In a traditional 3 tier architecture, the tiers include Web Server, App Server & Database Server. The Webserver holds the UI(User Interface), App Server holds Business Logic (Application) and Database Server holds Actual Data
Client, Middleware, Server
Client, Middleware, Server
Client-Server model is a form of 2 Tier architecture in PHP. With use of database it becomes a 3 Tier architecture
At first glance, the three tiers may seem similar to the model-view-controller (MVC) concept; however, topologically they are different. A fundamental rule in a three tier architecture is the client tier never communicates directly with the data tier; in a three-tier model all communication must pass through the middle tier. Conceptually the three-tier architecture is linear. However, the MVC architecture is triangular: the view sends updates to the controller, the controller updates the model, and the view gets updated directly from the model.
There are three tiers to the Federal court system. The first tier is the trial court. The second tier is the appellate court, and the third tier is the United States Supreme court consists of three tiers.
PHP is a scripting language and does not follow a 3-tier architecture. However, there are several popular frameworks which follow the MVC architecture:Zend FrameworkCakeSymfonyCodeIgniter
In 3 tier architecture, client directly interacts with intermediate server and intermediate server will directly interact with database server.
In 3 tier architecture, client directly interacts with intermediate server and intermediate server will directly interact with database server.
3-tier architecture
From the Store, there is a "Runes" tab. There are three tiers of runes. Tier 1-3, with 3 being the strongest rune. You buy them with IP, and use them in your Rune Book. Remember though; you have to be level 20 to even buy tier 3 runes.
"Tiers" are the item levels. Potions at Tier 1 restore less HP then those of Tier 2. Tier 1 potions heal 250 HP while those of Tier 3 can heal 1250. Basically, the higher the tier the stronger that item is.
real-time 3-tier architecture .