PHP Infinite loop to get data (or message) information

PHP Infinite loop gets data (or message) information
I do not know PHP basically, because the project needs, I need to put JSP write live chat system embedded in PHP.
The only remaining question now is how to get the data in the frame (because the customer service will be asked to pop up the invitation chat at any time, so you need an invalid loop or message), and want to ask if PHP has an infinite loop and the interface will not use the card master (or any other time to get the data once)

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Jquery

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