Fix handling of parse_str() with unpack in optimizer

Author: nikic

Zend/tests/parse_str_with_unpack.phpt

@@ -0,0 +1,15 @@
+--TEST--
+Calling parse_str through argument unpacking
+--FILE--
+<?php
+
+function test() {
+    $i = 0;
+    parse_str(...["i=41"]);
+    var_dump($i + 1);
+}
+test();
+
+?>
+--EXPECT--
+int(42)

ext/opcache/Optimizer/zend_optimizer.c

@@ -596,9 +596,9 @@ uint32_t zend_optimizer_classify_function(zend_string *name, uint32_t num_args)
 		return ZEND_FUNC_INDIRECT_VAR_ACCESS;
 	} else if (zend_string_equals_literal(name, "compact")) {
 		return ZEND_FUNC_INDIRECT_VAR_ACCESS;
-	} else if (zend_string_equals_literal(name, "parse_str") && num_args == 1) {
+	} else if (zend_string_equals_literal(name, "parse_str") && num_args <= 1) {
 		return ZEND_FUNC_INDIRECT_VAR_ACCESS;
-	} else if (zend_string_equals_literal(name, "mb_parse_str") && num_args == 1) {
+	} else if (zend_string_equals_literal(name, "mb_parse_str") && num_args <= 1) {
 		return ZEND_FUNC_INDIRECT_VAR_ACCESS;
 	} else if (zend_string_equals_literal(name, "get_defined_vars")) {
 		return ZEND_FUNC_INDIRECT_VAR_ACCESS;