3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = function () {return 'hola';}(); print_r($a());
Output for 5.3.0 - 5.3.27, 5.4.0 - 5.4.21
Parse error: syntax error, unexpected '(' in /in/KjTJZ on line 2
Process exited with code 255.

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