YOu can install XAMPP and save your file in htdocs folder and then run it on browser using localhost/appserve/index. php or you can download apache and its module for php and then set the path where you are saving your PHP file in order to execute them on browser.

Navigate to "localhost:8888" in your browser's address bar. The address bar is where you normally see "https://www." To do this, type "localhost:8888" and press ↵ Enter (Windows) or ⏎ Return (Mac). You'll see a directory of your PHP files displayed on the page. Click the PHP file to run the script in your browser.

At its most basic, index. php is the first file that will show up when a browser goes to the site or a directory. Beyond that, it can be used for whatever the site/project dictates. For more complicated sites or frameworks, it acts as the "boot" script.

The index.php file doesn't contain much code. Rather, it is a starting point for loading the rest of the framework. The index.php file loads the Composer generated autoloader definition, and then retrieves an instance of the Laravel application from bootstrap/app.php .