.69 => 0.7
-		      0 => 0
+		   0.65 => 0.7
+		  -0.65 => -0.7
 		 1.9999 => 2
 		-1.9999 => -2
 		 0.0001 => 0
@@ -80,9 +119,14 @@ mode: PHP_ROUND_HALF_UP
 		   -3.5 => -3.5
 		      7 => 7
 		     -7 => -7
+		  15.51 => 15.51
+		 -15.51 => -15.51
+		      5 => 5
+		     -5 => -5
 		   0.61 => 0.61
 		   0.69 => 0.69
-		      0 => 0
+		   0.65 => 0.65
+		  -0.65 => -0.65
 		 1.9999 => 2
 		-1.9999 => -2
 		 0.0001 => 0
@@ -95,15 +139,40 @@ mode: PHP_ROUND_HALF_UP
 		   -3.5 => -3.5
 		      7 => 7
 		     -7 => -7
+		  15.51 => 15.51
+		 -15.51 => -15.51
+		      5 => 5
+		     -5 => -5
 		   0.61 => 0.61
 		   0.69 => 0.69
-		      0 => 0
+		   0.65 => 0.65
+		  -0.65 => -0.65
 		 1.9999 => 1.9999
 		-1.9999 => -1.9999
 		 0.0001 => 0.0001
 		-0.0001 => -0.0001
 
 mode: PHP_ROUND_HALF_DOWN
+	precision: -1
+		    2.5 => 0
+		   -2.5 => -0
+		    3.5 => 0
+		   -3.5 => -0
+		      7 => 10
+		     -7 => -10
+		  15.51 => 20
+		 -15.51 => -20
+		      5 => 0
+		     -5 => -0
+		   0.61 => 0
+		   0.69 => 0
+		   0.65 => 0
+		  -0.65 => -0
+		 1.9999 => 0
+		-1.9999 => -0
+		 0.0001 => 0
+		-0.0001 => -0
+
 	precision: 0
 		    2.5 => 2
 		   -2.5 => -2
@@ -111,9 +180,14 @@ mode: PHP_ROUND_HALF_DOWN
 		   -3.5 => -3
 		      7 => 7
 		     -7 => -7
+		  15.51 => 16
+		 -15.51 => -16
+		      5 => 5
+		     -5 => -5
 		   0.61 => 1
 		   0.69 => 1
-		      0 => 0
+		   0.65 => 1
+		  -0.65 => -1
 		 1.9999 => 2
 		-1.9999 => -2
 		 0.0001 => 0
@@ -126,9 +200,14 @@ mode: PHP_ROUND_HALF_DOWN
 		   -3.5 => -3.5
 		      7 => 7
 		     -7 => -7
+		  15.51 => 15.5
+		 -15.51 => -15.5
+		      5 => 5
+		     -5 => -5
 		   0.61 => 0.6
 		   0.69 => 0.7
-		      0 => 0
+		   0.65 => 0.6
+		  -0.65 => -0.6
 		 1.9999 => 2
 		-1.9999 => -2
 		 0.0001 => 0
@@ -141,9 +220,14 @@ mode: PHP_ROUND_HALF_DOWN
 		   -3.5 => -3.5
 		      7 => 7
 		     -7 => -7
+		  15.51 => 15.51
+		 -15.51 => -15.51
+		      5 => 5
+		     -5 => -5
 		   0.61 => 0.61
 		   0.69 => 0.69
-		      0 => 0
+		   0.65 => 0.65
+		  -0.65 => -0.65
 		 1.9999 => 2
 		-1.9999 => -2
 		 0.0001 => 0
@@ -156,15 +240,40 @@ mode: PHP_ROUND_HALF_DOWN
 		   -3.5 => -3.5
 		      7 => 7
 		     -7 => -7
+		  15.51 => 15.51
+		 -15.51 => -15.51
+		      5 => 5
+		     -5 => -5
 		   0.61 => 0.61
 		   0.69 => 0.69
-		      0 => 0
+		   0.65 => 0.65
+		  -0.65 => -0.65
 		 1.9999 => 1.9999
 		-1.9999 => -1.9999
 		 0.0001 => 0.0001
 		-0.0001 => -0.0001
 
 mode: PHP_ROUND_HALF_EVEN
+	precision: -1
+		    2.5 => 0
+		   -2.5 => -0
+		    3.5 => 0
+		   -3.5 => -0
+		      7 => 10
+		     -7 => -10
+		  15.51 => 20
+		 -15.51 => -20
+		      5 => 0
+		     -5 => -0
+		   0.61 => 0
+		   0.69 => 0
+		   0.65 => 0
+		  -0.65 => -0
+		 1.9999 => 0
+		-1.9999 => -0
+		 0.0001 => 0
+		-0.0001 => -0
+
 	precision: 0
 		    2.5 => 2
 		   -2.5 => -2
