Moving a command-line PHP Rock Paper Scissors game to the Browser
Rock-paper-scissors chart (Photo credit: Wikipedia)
In the first part we saw an example for creating a PHP Rock Paper Scissors game that waits for user input via the command-line and then evaluates the output of the game. Next we see an example for porting our basic command-line PHP Rock Paper Scissors game to the browser to reach a broader audience, since well, not that many people play command-line games these days.
Benefits of the Browser
With a Browser we have a few more useful tools at our disposal, as we can start to keep track of games played (wins/losses) over the lifetime of a particular user session. We also have the potential to open up the game to multiplayer more easily, as a player could play against others if we added a login mechanism (while a proper multi-user session persistence and secure login/logout mechanism is outside the scope of this example, a simple demo will be presented for enabling “play against a friend” mode with unique Game IDs).
Sessions
Sessions in PHP combine the use of short-term server-side persistence which lasts the lifetime of the page our code sits on, in combination with Cookies to extend that lifetime beyond an accidental page reload or tab close so that a session can be resumed. When you use a Session you’ll get a session ID of the name:
PHPSESSID
With a long unique alphanumeric identifier, such as:
49cdf231ddf8502e307c437ef98fd632
The Cookie representing this name/value pair looks roughly as follows (as viewed in the CookieManager+ plugin for FireFox):
In raw text that Cookie would look simply like this:
PHPSESSID=hfdvcdrj8hr6p6blkg9tt00av6; path=/; domain=gtk.php.net
And the value will be passed with each request from the client to the server along with the regular HTTP Headers (User-Agent, etc), in order to identify our device/browser/OS combination. It looks like this:
| Accept | text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 |
| Accept-Encoding | gzip, deflate |
| Accept-Language | en-US,en;q=0.5 |
| Connection | keep-alive |
| Cookie | PHPSESSID=hfdvcdrj8hr6p6blkg9tt00av6; LAST_LANG=en; COUNTRY=NA%2C156.34.241.222 |
| Host | gtk.php.net |
| Upgrade-Insecure-Requests | 1 |
| User-Agent | Mozilla/5.0 (Windows NT 10.0; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0 |
Multiplayer
Multiplayer in the traditional sense would require a scalable, dedicated server for connecting large pools of users or a sophisticated P2P routing algorithm. Ideally, these days, a P2P networking solution would be used to enable direct communication between the parties playing a game together.
See the other parts here:
- Part 1: Creating a basic Rock Paper Scissors game in PHP
- Part 2: Moving a command-line PHP Rock Paper Scissors game to the Browser <– you are here
- Part 3: Exposing your PHP Rock Paper Scissors game via SOAP Web Services
- Part 4: Integrate PHP based SOAP RPS game server in another language, JAVA desktop GUI