Online PHP editor | output for 5PDXp

<?php $array = array( "0" => array( "id" => 1, "ip" => "10.40.47.5", "visited_ip" => "10.40.40.10", "quota" => 20, ), "1" => array( "id" => 2, "ip" => "10.40.47.20", "visited_ip" => "10.40.40.10", "quota" => 10, ), "2" => array( "id" => 1, "ip" => "10.40.47.5", "visited_ip" => "10.40.40.10", "quota" => 30, ) ); foreach($array as $item){ if(!isset($res[$item['id'] . ' ' . $item['ip']])){ $res[$item['id'] . ' ' . $item['ip']] = $item; }else{ $res[$item['id'] . ' ' . $item['ip']]['quota'] += $item['quota']; } } $res = array_values($res); var_dump($res);