What is XMLHttpRequest? Workaround

What is XMLHttpRequest??
XMLHttpRequest looked up some information that is a class in PHP, and some of it is a JavaScript object, it is the PHP system, or belong to the JavaScript system?

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XMLHttpRequest can provide updates to the Web page without reloading the page, after the page loads, the client requests data to the server, receives the data on the server side after the page loads, and sends the data to the client in the background. The XMLHttpRequest object provides full access to the HTTP protocol, including the ability to make POST and HEAD requests, as well as normal GET requests. XMLHttpRequest can return the response of the WEB server synchronously or asynchronously, and can return content as text or as a DOM document. Although named XMLHttpRequest, it is not limited to working with XML documents: It can receive any form of text document. The XMLHttpRequest object is a key feature of the WEB application architecture called AJAX.

The comparison of the dry zone is: Where did you see "Say a class in PHP"

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