PHP URL encoding/decoding

Question

I used the accepted solution in this question to encrypt the id, for example in /index.php?id=3. The problem is that I cannot send the encrypted value as a url like /index.php?id=dsf13f3343f23/23=. Because sometimes there are strange characters in the URL, for example, pay attention to the = symbol

at the end

Answer 1

Use PHP's urlencode() function to encode the value before putting it in the URL.

This function converts "strange" characters, such as =, into a format that is safe to put in the URL. You can use it like this:

Header('Location: /index.php?id=' . urlencode($id))

Answer 2

Strange characters in the value passed in the URL should be escaped using urlencode().

For example, the following code snippet:

echo urlencode('dsf13f3343f23/23=');

will give:

dsf13f3343f23%2F23%3D

As a URL parameter, this is valid.

If you want to build a query string with multiple parameters, check out the
http_build_query() function.

For example:

echo http_build_query(array(
    'id' => 'dsf13f3343f23/23=',
    'a' => 'plop',
    'b' => '$^@test', 
));

will give:

id=dsf13f3343f23%2F23%3D&a=plop&b=%24%5E%40test

This function will automatically handle escaping and parameter splicing;-)