Ask PHP how to read the XML file into JSON format data, and JS how to parse the format of the data

This is the case, now I need to use jquery ajax to request a PHP file to get the content of an XML file, which needs to be loaded into JSON data issued
Because of not familiar with PHP, ask this function and JS receive the JSON data after how to parse code, by reference, the more detailed the better, thank you!
The following is the contents of the XML file

Reply to discussion (solution)

xml->php simplexml_load_file

Php->json Json_encode

Json->js Json2.js, var obj=json.parse (str); Or read directly with a For loop

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