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Submitting a form via AJAX using jQuery, PHP and JSON

My buddy Chris asked for some help the other day on submitting a contact form via AJAX. We had a debate on the best structure for doing so and I explained about using JSON for the AJAX response message from the form processing script. My preferred method is submitting a form via AJAX to a PHP script for processing the form. The PHP script returns a JSON response with whether the form submission was a success or not. I thought this would be a good tutorial so I whipped up a quick sample for everyone.

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