PHP Generate random password

From JumbaWiki

This is a simple PHP function that generates a random password. To call the function simply run createPassword(8); - to define how many characters you want in the password, enter the number in the function call, eg. createPassword(10);. (from http://www.totallyphp.co.uk)

Note: The letter l (lowercase L) and the number 1 have been removed from the possible options as they are commonly mistaken for each other.

<?php
function createPassword($length) {
	$chars = "234567890abcdefghijkmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
	$i = 0;
	$password = "";
	while ($i <= $length) {
		$password .= $chars{mt_rand(0,strlen($chars))};
		$i++;
	}
	return $password;
}
 
$password = createPassword(8);
echo "Your 8 character password is: $password";
 
?>

Code contributed by Thewebdruid, for the Jumba Wiki

Here's another variation that accepts a second (optional) parameter, allowing you to specify what kind of characters the password can contain:

<?
 function RandomPassword($PwdLength=8, $PwdType='standard')
    {
    // $PwdType can be one of these:
    //    test .. .. .. always returns the same password = "test"
    //    any  .. .. .. returns a random password, which can contain strange characters
    //    alphanum . .. returns a random password containing alphanumerics only
    //    standard . .. same as alphanum, but not including l10O (lower L, one, zero, upper O)
    //
    $Ranges='';
 
    if('test'==$PwdType)         return 'test';
    elseif('standard'==$PwdType) $Ranges='65-78,80-90,97-107,109-122,50-57';
    elseif('alphanum'==$PwdType) $Ranges='65-90,97-122,48-57';
    elseif('any'==$PwdType)      $Ranges='40-59,61-91,93-126';
 
    if($Ranges<>'')
        {
        $Range=explode(',',$Ranges);
        $NumRanges=count($Range);
        mt_srand(time()); //not required after PHP v4.2.0
        $p='';
        for ($i = 1; $i <= $PwdLength; $i++)
            {
            $r=mt_rand(0,$NumRanges-1);
            list($min,$max)=explode('-',$Range[$r]);
            $p.=chr(mt_rand($min,$max));
            }
        return $p;			
        }
    }
 
 
 // TEST SCRIPT
 $numchar=9;
 foreach(array('standard','alphanum','any','test') as $type) 
    {
    echo "<br /><br />Sample $numchar character \"$type\" password:<br />&nbsp; &nbsp; ";
    echo RandomPassword($numchar,$type);
 }
 
?>

See also

• Code Snippets
• PHP
• PHP Basics
• Generate random number

External Links

Online Random Password Generator