3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function foo() { return '42'; } echo preg_replace("/.|foo/e\0bar/i", 'foo()', 'foo');
Output for 5.4.7 - 7.2.0
Warning: preg_replace(): Null byte in regex in /in/RiH8r on line 4
Output for 4.3.0 - 5.4.6
424242