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An in-depth analysis of the structural pattern of PHP design patterns_PHP tutorial
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- 2016-07-21 15:07:07882browse
There are many similarities between structural patterns because there are several relationships in the object model structure: inheritance and implementation between classes, plus object composition, which are the main purposes of PHP design patterns.
The biggest advantage of object composition is that a relationship can be established based on configuration at runtime without modifying the actual code. It is an operation required for class inheritance and interface implementation. In fact, you can define the functionality of an application by modifying the links between objects rather than between classes, which is part of the design.
List of structural patterns
Adapter-Bridge-Facade
The goal of these three modes is competitive coupling:
◆Adapter mode (Adapter) uses different interfaces to connect objects;
◆Bridge mode (Bridge) Separate an M abstraction layer and an N implementation layer into N+M classes instead of M*N usage;
◆Facade creates a new unified interface to access subsystems.
Composite-Decorator-Proxy
These three patterns maintain the same object interface, and they add orthogonal concerns transparently, without the client noticing:
◆The Composite pattern adds a container organization hierarchy for other objects, and the tree as a leaf of other trees Reuse;
◆ Decoration mode authorizes adding behaviors through interception methods to avoid introducing a large number of subclasses;
◆ Proxy mode authorizes operations for an object that does not yet exist or is difficult to access.
Finally, Flyweight is a standard implementation of ValueObjects without identity.