3v4l.org

run code in 300+ PHP versions simultaneously
<?php <?php $array = array(0 => 100, "color" => "red"); $keys = array_keys($array,"red"); print_r($keys); ?>
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.7
Parse error: syntax error, unexpected '<', expecting end of file in /in/u9Z2j on line 3
Process exited with code 255.
preferences:
163.27 ms | 1395 KiB | 36 Q