Object-oriented is a function added after PHP5 and a sign that PHP is moving towards a modern language.
In the era of procedural design, PHP has won the favor of many web developers for its low learning cost and quick entry , but it also limits the development of PHP.
After learning from the PHP language after Java and C++, while adding object-oriented features, it also maintains the characteristics of simplicity and understanding.
However, if you only use the inheritance features of PHP, it is not an object-oriented design , because this does not improve the reusability and flexibility of the code .
Whether it is PHP, Java or C++ programming language, most of the problems we encounter when programming have actually been dealt with repeatedly by other programmers .
Design patterns extract common problems, define tested solutions, and describe possible outcomes.
In other words, design patterns (Patterns) are solutions that can be reused in projects .
However, design patterns are not like components that can be combined to build a fixed solution to the system. They are a general method for solving general problems .
In layman's terms, design patterns are programming routines , not specific offensive and defensive actions, but solutions for designing better systems.
The object-oriented principle is " composition is better than inheritance ", because composition can dynamically handle tasks in a variety of ways .
Although the combination of objects will reduce the readability of the code, it will make the system more flexible and reusable .
The design pattern is the experience thatmany predecessors spent a lot of energy summarizing, and it is a series of tested and efficient methods of object combination.
Most of the design pattern introductions on the market are in the Java language. This article specially organizes a PHP version of the design pattern .
A total of 12 classic design patterns:
Reference materials: