Ajax Forms and how to save or print + and other special symbols successfully

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Sending special characters such as plus symbols through an AJAX form to be received the other end requires a bit of trickery. Often when programmers experience trouble with this kind of transmissions there was either

1. A lack of encoding on the JavaScript side.
2. The decode function on the PHP side was not good enough.
3. No encoding took place on either side.
4. No encoding took place on one of the two sides.

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