Fix GH-18431: Registering ZIP progress callback twice doesn't work

Libzip already cleans up the previous callback, so when that means:
1. The callback zval being already copied over the previous one causes
   libzip to clean up the new callback object. This is the root cause.
2. Our own code to clean the old callback is redundant.

Closes GH-18432.

Author: nielsdos

NEWS

@@ -14,6 +14,10 @@ PHP                                                                        NEWS
 - Standard:
   . Fixed bug GH-17403 (Potential deadlock when putenv fails). (nielsdos)
 
+- Zip:
+  . Fixed bug GH-18431 (Registering ZIP progress callback twice doesn't work).
+    (nielsdos)
+
 08 May 2025, PHP 8.3.21
 
 - Core:

ext/zip/php_zip.c

@@ -3048,14 +3048,11 @@ PHP_METHOD(ZipArchive, registerProgressCallback)
 
 	obj = Z_ZIP_P(self);
 
-	/* free if called twice */
-	_php_zip_progress_callback_free(obj);
-
 	/* register */
-	ZVAL_COPY(&obj->progress_callback, &fci.function_name);
 	if (zip_register_progress_callback_with_state(intern, rate, _php_zip_progress_callback, _php_zip_progress_callback_free, obj)) {
 		RETURN_FALSE;
 	}
+	ZVAL_COPY(&obj->progress_callback, &fci.function_name);
 
 	RETURN_TRUE;
 }
@@ -3093,14 +3090,11 @@ PHP_METHOD(ZipArchive, registerCancelCallback)
 
 	obj = Z_ZIP_P(self);
 
-	/* free if called twice */
-	_php_zip_cancel_callback_free(obj);
-
 	/* register */
-	ZVAL_COPY(&obj->cancel_callback, &fci.function_name);
 	if (zip_register_cancel_callback_with_state(intern, _php_zip_cancel_callback, _php_zip_cancel_callback_free, obj)) {
 		RETURN_FALSE;
 	}
+	ZVAL_COPY(&obj->cancel_callback, &fci.function_name);
 
 	RETURN_TRUE;
 }

ext/zip/tests/gh18431.phpt

@@ -0,0 +1,22 @@
+--TEST--
+GH-18431 (Registering ZIP progress callback twice doesn't work)
+--EXTENSIONS--
+zip
+--FILE--
+<?php
+$file = __DIR__ . '/gh18431.zip';
+$callback = var_dump(...);
+$zip = new ZipArchive;
+$zip->open($file, ZIPARCHIVE::CREATE);
+$zip->registerProgressCallback(0.5, $callback);
+$zip->registerProgressCallback(0.5, $callback);
+$zip->addFromString('foo', 'entry #1');
+?>
+--CLEAN--
+<?php
+$file = __DIR__ . '/gh18431.zip';
+@unlink($file);
+?>
+--EXPECT--
+float(0)
+float(1)