Design Pattern Tutorials
Flyweight pattern shares basic object resources to generate a large number of objects efficiently. Flyweight pattern is used to reduce memory footprint. This article demonstrates Flyweight pattern implementations in PHP.
Proxy pattern is used provide a placeholder or surrogate for an original object. Operation performed the proxy, calls operation(s) from the original object. This proxy object existing between the client and the original object to provide security and/or access control and/or additional functionality. This article demonstrates Proxy pattern implementations in PHP.
Chain of Responsibility pattern gives responsibility of a process handling to more than one object(a chain of objects) so that the sender and receiver of the request remains decoupled. The chain of objects pushes the processing to the next step until the processing is complete. This article demonstrates Chain of Responsibility pattern implementations in PHP.
Command pattern encapsulates a full request in an object. So, the object can be passed as a parameter or can be queued or saved in log. Later the object can be revived and we get the full request, which can be executed and/or undoned at any point in time. This article demonstrates Command pattern implementations in PHP.
Iterator pattern is used to access items sequentially from an aggregated object. The client does not need to know the underlying details of the iterator, it can just use the iterator easily. This pattern makes it very easy for the client to traverse through a list of objects, one by one. It can also implement the traversing process in any order (ascending or descending) if required. This article demonstrates the Iterator pattern implementation in PHP.
Interpreter pattern represents the grammar or syntax rules of an expression. Parsing the expression and evaluation is implemented in the pattern implementation. The implementation can be for a specific syntax of a specific type of expression. A specific set of rules is defined for parsing and evaluation/operation. In this article, we are discussing the implementation of the Interpreter pattern in PHP.
Mediator pattern encapsulates the logic of communication between a bunch of defined objects. A mediator object is used for that. The mediator works as a middleman between the set of objects. This prevents the objects(colleagues) from communicating directly with each other, and ensures loose coupling. This article demonstrates Mediator pattern implementations in PHP.
Memento pattern keeps track of the internal state of an object, so that the program can track back and restore to any previous state of the object. This pattern enables us to implement the undo of any state change. This article demonstrates Memento pattern implementations in PHP.
Observer pattern implements a publish/subscribe mechanism between objects. Some subscribing objects want to observe the state change of a specific object, and the observer pattern enables the publishing object(subject) to notify other objects about changes. This article demonstrates Observer pattern implementations in PHP.
State pattern implements a system where an object is able to change its behavior based on state(one or more properties) of that object. The behavior can change completely or partially. This article demonstrates State pattern implementations in PHP.
