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<?php $mainArray = array( 0 =>array( "key1" => array(7,4,5), 'key2' => array('cc','aa') ) ); array_multisort($mainArray); var_dump($mainArray);
Output for 4.3.0 - 5.6.25, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> array(2) { ["key1"]=> array(3) { [0]=> int(7) [1]=> int(4) [2]=> int(5) } ["key2"]=> array(2) { [0]=> string(2) "cc" [1]=> string(2) "aa" } } }