GUID,UUID

<?
class  System
{
                function  currentTimeMillis()
                {
                                list($usec,  $sec)  =  explode("  ",microtime());
                                return  $sec.substr($usec,  2,  3);
                }
}
class  NetAddress
{
                var  $Name  =  'localhost';
                var  $IP  =  '127.0.0.1';
                function  getLocalHost()  //  static
                {
                                $address  =  new  NetAddress();
                                $address->Name  =  $_ENV["COMPUTERNAME"];
                                $address->IP  =  $_SERVER["SERVER_ADDR"];
                                return  $address;
                }
                function  toString()
                {
                                return  strtolower($this->Name.'/'.$this->IP);
                }
}
class  Random
{
                function  nextLong()
                {
                                $tmp  =  rand(0,1)?'-':'';
                                return  $tmp.rand(1000,  9999).rand(1000,  9999).rand(1000,  9999).rand(100,  999).rand(100,  999);
                }
}
//  三段
//  一段是微秒  一段是地址  一段是随机数
class  Guid
{
                var  $valueBeforeMD5;
                var  $valueAfterMD5;
                function  Guid()
                {
                                $this->getGuid();
                }
//
                function  getGuid()
                {
                                $address  =  NetAddress::getLocalHost();
                                $this->valueBeforeMD5  =  $address->toString().':'.System::currentTimeMillis().':'.Random::nextLong();
                                $this->valueAfterMD5  =  md5($this->valueBeforeMD5);
                }
                function  newGuid()
                {
                                $Guid  =  new  Guid();
                                return  $Guid;
                }
                function  toString()
                {
                                $raw  =  strtoupper($this->valueAfterMD5);
                                return  substr($raw,0,8).'-'.substr($raw,8,4).'-'.substr($raw,12,4).'-'.substr($raw,16,4).'-'.substr($raw,20);
                }
}
?>

引用：

include"上面文件";
$Guid = new Guid();
$id = $Guid->toString();