Should PHP be object-oriented?

1. Introduction to object-oriented

Object-oriented is a programming idea. Programming ideas are process-oriented and object-oriented

Process-oriented: Programming ideas focus on the process

Object-oriented: Programming ideas focus on the participating objects

II , The benefits of object-oriented

1. Multi-person cooperation

2. Reduce code redundancy and high flexibility

3. Maximize the reusability of code To the extreme

4. Strong scalability

3. Classes and objects

1. Objects are concrete things that exist, and objects are composed of attributes. and methods

2. A class is a collection of objects with the same properties and behaviors

Note: A class can create multiple objects

Summary:

1. Objects are composed of properties and methods

2. Classes are a collection of the same properties and methods of all objects

3. When developing, first write classes, create objects through classes, and call methods and properties through objects

4. Implement classes and objects in PHP

4.1 Create classes

Syntax:

class 类名{
    //属性
    //方法
    //常量
}

A class is composed of attributes, methods, and constants. It can also be said that class members include: attributes, methods, and constants.

Naming rules for class names:

1. Start with letters and underscores, followed by letters, numbers, and underscores

2. Cannot Use PHP keywords to make class names

3. Class names are not case-sensitive (variable names are case-sensitive, keywords and class names are not case-sensitive)

4. Class names use Pascal nomenclature (Big camel case capitalizes the first letter of the word)

4.2 Object instantiation

instantiate the object through the new keyword

<?php
//定义类
class Student {
}
//实例化对象
$stu1=new Student();

4.3 Comparison of objects

Note: The transfer of objects is address transfer

Equal: The structure and the saved value are equal if they are the same

Congruent: Only when they point to the same object Are congruent

5. Attributes

The essence of attributes is variables. Call the members of the object through ->object name->property name, object name->method name ().

6. Method

The essence of the method is the function

Summary:

1. Before the method public can be omitted, if omitted, the default is public.

2. Public in front of the attribute cannot be omitted

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