function guid(){
if (function_exists('com_create_guid')){
return com_create_guid();
}else {
mt_srand((double)microtime()*10000);//php 4.2.0 及以上版本可选。
$charid = strtoupper(md5(uniqid(rand(), true)));
$hyphen = chr(45);// "-"
$uuid = chr(123)// "{"
.substr($charid, 0, 8).$hyphen
.substr ($charid, 8, 4).$连字符
.substr($charid,12, 4).$连字符
.substr($charid,16, 4).$连字符
.substr($ Charid,20,12)
.chr(125);// "}"
return $uuid;
}
}
