How to The `php` command cannot be found. Please verify that PHP is installed, or set the `php.executables` setting. (PHP Scripting Language)

Open Settings.json and put this codes below: for wamp users

php.validate.executablePath: C:\\wamp64\\bin\\php\\php7.1.9\\php.exe,

  php.executablePath: C:\\wamp64\\bin\\php\\php7.1.9\\php.exe

Open settings.json and put this code below for xampp users  

php.validate.executablePath: C:\\xampp\\php\\php.exe,

  php.executablePath: C:\\xampp\\php\\php.exe

Step 1 - Go to 'Environmental Variables'.

Step 2 - Find PATH variable and add the path to your PHP folder.

Step 3 - For 'XAMPP' users put 'C:\xampp\php' and 'WAMP' users put 'C:\wamp64\bin\php\php7.1.9' ) and save.