GuardiansWorlds.com >> PHP Manual 2007

PHP Manual

uniqid

(PHP 3, PHP 4, PHP 5)

uniqid -- Generate a unique ID

Description

string uniqid ( [string prefix [, bool more_entropy]] )

uniqid() returns a prefixed unique identifier based on the current time in microseconds. prefix became optional in PHP 5 but can be useful, for instance, if you generate identifiers simultaneously on several hosts that might happen to generate the identifier at the same microsecond. Up until PHP 4.3.1, prefix could only be a maximum of 114 characters long.

If the optional more_entropy parameter is TRUE, uniqid() will add additional entropy (using the combined linear congruential generator) at the end of the return value, which should make the results more unique.

With an empty prefix, the returned string will be 13 characters long. If more_entropy is TRUE, it will be 23 characters.

Note: The prefix parameter is required before PHP 5.

If you need a unique identifier or token and you intend to give out that token to the user via the network (i.e. session cookies), it is recommended that you use something along these lines:


<?php
// no prefix
// works only in PHP 5 and later versions
$token = md5(uniqid());

// better, difficult to guess
$better_token = md5(uniqid(rand(), true));
?>

This will create a 32 character identifier (a 128 bit hex number) that is extremely difficult to predict.

Prev	Home	Next
time_sleep_until	Up	unpack


	All logos and trademarks in this site are property of their respective owner. The comments are property of their posters, all the rest © 2002 by me. You can syndicate our news using the file backend.php or ultramode.txt This site contains info,links,chat,message board/forum for online games,gaming,other features.Check out my servers and stats for Killing Floor, Quake3 Rocket Arenas & Deathmatch,Trade Wars 2002 & FTP server.Camaro/Firebirds, car info.