users.class.php

	/**
	 * Generate a random string in [a-z0-9]
	 *
	 * @param Length
	 * @return random alphanumeric string
	 */
	public static function make_secret($Length = 32) {
		$Str = '';
		while (strlen($Str) < $Length) {
			$Hex = bin2hex(mcrypt_create_iv(10, MCRYPT_DEV_URANDOM));
			$Ascii = base_convert($Hex, 16, 36);
			$Str .= str_pad($Ascii, 16, '0', STR_PAD_LEFT);
		}
		return substr($Str, 0, $Length);
	}