求大神指導一下

<code class="php">
//封装数据集合
$data = [];

foreach ($cart_id as $key => $val) {
    // 其他逻辑得到你想要的数据
    // 

    $service_name  = $serviceSqlResult['service_name']; 
    $service_price = $serviceSqlResult['service_price']; 
    $service_num   = $serviceSqlResult['service_num']; 
    $ipde_img      = $serviceSqlResult['ipde_img']; 
    $data[] = [
        'service_name'  => $service_name,
        'service_price' => $service_price,
        'service_num'   => $service_num,
        'ipde_img'      => $ipde_img,
    ];
}

//输出
echo json_encode($data);</code>