Generate password/key that avoids user mistakes.

easier_password.php

<?php
/** 
 * Generate random password of given length.
 * 
 * @param int $length
 * @return string
 */
private function randomPassword($length = 6) {
	// Non-ambiguous chars
	$alphabet = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789';
	$alphamax = strlen($alphabet) - 1;

	$password = ''; 
	for ($i = 0; $i < $length; $i++) {
		$password .= $alphabet[mt_rand(0, $alphamax)];
	}   

	return $password;
}