PHP GUID的生成源码

<?php
function guid(){
if (function_exists('com_create_guid')){
return com_create_guid();
}else{
mt_srand((double)microtime()*10000);//optional for php 4.2.0 and up.
$charid = strtoupper(md5(uniqid(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;
}
}
echo guid();//{26E69265-078C-C7D9-A0CA-33348CEEE712}
function create_guid() {
$charid = strtoupper(md5(uniqid(mt_rand(), true)));
$hyphen = chr(45);// "-"
$uuid =
substr($charid, 0, 8)
.substr($charid, 8, 4)
.substr($charid,12, 4)
.substr($charid,16, 4)
;
return $uuid;
}
echo create_guid();//927D69607CC9DF2160B1
?>