3v4l.org

run code in 300+ PHP versions simultaneously
<?php $checkfor = 'test'; $words = array('test','derp','herp'); function noop(){} for ($i = 1; $i++ < 100000;){ $flipped = array_flip($words); if (isset($flipped[$checkfor])) { noop(); } } /* if (in_array($checkfor,$words)) { echo "non-flip match"; } */
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 - 5.5.36, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 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:
262.37 ms | 406 KiB | 347 Q