3v4l.org

run code in 300+ PHP versions simultaneously
<?php function google($x){function_exists($x)||eval("function $x(){echo strlen($x);}");$x();) google('bing'); google('bing'); google('google');
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.29, 5.6.7 - 5.6.13
Parse error: syntax error, unexpected ')' in /in/oWCSX on line 3
Process exited with code 255.
preferences:
178.21 ms | 1400 KiB | 63 Q