How to encode/decode url in codeigniter - php

Question

I am sending a link to my user's email to activate his account by click that link.
example link:
http://test.com/welcome/make_active_user/($user_id)
then I encode $user_id in my controller, after that my link looks like the following one
http://test.com/welcome/make_active_user/17elQOjxrOXDsZdDZVFY7JFrB0TJFojdS+5OTpiIq/XXIaVrDfVWQ7xgOXXqGsURIFe/Udvm/XHrNWtbZXFA2g==
upto this everything is fine. Now i want to decode the $user_id,
but "/" symbol create problem. codeigniter took only those characters before the "/" symbol. How can i get a output of encoded user_id without "/"
I use "$this->encrypt->encode($user_id,$key);" in my controller
Please help

Answer 1

Just pass your encoded $user_id to the php function urlencode() before sending in a link like this:
$user_id_link = urlencode($user_id);
And decode the string you get back from the link with url decode() like this:
$user_id = urldecode($user_id_link);

Answer 2

You need to modify the encrypt class to encode url safe strings.
class MY_Encrypt extends CI_Encrypt
{
function encode($string, $key="", $url_safe=true)
{
$ret = parent::encode($string, $key);
if ($url_safe)
{
$ret = strtr(
$ret,
array(
'+' => '.',
'=' => '-',
'/' => '~'
)
);
}
return $ret;
}
function decode($string, $key="")
{
$string = strtr(
$string,
array(
'.' => '+',
'-' => '=',
'~' => '/'
)
);
return parent::decode($string, $key);
}
}
Then you can create a $url_safe link
Grab the encryption key from your config
$key = $this->config->item('encryption_key');
Create a url safe string by passing true as the third parameter
$encoded_url_safe_string = urlencode($this->encrypt->encode('secret', $key, true));
You will need to use rawurldecode to decode the string
$decoded_url_safe_string = rawurldecode($encoded_url_safe_string, $key);

Answer 3

I faced the same problem in the past, codeigniter encrypt->encode()has disallowed chars for URL but i did the following to solve the problem
first encode() your $user_id
simply replace the disallowed chars from the encrypted string with allowed one.
now before decoding replace those chars back to original one
decode() your $user_id
here is the code:
$this->encrypt->encode($user_id,$key);
$user_id = strtr($user_id,array('+' => '.', '=' => '-', '/' => '~'));
//your email body (link the user id here)
now time for decoding
$user_id = strtr($user_id,array('.' => '+', '-' => '=', '~' => '/'));
$this->encrypt->decode($user_id,$key);

Answer 4

I think your problem isn't with the '/', probably it's with '=' symbol.
To code and decode a url in CodeIgniter you can use any of this php native functions: http://php.net/manual/en/ref.url.php
But to avoid problems when decode the encoded url in CodeIgniter, you can add the special character that you require to use in each case (like '=' in your case) to $config['permitted_uri_chars'] in file application/config/config.php

Answer 5

Try This:
$query = urldecode($query);
$query = urlencode($query);