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<?php $arr = array( '2021.06.26' => array( 'type1' => array( 0 => array('name' => 'name 1', 'time' => '16:40:00'), 1 => array('name' => 'name 2', 'time' => '11:00:00'), 2 => array('name' => 'name 3', 'time' => '13:15:00'), 3 => array('name' => 'name 4', 'time' => '22:09:00'), 4 => array('name' => 'name 5', 'time' => '06:00:00'), ), 'type2' => array( 0 => array('name' => 'name 6', 'time' => '11:40:00'), 1 => array('name' => 'name 7', 'time' => '19:10:00'), 2 => array('name' => 'name 8', 'time' => '13:15:00'), 3 => array('name' => 'name 9', 'time' => '14:20:00'), 4 => array('name' => 'name 10', 'time' => '00:00:00'), ), ), ); foreach ($arr as $key => $value) { $arr[$key] = usort($value, function($a, $b){return $a[time] <=> $b['time'];}} } print_r($arr);