Modify php "Earn Credits System" on Facebook App

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
There is a php virtual currency system on my Facebook App where users must earn credits to play the next round of the game.I would like some modifications to the system that include linking the credit balance/earnings to game actions and the ability to edit credit values in my admin.

I also want to modify some text submission forms to exclude some unwanted characters e.g html code and also limit the number of characters that can be submitted.

The last task is adding an extra button to the app,that does not include the share option.

This should be a simple task for a PHP & MySQL expert.My budget is very limited to less than $40

Skills required:
Facebook Marketing, MySQL, PHP
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