microtime()

[felito]

hi

this code will output an unique id like: 0.85760300 1319393114

 

$uniqueId= microtime();

echo $uniqueId;

 

my question is: how can i convert  this value to something like:

23/10/2001 19:06

?

 

thanks

[xyph]

mircotime is not a unique ID.

 

<?php 

list( $ms,$stamp ) = explode( ' ', microtime() );

echo date( 'd/m/Y h:i:s', $stamp ) . ' ' . $ms;

?>

[felito]

is not an unique id ?

 

I read that is also typically used for unique ID's.

 

This information is wrong ?

 

http://docstore.mik.ua/orelly/webprog/pcook/ch03_14.htm

[gizmola]

felito:

  Is it too hard for you to type in www.php.net/microtime?  Maybe you don't realize that the php manual works that way --- you put in the name of the function you want to read about in the url.  microtime 

 

There is a uniquid function.  That function uses microtime to seed a unique id generation algorithm.

 

 

Also... read the responses to your question.  Xyph took the time to reply to you with an example that answered your question about formatting of a time value.  Did you read it? 

 

 

 

If you want an id, then you are going to get something that has the property of uniqueness.  It is going to be a string, not a date/time value.  Do you want a date/time value or a unique string?

 

 

[xyph]

PHP implements microtime to help create a pseudo-unique value that has a very low chance of being replicated.

 

Using microtime alone generally isn't enough, as it's predictable.

 

And ideal solution would be to use microtime in combination with things like the users IP and very strong pseudo-random (or random if on a *nix system) data.

 

openssl_random_pseudo_bytes is great, but runs very slow on windows systems and isn't always available to use.

 

Using /dev/random on a *nix system ideal, as it uses environment noise for 'true' random generation.

 

As a worst-case fallback, mt_rand with a combination of the IP and microtime is generally enough, but know mt_rand is considered to be insecure cryptographically.

[felito]

thanks for your time xyph.