3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = 'hola '; $append = function ($carry, $append) { return $carry .= $append; }; echo $append($a, 'Nico') . PHP_EOL;
Output for 7.0.0 - 7.0.25, 7.1.0 - 7.1.33, 7.2.5 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.14, 8.4.1 - 8.4.2
hola Nico
preferences:
88.45 ms | 407 KiB | 5 Q