3v4l.org

run code in 300+ PHP versions simultaneously
<?php $in = "1234"; $arr = array($in => "foobar"); $keys = array_keys($arr); $out = $keys[0]; var_dump($keys); var_dump($in == $out); var_dump($in === $out); ?>

preferences:
36.33 ms | 402 KiB | 5 Q