PHP - Plus sign with GET query

Question

I have a PHP script that does basic encryption of a string through the method below:

Answer 1

If you'll read the entirety of that bug report you'll see a reference to RFC 2396. Which states that + is reserved. PHP is correct in translating an unencoded + sign to a space.

You could use urlencode() the ciphertext when returning it to the user. Thus, when the user submits the ciphertext for decryption, you can urldecode() it. PHP will do this automatically for you if it comes in via the GET string as well.

Bottom line: The + must be submitted to PHP as the encoded value: %2B