Php And Javascript Together

One of the most powerful aspects of any web application is the ability to obtain information from a database and pass it to a web browser and then send any updated data back again. Typically a web page may send a request to a server, then that request can then be processed on the server and then the result is returned to the web browser.

So, for example: a Javascript program may send a request for information to a server via Ajax; the request is processed by a PHP script which queries a MySQL database; the PHP script returns an output in HTML; the Javascript program updates the innerHTML of a div block with the HTML code returned by the PHP script. And, in this example, all of the work is done by the server. However, it is possible to spread the load by returning the data in JSON format and enabling the client to do some of the work.

Converting MySQL Data To a JSON Object

The process for converting a set of MySQL records into a JSON object is quit simple: the Javascript program sends an Ajax request to a PHP script; the PHP script sends a query to the MySQL database and turns the result into a JSON format string; the PHP script returns the string to the Javascript program; the Javascript program converts the JSON format string into a JSON object and processes it as required.

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