第一种
md5(time() . mt_rand(1,1000000)
第二种
<?php
echo uniqid();
echo uniqid();
echo uniqid();
?>
分别输出:
4bfd0e375396b
4bfd0e3753981
4bfd0e3753983
第三种
<?php
echo md5(uniqid());
?>
输出:dfbc5c8c6438de075da28b3c8a413fd0
第四种
官方给予的案例
public function create_guid($namespace = '') {
static $guid = '';
$uid = uniqid("", true);
$data = $namespace;
$data .= $_SERVER['REQUEST_TIME'];
$data .= $_SERVER['HTTP_USER_AGENT'];
$data .= $_SERVER['LOCAL_ADDR'];
$data .= $_SERVER['LOCAL_PORT'];
$data .= $_SERVER['REMOTE_ADDR'];
$data .= $_SERVER['REMOTE_PORT'];
$hash = strtoupper(hash('ripemd128', $uid . $guid . md5($data)));
$guid = '{' .
substr($hash, 0, 8) .
'-' .
substr($hash, 8, 4) .
'-' .
substr($hash, 12, 4) .
'-' .
substr($hash, 16, 4) .
'-' .
substr($hash, 20, 12) .
'}';
return $guid;
}
返回结果类似:E2DFFFB3-571E-6CFC-4B5C-9FEDAAF2EFD7