<?php /** * 生成永远唯一的激活码 * @return string */ function create_guid($namespace = null) { static $guid = ''; $uid = uniqid ( "", true ); $data = $namespace; $data .= $_SERVER ['REQUEST_TIME']; // 请求那一刻的时间戳 $data .= $_SERVER ['HTTP_USER_AGENT']; // 获取访问者在用什么操作系统 $data .= $_SERVER ['SERVER_ADDR']; // 服务器IP $data .= $_SERVER ['SERVER_PORT']; // 端口号 $data .= $_SERVER ['REMOTE_ADDR']; // 远程IP $data .= $_SERVER ['REMOTE_PORT']; // 端口信息 $hash = strtoupper ( hash ( 'ripemd128', $uid . $guid . md5 ( $data ) ) ); $guid = '{' . substr ( $hash, 0, 8 ) . '-' . substr ( $hash, 8, 4 ) . '-' . substr ( $hash, 12, 4 ) . '-' . substr ( $hash, 16, 4 ) . '-' . substr ( $hash, 20, 12 ) . '}'; return $guid; } //使用 echo $key = create_guid ();
原文:http://blog.csdn.net/homevip/article/details/28113391