3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = [1, 3, 5, 3, 7]; //[1, 3, 5, 3, 4] $sortedArr = $arr; sort($sortedArr); $filtered = array_filter( array_map(function($v1, $v2){ return ($v1 == $v2 ?FALSE:TRUE); }, $arr, $sortedArr) ); var_dump(count($filtered) > 2 ? FALSE : TRUE);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 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 - 8.3.7
bool(true)
preferences:
211.52 ms | 404 KiB | 375 Q