Merge branch 'PHP-8.0' into PHP-8.1

* PHP-8.0:
  Fix GH-9697: array_walk($ffiInstance, function () {}) crashes due to expecting mutable array

Author: dstogov

ext/ffi/tests/gh9697.phpt

@@ -0,0 +1,14 @@
+--TEST--
+GH-9697 (array_walk($ffiInstance, function () {}) crashes due to expecting mutable array)
+--EXTENSIONS--
+ffi
+--INI--
+ffi.enable=1
+--FILE--
+<?php
+$x = FFI::new('int');
+array_walk($x, function($x) { echo "test\n"; });
+?>
+DONE
+--EXPECT--
+DONE

ext/standard/array.c

@@ -1319,6 +1319,10 @@ static int php_array_walk(
 	 * levels of recursion. */
 	zend_fcall_info fci = context->fci;
 
+	if (zend_hash_num_elements(target_hash) == 0) {
+		return result;
+	}
+
 	/* Set up known arguments */
 	ZVAL_UNDEF(&args[1]);
 	if (userdata) {