@@ -172,9 +281,14 @@ mode: PHP_ROUND_HALF_EVEN
 		   -3.5 => -4
 		      7 => 7
 		     -7 => -7
+		  15.51 => 16
+		 -15.51 => -16
+		      5 => 5
+		     -5 => -5
 		   0.61 => 1
 		   0.69 => 1
-		      0 => 0
+		   0.65 => 1
+		  -0.65 => -1
 		 1.9999 => 2
 		-1.9999 => -2
 		 0.0001 => 0
@@ -187,9 +301,14 @@ mode: PHP_ROUND_HALF_EVEN
 		   -3.5 => -3.5
 		      7 => 7
 		     -7 => -7
+		  15.51 => 15.5
+		 -15.51 => -15.5
+		      5 => 5
+		     -5 => -5
 		   0.61 => 0.6
 		   0.69 => 0.7
-		      0 => 0
+		   0.65 => 0.6
+		  -0.65 => -0.6
 		 1.9999 => 2
 		-1.9999 => -2
 		 0.0001 => 0
@@ -202,9 +321,14 @@ mode: PHP_ROUND_HALF_EVEN
 		   -3.5 => -3.5
 		      7 => 7
 		     -7 => -7
+		  15.51 => 15.51
+		 -15.51 => -15.51
+		      5 => 5
+		     -5 => -5
 		   0.61 => 0.61
 		   0.69 => 0.69
-		      0 => 0
+		   0.65 => 0.65
+		  -0.65 => -0.65
 		 1.9999 => 2
 		-1.9999 => -2
 		 0.0001 => 0
@@ -217,15 +341,40 @@ mode: PHP_ROUND_HALF_EVEN
 		   -3.5 => -3.5
 		      7 => 7
 		     -7 => -7
+		  15.51 => 15.51
+		 -15.51 => -15.51
+		      5 => 5
+		     -5 => -5
 		   0.61 => 0.61
 		   0.69 => 0.69
-		      0 => 0
+		   0.65 => 0.65
+		  -0.65 => -0.65
 		 1.9999 => 1.9999
 		-1.9999 => -1.9999
 		 0.0001 => 0.0001
 		-0.0001 => -0.0001
 
 mode: PHP_ROUND_HALF_ODD
+	precision: -1
+		    2.5 => 0
+		   -2.5 => -0
+		    3.5 => 0
+		   -3.5 => -0
+		      7 => 10
+		     -7 => -10
+		  15.51 => 20
+		 -15.51 => -20
+		      5 => 10
+		     -5 => -10
+		   0.61 => 0
+		   0.69 => 0
+		   0.65 => 0
+		  -0.65 => -0
+		 1.9999 => 0
+		-1.9999 => -0
+		 0.0001 => 0
+		-0.0001 => -0
+
 	precision: 0
 		    2.5 => 3
 		   -2.5 => -3
@@ -233,9 +382,14 @@ mode: PHP_ROUND_HALF_ODD
 		   -3.5 => -3
 		      7 => 7
 		     -7 => -7
+		  15.51 => 16
+		 -15.51 => -16
+		      5 => 5
+		     -5 => -5
 		   0.61 => 1
 		   0.69 => 1
-		      0 => 0
+		   0.65 => 1
+		  -0.65 => -1
 		 1.9999 => 2
 		-1.9999 => -2
 		 0.0001 => 0
@@ -248,9 +402,14 @@ mode: PHP_ROUND_HALF_ODD
 		   -3.5 => -3.5
 		      7 => 7
 		     -7 => -7
+		  15.51 => 15.5
+		 -15.51 => -15.5
+		      5 => 5
+		     -5 => -5
 		   0.61 => 0.6
 		   0.69 => 0.7
-		      0 => 0
+		   0.65 => 0.7
+		  -0.65 => -0.7
 		 1.9999 => 2
 		-1.9999 => -2
 		 0.0001 => 0
@@ -263,12 +422,320 @@ mode: PHP_ROUND_HALF_ODD
 		   -3.5 => -3.5
 		      7 => 7
 		     -7 => -7
+		  15.51 => 15.51
+		 -15.51 => -15.51
+		      5 => 5
+		     -5 => -5
+		   0.61 => 0.61
+		   0.69 => 0.69
+		   0.65 => 0.65
+		  -0.65 => -0.65
+		 1.9999 => 2
+		-1.9999 => -2
+		 0.0001 => 0
+		-0.0001 => -0
+
+	precision: 10
+		    2.5 => 2.5
+		   -2.5 => -2.5
+		    3.5 => 3.5
+		   -3.5 => -3.5
+		      7 => 7
+		     -7 => -7
+		  15.51 => 15.51
+		 -15.51 => -15.51
+		      5 => 5
+		     -5 => -5
+		   0.61 => 0.61
+		   0.69 => 0.69
+		   0.65 => 0.65
+		  -0.65 => -0.65
