Merge branch 'PHP-8.0' into PHP-8.1

* PHP-8.0:
  Fixed GH-8044 (var_export/debug_zval_dump HT_ASSERT_RC1 debug failure for SplFixedArray)

Author: dstogov

ext/spl/spl_fixedarray.c

@@ -214,6 +214,10 @@ static HashTable* spl_fixedarray_object_get_properties(zend_object *obj)
 	if (!spl_fixedarray_empty(&intern->array)) {
 		zend_long j = zend_hash_num_elements(ht);
 
+		if (GC_REFCOUNT(ht) > 1) {
+			intern->std.properties = zend_array_dup(ht);
+			GC_TRY_DELREF(ht);
+		}
 		for (zend_long i = 0; i < intern->array.size; i++) {
 			zend_hash_index_update(ht, i, &intern->array.elements[i]);
 			Z_TRY_ADDREF(intern->array.elements[i]);

ext/spl/tests/fixedarray_022.phpt

@@ -0,0 +1,20 @@
+--TEST--
+SPL: FixedArray: Bug GH-8044 (var_export/debug_zval_dump HT_ASSERT_RC1 debug failure for SplFixedArray)
+--FILE--
+<?php
+call_user_func(function () {
+    $x = new SplFixedArray(1);
+    $x[0] = $x;
+    var_export($x); echo "\n";
+    debug_zval_dump($x); echo "\n";
+});
+?>
+--EXPECTF--
+Warning: var_export does not handle circular references in %s on line 5
+SplFixedArray::__set_state(array(
+   0 => NULL,
+))
+object(SplFixedArray)#2 (1) refcount(4){
+  [0]=>
+  *RECURSION*
+}