Add support for named parameters

Author: nikic

scalar_objects.c

@@ -159,6 +159,7 @@ static zend_function *scalar_objects_get_indirection_func(
 	ind->fn.handler = scalar_objects_indirection_func;
 	ind->fn.scope = ce;
 	ind->fn.fn_flags = ZEND_ACC_CALL_VIA_HANDLER | (fbc->common.fn_flags & keep_flags);
+	ind->fn.fn_flags |= ZEND_ACC_USER_ARG_INFO;
 	ind->fn.num_args = fbc->common.num_args - 1;
 	ind->fn.required_num_args = fbc->common.required_num_args - 1;
 #if PHP_VERSION_ID >= 80000

tests/named_params.phpt

@@ -0,0 +1,29 @@
+--TEST--
+Named parameters
+--SKIPIF--
+<?php
+if (PHP_VERSION_ID < 80000) die('skip For PHP >= 8.0 only');
+?>
+--FILE--
+<?php
+
+register_primitive_type_handler('string', 'StringHandler');
+
+class StringHandler {
+    public static function test($self, $prefix = '', $suffix = '') {
+        return $prefix . $self . $suffix;
+    }
+}
+
+$string = "Test";
+var_dump($string->test(prefix: "P"));
+var_dump($string->test(suffix: "S"));
+var_dump($string->test(prefix: "P", suffix: "S"));
+var_dump($string->test(suffix: "S", prefix: "P"));
+
+?>
+--EXPECT--
+string(5) "PTest"
+string(5) "TestS"
+string(6) "PTestS"
+string(6) "PTestS"