Set a button, click on the self-increment

I want to set the number of items in the shopping cart as a button, and automatically add them by clicking on them.
How to write this PHP language.

Reply to discussion (solution)

This is best to use JS to write, PHP can use AJAX+JS to achieve click Self-increment

To use JS to write AH button binding an event Click to trigger the self-increment event

This is the effect of jquery, it's nothing to do with PHP.
Http://www.cnblogs.com/wifi/articles/2587746.html

This should be written in JS. Last submitted to PHP

Js:

Form:

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