The browser has to be reloaded everytime the php file is modified. To make it automatic, install Live Server extension in Chrome Web Store. After that click the extension and enable live reload then ...
"php.validate.executablePath": "C:/xampp/php/php.exe", "phpserver.phpPath": "C:\\xampp\\php\\php.exe", "phpserver.phpConfigPath": "C:\\xampp\\php\\php.ini" ...