PHP crypt command line

crypt

#!/usr/bin/php
< ?php
require "crypt.php";

$type = $argv['1'];
$string = $argv['2'];
$key = $argv['3'];
if($type !='' && $string != '' && $key != ''){
if($type=="e"){
echo encrypt($string,$key);
echo "\n";
}
elseif($type=="d")
{
echo decrypt($string,$key);
echo "\n";
}
else
{
die('WRONG TYPE');
}
}
else
{
echo 'crypt TYPE STRING KEY';
echo "\n\n";
echo "TYPE:\n";
echo "e encrypt\n";
echo "d decrypt\n";
echo "\n\n";
echo "STRING Your string\n";
echo "KEY Crypt key\n\n";
}
?>

crypt.php

< ?php
/**
* encrypt()
*
* @param mixed $string
* @param mixed $key
* @return mixed $retrun
*/
function encrypt($string, $key){

$result = '';
$lentgh = strlen($string);
for($i = 0; $i < $lentgh; $i++) {
$char = substr($string, $i, 1);
$keychar = substr($key, ($i % strlen($key))-1, 1);
$char = chr(ord($char) + ord($keychar));
$result .= $char;
}

return base64_encode($result);
}

/**
* decrypt()
*
* @param mixed $string
* @param mixed $key
* @return mixed $return
*/
function decrypt($string, $key){

$result = '';
$string = base64_decode($string);
$lentgh = strlen($string);

for($i = 0; $i < $lentgh; $i++) {
$char = substr($string, $i, 1);
$keychar = substr($key, ($i % strlen($key))-1, 1);
$char = chr(ord($char) - ord($keychar));
$result .= $char;
}

return $result;
}
?>