+		 1.9999 => 1.9999
+		-1.9999 => -1.9999
+		 0.0001 => 0.0001
+		-0.0001 => -0.0001
+
+mode: PHP_ROUND_CEILING
+	precision: -1
+		    2.5 => 10
+		   -2.5 => -0
+		    3.5 => 10
+		   -3.5 => -0
+		      7 => 10
+		     -7 => -0
+		  15.51 => 20
+		 -15.51 => -10
+		      5 => 10
+		     -5 => -0
+		   0.61 => 10
+		   0.69 => 10
+		   0.65 => 10
+		  -0.65 => -0
+		 1.9999 => 10
+		-1.9999 => -0
+		 0.0001 => 10
+		-0.0001 => -0
+
+	precision: 0
+		    2.5 => 3
+		   -2.5 => -2
+		    3.5 => 4
+		   -3.5 => -3
+		      7 => 7
+		     -7 => -7
+		  15.51 => 16
+		 -15.51 => -15
+		      5 => 5
+		     -5 => -5
+		   0.61 => 1
+		   0.69 => 1
+		   0.65 => 1
+		  -0.65 => -0
+		 1.9999 => 2
+		-1.9999 => -1
+		 0.0001 => 1
+		-0.0001 => -0
+
+	precision: 1
+		    2.5 => 2.5
+		   -2.5 => -2.5
+		    3.5 => 3.5
+		   -3.5 => -3.5
+		      7 => 7
+		     -7 => -7
+		  15.51 => 15.6
+		 -15.51 => -15.5
+		      5 => 5
+		     -5 => -5
+		   0.61 => 0.7
+		   0.69 => 0.7
+		   0.65 => 0.7
+		  -0.65 => -0.6
+		 1.9999 => 2
+		-1.9999 => -1.9
+		 0.0001 => 0.1
+		-0.0001 => -0
+
+	precision: 2
+		    2.5 => 2.5
+		   -2.5 => -2.5
+		    3.5 => 3.5
+		   -3.5 => -3.5
+		      7 => 7
+		     -7 => -7
+		  15.51 => 15.51
+		 -15.51 => -15.51
+		      5 => 5
+		     -5 => -5
 		   0.61 => 0.61
 		   0.69 => 0.69
-		      0 => 0
+		   0.65 => 0.65
+		  -0.65 => -0.65
 		 1.9999 => 2
+		-1.9999 => -1.99
+		 0.0001 => 0.01
+		-0.0001 => -0
+
+	precision: 10
+		    2.5 => 2.5
+		   -2.5 => -2.5
+		    3.5 => 3.5
+		   -3.5 => -3.5
+		      7 => 7
+		     -7 => -7
+		  15.51 => 15.51
+		 -15.51 => -15.51
+		      5 => 5
+		     -5 => -5
+		   0.61 => 0.61
+		   0.69 => 0.69
+		   0.65 => 0.65
+		  -0.65 => -0.65
+		 1.9999 => 1.9999
+		-1.9999 => -1.9999
+		 0.0001 => 0.0001
+		-0.0001 => -0.0001
+
+mode: PHP_ROUND_FLOOR
+	precision: -1
+		    2.5 => 0
+		   -2.5 => -10
+		    3.5 => 0
+		   -3.5 => -10
+		      7 => 0
+		     -7 => -10
+		  15.51 => 10
+		 -15.51 => -20
+		      5 => 0
+		     -5 => -10
+		   0.61 => 0
+		   0.69 => 0
+		   0.65 => 0
+		  -0.65 => -10
+		 1.9999 => 0
+		-1.9999 => -10
+		 0.0001 => 0
+		-0.0001 => -10
+
+	precision: 0
+		    2.5 => 2
+		   -2.5 => -3
+		    3.5 => 3
+		   -3.5 => -4
+		      7 => 7
+		     -7 => -7
+		  15.51 => 15
+		 -15.51 => -16
+		      5 => 5
+		     -5 => -5
+		   0.61 => 0
+		   0.69 => 0
+		   0.65 => 0
+		  -0.65 => -1
+		 1.9999 => 1
+		-1.9999 => -2
+		 0.0001 => 0
+		-0.0001 => -1
+
+	precision: 1
+		    2.5 => 2.5
+		   -2.5 => -2.5
+		    3.5 => 3.5
+		   -3.5 => -3.5
+		      7 => 7
+		     -7 => -7
+		  15.51 => 15.5
+		 -15.51 => -15.6
+		      5 => 5
+		     -5 => -5
+		   0.61 => 0.6
+		   0.69 => 0.6
+		   0.65 => 0.6
+		  -0.65 => -0.7
+		 1.9999 => 1.9
+		-1.9999 => -2
+		 0.0001 => 0
+		-0.0001 => -0.1
+
+	precision: 2
+		    2.5 => 2.5
