<?php $array = [ '1-2' => 'stuff', '3-4' => 'otherstuff', '2-1' => 'morestuff', '5-6' => 'evenmorestuff', '6-5' => 'evenmorestuffagain' ]; $result = array_unique(array_map(function ($key) { $parts = explode('-', $key); sort($parts); return implode('-', $parts); }, array_keys($array))); print_r($result);
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