Ajax帖子在服务器上具有空值 [英] Ajax post has empty values on the server

问题描述

我正在尝试从客户端接收的base64字符串中保存图像文件.

I'm trying to save an image file out of a base64 string received from the client side.

所以我有这个ajax帖子:

So I have this ajax post:

 $.ajax({type: "POST", url: "upload_post.php", data: postData, dataType: "text", success: function(result){
        alert("post result: " + result + " - data:" + postData);
        location.reload();
    }});

这是postData(我知道其中包含数据)的示例:

Here is an example of postData (which I know contains data):

{"ship_id":"407","base64_upload":"ABCSFSAFGDGFA....."}

现在这是处理该帖子的我的php代码:

Now here is a my php code that handles this post:

$id = $_POST['ship_id'];
$img = $_POST['base64_upload'];
define('UPLOAD_DIR', 'news.site.com/docs/'.$id.'/');
$img = str_replace('data:image/png;base64,', '', $img);
$img = str_replace(' ', '+', $img);
$data = base64_decode($img);
$file = UPLOAD_DIR . uniqid() . '.png';
$success = file_put_contents($file, $data);
print $success ? $file : 'Unable to save the file. '.$file.'';

问题是$ _POST变量始终为空.这是为什么? json相关吗? location.reload()相关吗?以及如何解决?

The problem is the $_POST variables are always empty. why is that? json related? location.reload() related? and how do I fix it?

编辑

通过对ajax数据执行JSON.parse(postData)，我将这些变量与实际数据一起发布.现在我的问题是我仍然无法保存图像文件.有帮助吗?

I have got these variables posted with actual data by doing JSON.parse(postData) on the ajax data. Now my problem is I still can't save the image file. any help?

推荐答案

我再次回答了自己的问题. 问题是我有define('UPLOAD_DIR', 'news.site.com/docs/'.$id.'/'); 然后$file = UPLOAD_DIR . uniqid() . '.png';，此UPLOAD_DIR目录实际上并不存在.因此，我添加了一个检查是否存在，然后在创建文件之前创建了目录:

Once again, I'm answering my own question. The problem was I have define('UPLOAD_DIR', 'news.site.com/docs/'.$id.'/'); and then $file = UPLOAD_DIR . uniqid() . '.png'; and this UPLOAD_DIR directory doesn't really exists. So I added a check if it exists and then created the directory before creating the file:

$id = $_POST['ship_id'];
$img = $_POST['base64_upload'];
define('UPLOAD_DIR', 'news.site.com/docs/'.$id.'/');
$file2 = UPLOAD_DIR;
if(!file_exists($file2)){
    mkdir($file2, 0777, true);
    $img = str_replace('data:image/png;base64,', '', $img);
    $img = str_replace(' ', '+', $img);
    $data = base64_decode($img);
    $file = UPLOAD_DIR . uniqid() . '.png';
    $success = file_put_contents($file, $data);
    print $success ? $file : 'Unable to save the file. '.$file.'';
}

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