使用CURL上传图片至远程服务器（PHP >5.5）

开头引入 

use CURLFile; //curl文件上传

接收并上传

if ($_FILES){
 $data['file'] = new CURLFile($_FILES['file1']['tmp_name'],'image/jpeg',$_FILES['file1']['name']); //文件流 file1为表单中input的name

 $ch = curl_init();
 curl_setopt($ch, CURLOPT_URL,'upload.php'); //远程上传地址
 curl_setopt($ch, CURLOPT_POST,true);
 curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
 curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 1); //连接超时
 curl_setopt($ch, CURLOPT_POSTFIELDS,$data);
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); //不验证证书，下同
 curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false); //
 $res=curl_exec ($ch);
 //$info=curl_getinfo($ch); //请求详细信息
 curl_close($ch);
 return $res;

}else{
 echo '无文件';
}