What PHP function will create a random string of letters and numbers?

here is one I use. It is based from time so no two file names can be the same. It is an out put of 32 characters but you can shorten it.

$The_File = "yourfilename.gif";
function my_file_name($TheFile){
$new_file_name = md5($The_File . time());
}

and to shorten it
$new_file_name = substr(md5($The_File . time()),0,15);

or to keep a few letter of the original file name etc.

$new_file_name = substr($The_File,0,5) . substr(md5($The_File . time()),0,15);

The important part is the time(); this is the same thing as date("U");
 
you can call it anything you want

randomizeLettersAndNumbers()
{
// code here
}
 
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