$arr = array( array( ‘user_id‘ => 100, ‘goods_id‘ => 10, ‘number‘ => 1, ), array( ‘user_id‘ => 102, ‘goods_id‘ => 10, ‘number‘ => 1, ), array( ‘user_id‘ => 102, ‘goods_id‘ => 10, ‘number‘ => 1, ), array( ‘user_id‘ => 102, ‘goods_id‘ => 10, ‘number‘ => 1, ),);$container = array();$result = array();foreach ($arr as $item) { $key = $item[‘user_id‘] . ‘_‘ . $item[‘goods_id‘];if (empty($container[$key])) {$container[$key] = $item[‘number‘]; }else { $container[$key] += $item[‘number‘]; }}foreach ($container as $key => $item) { list($user_id, $goods_id) = explode(‘_‘, $key);$result[] = array(‘user_id‘ => $user_id, ‘goods_id‘ => $goods_id, ‘number‘ => $item);}原文：http://www.cnblogs.com/xiaoqiangjun/p/7521451.html