<span style="background-color:#f7faff;font-style:italic;">curl_setopt</span><span style="background-color:#f7faff;">(</span><span style="color:#660000;background-color:#f7faff;">$ch</span><span style="background-color:#f7faff;">,</span><span style="color:#660e7a;background-color:#f7faff;font-weight:bold;font-style:italic;">CURLOPT_URL</span><span style="background-color:#f7faff;">,</span><span style="color:#660000;background-color:#f7faff;">$this</span><span style="background-color:#f7faff;">-></span><span style="color:#660e7a;background-color:#f7faff;font-weight:bold;">upload_url</span><span style="background-color:#f7faff;">);<br /></span><span style="background-color:#f7faff;font-style:italic;">curl_setopt</span><span style="background-color:#f7faff;">(</span><span style="color:#660000;background-color:#f7faff;">$ch</span><span style="background-color:#f7faff;">,</span><span style="color:#660e7a;background-color:#f7faff;font-weight:bold;font-style:italic;">CURLOPT_POST</span><span style="background-color:#f7faff;">,</span><span style="color:#0000ff;background-color:#f7faff;">1</span><span style="background-color:#f7faff;">);<br /></span><span style="background-color:#f7faff;font-style:italic;">curl_setopt</span><span style="background-color:#f7faff;">(</span><span style="color:#660000;background-color:#f7faff;">$ch</span><span style="background-color:#f7faff;">,</span><span style="color:#660e7a;background-color:#f7faff;font-weight:bold;font-style:italic;">CURLOPT_POSTFIELDS</span><span style="background-color:#f7faff;">, </span><span style="color:#660000;background-color:#f7faff;">$file_fields</span><span style="background-color:#f7faff;">);<br /></span><span style="background-color:#f7faff;font-style:italic;">curl_setopt</span><span style="background-color:#f7faff;">(</span><span style="color:#660000;background-color:#f7faff;">$ch</span><span style="background-color:#f7faff;">,</span><span style="color:#660e7a;background-color:#f7faff;font-weight:bold;font-style:italic;">CURLOPT_SAFE_UPLOAD</span><span style="background-color:#f7faff;">, </span><span style="color:#000080;background-color:#f7faff;font-weight:bold;">false</span><span style="background-color:#f7faff;">);</span>

<span style="background-color:#f7faff;font-style:italic;">curl_setopt</span><span style="background-color:#f7faff;">(</span><span style="color:#660000;background-color:#f7faff;">$ch</span><span style="background-color:#f7faff;">,</span><span style="color:#660e7a;background-color:#f7faff;font-weight:bold;font-style:italic;">CURLOPT_POSTFIELDS</span><span style="background-color:#f7faff;">, </span><span style="color:#660000;background-color:#f7faff;">$file_fields</span><span style="background-color:#f7faff;">);<br /></span><span style="background-color:#f7faff;font-style:italic;">curl_setopt</span><span style="background-color:#f7faff;">(</span><span style="color:#660000;background-color:#f7faff;">$ch</span><span style="background-color:#f7faff;">,</span><span style="color:#660e7a;background-color:#f7faff;font-weight:bold;font-style:italic;">CURLOPT_SAFE_UPLOAD</span><span style="background-color:#f7faff;">, </span><span style="color:#000080;background-color:#f7faff;font-weight:bold;">false</span><span style="background-color:#f7faff;">);<br /></span><span style="background-color:#f7faff;font-style:italic;">curl_setopt</span><span style="background-color:#f7faff;">(</span><span style="color:#660000;background-color:#f7faff;">$ch</span><span style="background-color:#f7faff;">,</span><span style="color:#660e7a;background-color:#f7faff;font-weight:bold;font-style:italic;">CURLOPT_URL</span><span style="background-color:#f7faff;">,</span><span style="color:#660000;background-color:#f7faff;">$this</span><span style="background-color:#f7faff;">-></span><span style="color:#660e7a;background-color:#f7faff;font-weight:bold;">upload_url</span><span style="background-color:#f7faff;">);<br /></span><span style="background-color:#f7faff;font-style:italic;">curl_setopt</span><span style="background-color:#f7faff;">(</span><span style="color:#660000;background-color:#f7faff;">$ch</span><span style="background-color:#f7faff;">,</span><span style="color:#660e7a;background-color:#f7faff;font-weight:bold;font-style:italic;">CURLOPT_POST</span><span style="background-color:#f7faff;">,</span><span style="color:#0000ff;background-color:#f7faff;">1</span><span style="background-color:#f7faff;">);</span>

上面是2条使用curl上传文件的代码，虽然只是顺序发生了变化，但是下面的却不好用，主要是

CURLOPT_POSTFIELDS必须在CURLOPT_URL，CURLOPT_POST前面才能使用，这个应该是源代码中对文件上传做了一些处理导致的