- var_dump: documentation ( source)
- array_unique: documentation ( source)
- array_walk: documentation ( source)
<?php
$data = [['WIII','WARJ'], ['WIII','WARJ'], ['WARJ','WIII']];
array_walk($data, 'sort');
$data = array_unique($data, SORT_REGULAR);
var_dump($data);