PHP function to generate random password string

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This is a great function to generate a random string of text. I use it for everything from automating the creation of passwords to generating mailing list unsubscribe id’s. The length of the string is determind by the variable $length. If you have any trouble using it please let me know.

<?php
function generate_rid($length=9)
{
$randomid = "";

//characters allowed
$allowed = "0123456789bcdfghjkmnpqrstvwxyz";

$i = 0;
// Loop until password string is the required length
while ($i < $length) 	{  		

// Select random character allowed string
$char = substr($allowed, mt_rand(0, strlen($allowed)-1), 1);

// Add random character to password string
$randomid .= $char;
$i  ; }	

// Return random password
return $randomid;

}

// Output - Use whatever length you want
print generate_rid($length=10);
?>

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