PHP: Simple random password generator

functions.php

<?php
function randomPassword($length = 10) {
	$alphabet = 'abcdefghijklmnopqrstuwxyzABCDEFGHIJKLMNOPQRSTUWXYZ0123456789';
	$pass = array(); //remember to declare $pass as an array
	$alphaLength = strlen($alphabet) - 1; //put the length -1 in cache
	
	for ($i = 0; $i < $length; $i++) {
		$n = rand(0, $alphaLength);
		$pass = $alphabet[$n];
	}
	
	return implode($pass); //turn the array into a string
}