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我现在的凭据是正确的。

当我通过这样的表单发送图像时：(action="http://api.imageshack.com/v2/images/")。它工作正常但是当我尝试发送 $ch = curl_init($url); 它失败了。

代码：

enter code here
<form action="" method="post" enctype="multipart/form-data">
    Select image to upload:
    <input type="file" name="file" id="file" multiple>
    <input type="text" name="auth_token" id="auth_token" value="xxxxxxxxxxxxxxxx">
    <input type="text" name="api_key" id="api_key" value="xxxxxxxxxxxxxxx">

    <input type="submit" value="Upload Image" >
</form>

$url = ' http://api.imageshack.com/v2/images/ ';

    $temp = $_FILES["file"]['tmp_name'];

    echo $temp."<br>" ;

  $ch = curl_init($url);

    curl_setopt($ch, CURLOPT_POST, true);

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

    curl_setopt($ch, CURLOPT_TIMEOUT, 240);

    curl_setopt($ch, CURLOPT_POSTFIELDS, array( 
      'file'=> '@'.$temp, 
      "key" => "xxxxxxxxxxxxxxxxxxxx",
      "auth_token" => "xxxxxxxxxxxxxxx"          

      ));
curl_exec($ch);

我也尝试过使用 Header: curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

我从 imageshack 得到错误为 json: {"error_code":1,"error_message":"无效的图像文件。上传的文件未被检测为图像文件。","error_info":{"Content-Type":空，“文件大小”：0}}

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