Online PHP editor | refs for pXIZV

<?php $lol = array ( 0 => array ( 'for' => '$T4', 'deps' => array ( 0 => '$T3', ), ), 1 => array ( 'for' => '$T3', 'deps' => array ( 0 => '$T2', ), ), 2 => array ( 'for' => '$T1', 'deps' => array ( ), ), 3 => array ( 'for' => '$T2', 'deps' => array ( 0 => '$T1', ), ), ); uasort($lol, function($a, $b){ return in_array($a['for'], $b['deps']) ? -1 : 1; }); var_dump($lol);