function create_guid() {
$charid = strtoupper(md5(uniqid(mt_rand(), true)));
$hyphen = chr(45);// "-"
$uuid = chr(123)// "{"
.substr($charid, 0, 8).$hyphen
.substr($charid, 8, 4).$hyphen
.substr($charid,12, 4).$hyphen
.substr($charid,16, 4).$hyphen
.substr($charid,20,12)
.chr(125);// "}"
return $uuid;
}
PHP生成 GUID全球唯一标识符
原文地址：http://www.cnblogs.com/supreme-H/p/7587762.html