+		   -2.5 => -2.5
+		    3.5 => 3.5
+		   -3.5 => -3.5
+		      7 => 7
+		     -7 => -7
+		  15.51 => 15.51
+		 -15.51 => -15.51
+		      5 => 5
+		     -5 => -5
+		   0.61 => 0.61
+		   0.69 => 0.69
+		   0.65 => 0.65
+		  -0.65 => -0.65
+		 1.9999 => 1.99
 		-1.9999 => -2
 		 0.0001 => 0
+		-0.0001 => -0.01
+
+	precision: 10
+		    2.5 => 2.5
+		   -2.5 => -2.5
+		    3.5 => 3.5
+		   -3.5 => -3.5
+		      7 => 7
+		     -7 => -7
+		  15.51 => 15.51
+		 -15.51 => -15.51
+		      5 => 5
+		     -5 => -5
+		   0.61 => 0.61
+		   0.69 => 0.69
+		   0.65 => 0.65
+		  -0.65 => -0.65
+		 1.9999 => 1.9999
+		-1.9999 => -1.9999
+		 0.0001 => 0.0001
+		-0.0001 => -0.0001
+
+mode: PHP_ROUND_TOWARD_ZERO
+	precision: -1
+		    2.5 => 0
+		   -2.5 => -0
+		    3.5 => 0
+		   -3.5 => -0
+		      7 => 0
+		     -7 => -0
+		  15.51 => 10
+		 -15.51 => -10
+		      5 => 0
+		     -5 => -0
+		   0.61 => 0
+		   0.69 => 0
+		   0.65 => 0
+		  -0.65 => -0
+		 1.9999 => 0
+		-1.9999 => -0
+		 0.0001 => 0
+		-0.0001 => -0
+
+	precision: 0
+		    2.5 => 2
+		   -2.5 => -2
+		    3.5 => 3
+		   -3.5 => -3
+		      7 => 7
+		     -7 => -7
+		  15.51 => 15
+		 -15.51 => -15
+		      5 => 5
+		     -5 => -5
+		   0.61 => 0
+		   0.69 => 0
+		   0.65 => 0
+		  -0.65 => -0
+		 1.9999 => 1
+		-1.9999 => -1
+		 0.0001 => 0
+		-0.0001 => -0
+
+	precision: 1
+		    2.5 => 2.5
+		   -2.5 => -2.5
+		    3.5 => 3.5
+		   -3.5 => -3.5
+		      7 => 7
+		     -7 => -7
+		  15.51 => 15.5
+		 -15.51 => -15.5
+		      5 => 5
+		     -5 => -5
+		   0.61 => 0.6
+		   0.69 => 0.6
+		   0.65 => 0.6
+		  -0.65 => -0.6
+		 1.9999 => 1.9
+		-1.9999 => -1.9
+		 0.0001 => 0
+		-0.0001 => -0
+
+	precision: 2
+		    2.5 => 2.5
+		   -2.5 => -2.5
+		    3.5 => 3.5
+		   -3.5 => -3.5
+		      7 => 7
+		     -7 => -7
+		  15.51 => 15.51
+		 -15.51 => -15.51
+		      5 => 5
+		     -5 => -5
+		   0.61 => 0.61
+		   0.69 => 0.69
+		   0.65 => 0.65
+		  -0.65 => -0.65
+		 1.9999 => 1.99
+		-1.9999 => -1.99
+		 0.0001 => 0
 		-0.0001 => -0
 
 	precision: 10
@@ -278,9 +745,115 @@ mode: PHP_ROUND_HALF_ODD
 		   -3.5 => -3.5
 		      7 => 7
 		     -7 => -7
+		  15.51 => 15.51
+		 -15.51 => -15.51
+		      5 => 5
+		     -5 => -5
+		   0.61 => 0.61
+		   0.69 => 0.69
+		   0.65 => 0.65
+		  -0.65 => -0.65
+		 1.9999 => 1.9999
+		-1.9999 => -1.9999
+		 0.0001 => 0.0001
+		-0.0001 => -0.0001
+
+mode: PHP_ROUND_AWAY_FROM_ZERO
+	precision: -1
+		    2.5 => 10
+		   -2.5 => -10
+		    3.5 => 10
+		   -3.5 => -10
+		      7 => 10
+		     -7 => -10
+		  15.51 => 20
+		 -15.51 => -20
+		      5 => 10
+		     -5 => -10
+		   0.61 => 10
+		   0.69 => 10
+		   0.65 => 10
+		  -0.65 => -10
+		 1.9999 => 10
+		-1.9999 => -10
+		 0.0001 => 10
+		-0.0001 => -10
+
+	precision: 0
+		    2.5 => 3
+		   -2.5 => -3
+		    3.5 => 4
+		   -3.5 => -4
+		      7 => 7
+		     -7 => -7
