add test

Author: devnexen

Zend/zend_API.h

@@ -844,6 +844,7 @@ static zend_always_inline void zend_call_known_fcc(
 {
 	zend_function *func = fcc->function_handler;
 	if (UNEXPECTED(!func)) {
+		ZVAL_UNDEF(retval_ptr);
 		return;
 	}
 	/* Need to copy trampolines as they get released after they are called */

ext/curl/tests/gh16359.phpt

@@ -0,0 +1,17 @@
+--TEST--
+GH-16360 - curl_setopt with CURLOPT_WRITEFUNCTION and no user fn
+--EXTENSIONS--
+curl
+--FILE--
+<?php
+$log_file = tempnam(sys_get_temp_dir(), 'php-curl-CURLOPT_WRITEFUNCTION-trampoline');
+$fp = fopen($log_file, 'w+');
+fwrite($fp, "test");
+$ch = curl_init();
+curl_setopt($ch, CURLOPT_WRITEFUNCTION, null);
+curl_setopt($ch, CURLOPT_URL, 'file://' . $log_file);
+curl_exec($ch);
+echo "DONE";
+?>
+--EXPECT--
+DONE