This depends on the keyboard layout you are using. The AltGr (Right Alt) works as Ctrl+Alt in US International Layout whereas it works as Normal Alt key in US English layout. It is very important in clavier that you use it as Ctrl+Alt
Download php7cc.phar from https: //github .com /sstalle/php7cc/releases/download/1 .1.0 /php7cc .phar and save it in the root of wamp. (Where you keep all your projects) Then open the command prompt and proceed as given below. Replace the paths according to your system. You will find a detailed report in the specified report file.