Online PHP editor | refs for eaaaZ

<?php $tmp_array_value = array ( '9e5dae29ec5a83d503f2e4d4b5f29f91' => array ( '007Hal007' => array ( 'C0' => 2, 'C1' => 1, 'C2' => 1, ), ), '9317264ea7cc25c6f4f92bbdeb01ec63' => array ( '011210' => array ( 'C0' => 3, 'C1' => 1, 'C2' => 1, 'C3' => 1, ), ), 'c911f95676eb7e5979fda3770bff1a03' => array ( '022218' => array ( 'C0' => 1, 'C1' => 1, 'C2' => 1, 'C3' => 1, ), ) ); uasort($tmp_array_value, function ($a, $b) { return array_values($a)[0]['C0'] - array_values($b)[0]['C0']; }); print_r($tmp_array_value);