+		  15.51 => 16
+		 -15.51 => -16
+		      5 => 5
+		     -5 => -5
+		   0.61 => 1
+		   0.69 => 1
+		   0.65 => 1
+		  -0.65 => -1
+		 1.9999 => 2
+		-1.9999 => -2
+		 0.0001 => 1
+		-0.0001 => -1
+
+	precision: 1
+		    2.5 => 2.5
+		   -2.5 => -2.5
+		    3.5 => 3.5
+		   -3.5 => -3.5
+		      7 => 7
+		     -7 => -7
+		  15.51 => 15.6
+		 -15.51 => -15.6
+		      5 => 5
+		     -5 => -5
+		   0.61 => 0.7
+		   0.69 => 0.7
+		   0.65 => 0.7
+		  -0.65 => -0.7
+		 1.9999 => 2
+		-1.9999 => -2
+		 0.0001 => 0.1
+		-0.0001 => -0.1
+
+	precision: 2
+		    2.5 => 2.5
+		   -2.5 => -2.5
+		    3.5 => 3.5
+		   -3.5 => -3.5
+		      7 => 7
+		     -7 => -7
+		  15.51 => 15.51
+		 -15.51 => -15.51
+		      5 => 5
+		     -5 => -5
+		   0.61 => 0.61
+		   0.69 => 0.69
+		   0.65 => 0.65
+		  -0.65 => -0.65
+		 1.9999 => 2
+		-1.9999 => -2
+		 0.0001 => 0.01
+		-0.0001 => -0.01
+
+	precision: 10
+		    2.5 => 2.5
+		   -2.5 => -2.5
+		    3.5 => 3.5
+		   -3.5 => -3.5
+		      7 => 7
+		     -7 => -7
+		  15.51 => 15.51
+		 -15.51 => -15.51
+		      5 => 5
+		     -5 => -5
 		   0.61 => 0.61
 		   0.69 => 0.69
-		      0 => 0
+		   0.65 => 0.65
+		  -0.65 => -0.65
 		 1.9999 => 1.9999
 		-1.9999 => -1.9999
 		 0.0001 => 0.0001
diff --git a/ext/standard/tests/math/round_modes_ceiling_and_floor.phpt b/ext/standard/tests/math/round_modes_ceiling_and_floor.phpt
new file mode 100644
index 0000000000000..1b3a34f0f98ec
--- /dev/null
+++ b/ext/standard/tests/math/round_modes_ceiling_and_floor.phpt
@@ -0,0 +1,69 @@
+--TEST--
+round() with modes PHP_ROUND_CEILING and PHP_ROUND_FLOOR
+--FILE--
+<?php
+$modes = [
+    PHP_ROUND_CEILING, PHP_ROUND_FLOOR,
+];
+
+$numbers = [
+    2.5,
+    -2.5,
+    3.5,
+    -3.5,
+    7,
+    -7,
+    0.61,
+    0.69,
+    0,
+    -0,
+    1.9999,
+    -1.9999,
+    0.0001,
+    -0.0001,
+];
+
+echo "mode PHP_ROUND_CEILING\n";
+foreach($numbers as $number) {
+    var_dump(ceil($number) === round($number, 0, PHP_ROUND_CEILING));
+}
+
+echo "\n";
+echo "mode PHP_ROUND_FLOOR\n";
+foreach($numbers as $number) {
+    var_dump(floor($number) === round($number, 0, PHP_ROUND_FLOOR));
+}
+
+?>
+--EXPECT--
+mode PHP_ROUND_CEILING
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+
+mode PHP_ROUND_FLOOR
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
diff --git a/ext/standard/tests/math/round_modes_zeros.phpt b/ext/standard/tests/math/round_modes_zeros.phpt
new file mode 100644
index 0000000000000..cdf97395dd9bf
--- /dev/null
+++ b/ext/standard/tests/math/round_modes_zeros.phpt
@@ -0,0 +1,230 @@
+--TEST--
+round() with different rounding modes for zeros
+--FILE--
+<?php
+$modes = [
+    "PHP_ROUND_HALF_UP" => PHP_ROUND_HALF_UP,
+    "PHP_ROUND_HALF_DOWN" => PHP_ROUND_HALF_DOWN,
+    "PHP_ROUND_HALF_EVEN" => PHP_ROUND_HALF_EVEN,
+    "PHP_ROUND_HALF_ODD" => PHP_ROUND_HALF_ODD,
