<?php

/**

 * 从来没有产生一个唯一的激活码

 * @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']; 	// 获取訪问者在用什么操作系统

	$data .= $_SERVER ['SERVER_ADDR']; 		// serverIP

	$data .= $_SERVER ['SERVER_PORT']; 		// port号

	$data .= $_SERVER ['REMOTE_ADDR']; 		// 远程IP

	$data .= $_SERVER ['REMOTE_PORT']; 		// port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 ();