七牛支持抓取远程图片 API，用 access_key + secret_key + url 生成 access_token, 把 access_token 加在 header 里，然后向 post url 就完成上传了。

Sample code:

<?php /*  *  * @desc URL安全形式的base64编码  * @param string $str  * @return string  */   function urlsafe_base64_encode($str){   $find = array("+","/");   $replace = array("-", "_");   return str_replace($find, $replace, base64_encode($str)); }  /**  * generate_access_token  *  * @desc 签名运算  * @param string $access_key  * @param string $secret_key  * @param string $url  * @param array $params  * @return string  */ function generate_access_token($access_key, $secret_key, $url, $params = ""){   $parsed_url = parse_url($url);   $path = $parsed_url["path"];   $access = $path;   if (isset($parsed_url["query"])) {     $access .= "?" . $parsed_url["query"];   }   $access .= "";   if($params){     if (is_array($params)){       $params = http_build_query($params);     }     $access .= $params;   }   $digest = hash_hmac("sha1", $access, $secret_key, true);   return $access_key.":".urlsafe_base64_encode($digest); }  /**  * 测试  */  $access_key = """your access_key"; $secret_key = "your secret_key";  $fetch = urlsafe_base64_encode("http://203.208.46.200/images/srpr/logo11w.png"); $to = urlsafe_base64_encode("ibeircn:11.jpg");  $url = "http://iovip.qbox.me/fetch/". $fetch ."/to/" . $to;  $access_token = generate_access_token($access_key, $secret_key, $url);  $header[] = "Content-Type: application/json"; $header[] = "Authorization: QBox ". $access_token;   $con = send("iovip.qbox.me/fetch/".$fetch."/to/".$to, $header); var_dump($con);  function send($url, $header = "") {   $curl = curl_init($url);   curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);   curl_setopt($curl, CURLOPT_HEADER,1);   curl_setopt($curl, CURLOPT_HTTPHEADER, $header);   curl_setopt($curl, CURLOPT_POST, 1);    $con = curl_exec($curl);    if ($con === false) {     echo "CURL ERROR: " . curl_error($curl);   } else {     return $con;   } } ?> 

以上所述就是本文的全部内容了，希望大家能够喜欢。