<?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);
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