3v4l.org

run code in 300+ PHP versions simultaneously
<?php $foo = null; $foo = function() use (&$foo){ return $foo; }; var_dump($foo()->__invoke()->==$foo);
Output for 5.4.0 - 5.4.30
Parse error: syntax error, unexpected '==' (T_IS_EQUAL), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' in /in/iNdNe on line 7
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected T_IS_EQUAL, expecting T_STRING or T_VARIABLE or '{' or '$' in /in/iNdNe on line 7
Process exited with code 255.
preferences:
188.5 ms | 1395 KiB | 67 Q