<?php $array = [ 'user 1' => [ ['item 4' => '11385'], ['item 2' => '144268'], ['item 1' => '65774'], ['item 9' => '98523'], ], 'user 5' => [ ['item 8' => '239233'], ], 'user 2' => [ ['item 4' => '53718'], ['item 1' => '154687'], ], ]; ksort($array); foreach ($array as &$v) { array_multisort( array_map('key', $v), $v ); } var_export($array);
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