3v4l.org

run code in 300+ PHP versions simultaneously
<?php error_reporting(E_ALL); echo('start'); function _($x){return ($x)?htmlspecialchars($x):'nbsp;';} echo('end');
Output for 7.2.29 - 7.2.33, 7.3.16 - 7.3.21, 7.4.3 - 7.4.9, 8.0.0alpha1 - beta1
startend
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30, 7.0.0 - 7.0.20, 7.1.0 - 7.1.9
Fatal error: Cannot redeclare _() in /in/f9poH on line 4
Process exited with code 255.