<?php $arr = ["ia", "ai", "go", "og", "og", "cr", "og", "rc"]; $new = array_reduce($arr, function ($acc, $item) { if (!in_array($item, $acc) && !in_array(strrev($item), $acc)) { array_push($acc, $item); } return $acc; }, []); print_r($new); //Array ( [0] => ia [1] => go [2] => cr )
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