AJAX requests and PHP responses

Thomas Mak wrote at 2017-04-20.

JavaScript sends requests to PHP through internet.
PHP handle the requests with parameters from $_GET or $_POST.
PHP has the $data, either from database or other data sources.
PHP includes essential external PHP files and functions to complete the logic.
PHP sends processed data in JSON response via echo and json_encode.
Response is sent back to JavaScript through internet.
JavaScript handles the data from PHP.
JavaScript changes HTML DOM structure and content via clone, append, text etc to display the data.

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