做个记录

<?php function PrivateKeyA(){
$time=strtotime("+10 minute");

$key="ym740c81faj4u89xyz";    //鉴权密钥（限制6~32位字符，由大小写字母或数字组成)

$filename="/2.jpg";

//$sstring = "URI-Timestamp-rand-uid-PrivateKey"

$sstring = $filename."-".$time."-0-0-".$key;

$md5=md5($sstring);

$auth_key="sign=".$time."-0-0-".$md5;

$url="https://test.file.qcloud.com".$domain.$filename."?".$auth_key."&imageMogr2/thumbnail/!50p";

echo $url."\n";

}

PrivateKeyA();