3v4l.org

run code in 300+ PHP versions simultaneously
<?php $domd=new DOMDocument(); $str = "DOMDocument"; var_dump($domd instanceof $str); var_dump($domd instanceof ("DOMDocument")); // ^ is legal. // V is illegal // var_dump($domd instanceof "DOMDocument"); $code = ' var_dump($domd instanceof "DOMDocument"); '; eval($code); // the eval hack is for illustration, make it an error at run-time, rather than compile-time.
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.16, 8.4.1 - 8.4.3
bool(true) bool(true) Parse error: syntax error, unexpected double-quoted string "DOMDocument" in /in/EMRub(13) : eval()'d code on line 2
Process exited with code 255.
preferences:
63.99 ms | 406 KiB | 5 Q