<?php $array = [ ['key' => 1], ['key' => 2], ['key' => 3], ['key' => 1], ['key' => 2], ['key' => 3], ['key' => 4], ['key' => 5], ['key' => 6] ]; $result = []; foreach ($array as ['key' => $k, 'key' => $result[$k]]); var_export(array_values($result));
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