php5.6关于curl以＠方式上传文件的变化及解决七牛上传时报file is not specified in multipart的问题

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1.         $ch = curl_init ();  
2.         $fields = $params;  
3.         $fields ['file'] = '@' . $file;  
4.         curl_setopt ( $ch, CURLOPT_URL, $url );  
5.         curl_setopt ( $ch, CURLOPT_POST, 1 );  
6.         curl_setopt ( $ch, CURLOPT_POSTFIELDS, $fields );  
7.         curl_setopt ( $ch, CURLOPT_RETURNTRANSFER, 1 );  
8.         $response = curl_exec ( $ch );  

        $ch = curl_init ();        $fields = $params;        $fields ['file'] = '@' . $file;        curl_setopt ( $ch, CURLOPT_URL, $url );        curl_setopt ( $ch, CURLOPT_POST, 1 );        curl_setopt ( $ch, CURLOPT_POSTFIELDS, $fields );        curl_setopt ( $ch, CURLOPT_RETURNTRANSFER, 1 );        $response = curl_exec ( $ch );

在php5.6之前的版本上以上面的代码上传文件是没有问题的，但从php5.6.0开始，需要加上curl_setopt ( $ch, CURLOPT_SAFE_UPLOAD, false);这行代码方可上传，否则取不到文件。

最终的代码：

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1.         $ch = curl_init ();  
2.         curl_setopt ( $ch, CURLOPT_SAFE_UPLOAD, false);  
3.         $fields = $params;  
4.         $fields ['file'] = '@' . $file;  
5.         curl_setopt ( $ch, CURLOPT_URL, $url );  
6.         curl_setopt ( $ch, CURLOPT_POST, 1 );  
7.         curl_setopt ( $ch, CURLOPT_POSTFIELDS, $fields );  
8.         curl_setopt ( $ch, CURLOPT_RETURNTRANSFER, 1 );  
9.         $response = curl_exec ( $ch );  

        $ch = curl_init ();        curl_setopt ( $ch, CURLOPT_SAFE_UPLOAD, false);        $fields = $params;        $fields ['file'] = '@' . $file;        curl_setopt ( $ch, CURLOPT_URL, $url );        curl_setopt ( $ch, CURLOPT_POST, 1 );        curl_setopt ( $ch, CURLOPT_POSTFIELDS, $fields );        curl_setopt ( $ch, CURLOPT_RETURNTRANSFER, 1 );        $response = curl_exec ( $ch );

注意：curl_setopt ( $ch, CURLOPT_SAFE_UPLOAD, false);这行代码必须放在下面这行代码之前<pre name="code" class="plain">curl_setopt ( $ch, CURLOPT_POSTFIELDS, $fields );否则上传到七牛时会报file is not specified in multipart的错误。

PHP官网上也有此介绍http://cn2.php.NET/manual/en/function.curl-setopt.php