PHP生圆成球唯一码

PHP生成全球唯一码

<? function guid() {	$charid = strtoupper(md5(uniqid(mt_rand(), true)));	$uuid =	substr($charid, 0, 8).	substr($charid, 8, 4). 	substr($charid,12, 4).	substr($charid,16, 4).	substr($charid,20,12); 	return $uuid; } echo strlen(guid());?>