3v4l.org

run code in 300+ PHP versions simultaneously
<?php function FirstReverse($str) { $length = strlen($str)-1; $rstr = NULL; for ($i = $length; $i > -1; $i--) { $rstr .= $str[$i]; } // code goes here return $rstr; } // keep this function call here // to see how to enter arguments in PHP scroll down echo FirstReverse(fgets(fopen('php://stdin', 'r')));
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.32, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
preferences:
269.77 ms | 406 KiB | 449 Q