Since PHP 4.x, there is a CLI SAPI web server. As a tester you simply go to the folder and start the server.

Example

# change to directory where server should start
$ cd /path/to/folder

# start server with specific port
$ php -S localhost:8100

Now start your browser and insert the URL “localhost:8100”. With “Ctrl+c” you can stop the server.

Extended

# explicit document root
$ cd /path/to/folder
$ php -S localhost:8100 -t foo/bar/

# specific configuration
$ cd /path/to/folder
$ php -S localhost:8100 -c php.ini