<?php $lol = [ ['for' => '$T4', 'deps' => ['$T3'] ], ['for' => '$T3', 'deps' => ['$T2'] ], ['for' => '$T1', 'deps' => [] ], ['for' => '$T2', 'deps' => ['$T1'] ], ]; uasort($lol, function($a, $b){ return in_array($a['for'], $b['deps']) ? -1 : 1; }); print_r($lol);
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