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<?php $mainArray = array( 0 =>array( "key1" => array(7,4,5), 'key2' => array('cc','aa') ) ); foreach($mainArray as $secondIndex=>$secondArray){ foreach($secondArray as $index=>$array){ array_multisort($array); $secondArray[$index] = $array; } $mainArray[$secondIndex] = $secondArray; } var_dump($mainArray);

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232.33 ms | 406 KiB | 5 Q