3v4l.org

run code in 300+ PHP versions simultaneously
<?php trigger_error('ha', E_USER_WARNING); $msg = null; set_error_handler(function ($errno, $errstr, $errfile, $errline, $errcontext) use (&$msg) { $msg = $errstr; }); print $msg; ?>

preferences:
37.33 ms | 402 KiB | 5 Q