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<?php $langs = array("en", "de", "pt"); foreach($langs as $val) { $array[$val] = array_values(array_diff($langs, array($val))); } print_r($array);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [en] => Array ( [0] => de [1] => pt ) [de] => Array ( [0] => en [1] => pt ) [pt] => Array ( [0] => en [1] => de ) )