从Cloudinary序列化多个上传的图像

Question

我正在尝试将多个图像上传到Cloudinary。使用Ajax使用第二个php文件将数据写入sql。上载时还需要对数据进行序列化，显示时还需要将其反序列化。进行序列化的原因是，上传图像时，我需要更多信息，即安全url，原始文件名等。下面是写在下面的php文件中的代码片段。

 cloudinary.openUploadWidget({         
    cloud_name: 'username',
    upload_preset: 'preset',      
    sources: ['local', 'camera'], 
    multiple: true,}, 
function (error, result) {      
  console.log(error, result);  
  const eventData = result.data;
  if (result.event === "success") {
        var user_id = <?php echo $user['user_id']; ?>;         
        var image_name = result.info.original_filename;
        var image_url = result.info.secure_url;
        var thumbnail_url = result.info.thumbnail_url;
            $.ajax({
                url: "save.php",
                type: "POST",
                data: {
                  image_url : image_url,
                  image_name : image_name,
                  thumbnail_url : thumbnail_url,

                }
            });
        document.getElementById("images").innerHTML += '<li class="cloudinary-thumbnail active"><img src="'+result.info.thumbnail_url+'" data-src="'+result.info.thumbnail_url+'" ><input type="hidden" name="image_name[]" value="'+result.info.original_filename+'"><input type="hidden" name="image_url[]" value="'+result.info.secure_url+'"><h5>'+result.info.original_filename+'</h5></li>'; 
        }
});}, false);

这是save.php

    if ($_POST) {
    $user_id = $_POST['user_id'];
    $image_name = $_POST['image_name'];
    $image_url = $_POST['image_url'];
$thumbnail_url = $_POST['thumbnail_url'];
$arraylength = $_POST['arraylength'];
  $images = array();
    for ($i=0; $i < sizeof($image_name); $i++) { 
        $images[$i]['name'] = $image_name;
        $images[$i]['url'] = $image_url;
  $images[$i]['thumbnail_url'] = $thumbnail_url;
    };


    try {
        $stmt = $db->prepare("UPDATE images_collection SET images = :images WHERE user_id = :user_id");
        $stmt->execute(array(
            ':images'=>serialize($images),
            ':user_id'=>$user_id
        ));
        echo "true";
    } catch (PDOException $e) {
        echo $e->getMessage();
    }

}