https://developers.weixin.qq.com/doc/offiaccount/Asset_Management/Adding_Permanent_Assets.html php7.4上传素材时，错误时正常返回，正常提交，返回为空。

php7.4使用curl上传临时素材，API返回空白（The requested URL returned error: 412 Precondition Failed），http状态码412 https://developers.weixin.qq.com/doc/offiaccount/Asset_Management/New_temporary_materials.html 同样的反馈帖子： https://developers.weixin.qq.com/community/develop/doc/000a6ca7ae4988a4d9f949d4456800 https://developers.weixin.qq.com/community/develop/doc/0004089f8d078823aef9b63655b400 <?php     # 下面是我的测试代码：     $url = 'https://api.weixin.qq.com/cgi-bin/media/upload?access_token=...&type=image';     $data = [         'media' => new CURLFile('F:\web\30101441194a79ab.jpg')     ];     $ch = curl_init();     curl_setopt($ch, CURLOPT_URL, $url);     curl_setopt($ch, CURLOPT_POST, true);     curl_setopt($ch, CURLOPT_POSTFIELDS, $data);     curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);     curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);     curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);     $res= curl_exec($ch);     $info = curl_getinfo($ch);     curl_close($ch);     echo '<pre>';     var_dump($res);     var_dump($info);     echo '</pre>'; ?>