+    "PHP_ROUND_CEILING" => PHP_ROUND_CEILING,
+    "PHP_ROUND_FLOOR" => PHP_ROUND_FLOOR,
+    "PHP_ROUND_TOWARD_ZERO" => PHP_ROUND_TOWARD_ZERO,
+    "PHP_ROUND_AWAY_FROM_ZERO" => PHP_ROUND_AWAY_FROM_ZERO,
+];
+
+$precisions = [-1, 0, 1, 2];
+
+foreach ($modes as $modeKey => $mode) {
+    echo "mode: $modeKey\n";
+    foreach ($precisions as $precision) {
+        echo "\tprecision: $precision\n";
+        echo "\t\t     0 => " . round(0, $precision, $mode) . "\n";
+        echo "\t\t    -0 => " . round(-0, $precision, $mode) . "\n";
+        echo "\t\t   0.0 => " . round(0.0, $precision, $mode) . "\n";
+        echo "\t\t  -0.0 => " . round(-0.0, $precision, $mode) . "\n";
+        echo "\n";
+    }
+}
+
+?>
+--EXPECT--
+mode: PHP_ROUND_HALF_UP
+	precision: -1
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 0
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 1
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 2
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+mode: PHP_ROUND_HALF_DOWN
+	precision: -1
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 0
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 1
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 2
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+mode: PHP_ROUND_HALF_EVEN
+	precision: -1
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 0
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 1
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 2
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+mode: PHP_ROUND_HALF_ODD
+	precision: -1
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 0
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 1
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 2
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+mode: PHP_ROUND_CEILING
+	precision: -1
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 0
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 1
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 2
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+mode: PHP_ROUND_FLOOR
+	precision: -1
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 0
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 1
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 2
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+mode: PHP_ROUND_TOWARD_ZERO
+	precision: -1
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 0
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 1
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 2
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+mode: PHP_ROUND_AWAY_FROM_ZERO
+	precision: -1
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 0
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 1
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0
+
+	precision: 2
+		     0 => 0
+		    -0 => 0
+		   0.0 => 0
+		  -0.0 => -0