Use PHP'surlencode()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))

Strange charactersin the value passed in the URL should be escaped usingurlencode().

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;-)