What are php member methods

php member method is also called member function, which is defined inside the class and can be used to access the data of the object; the syntax format of php member method is [[modifier] function method name (parameter..){[ Method body][return return value]}].

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Member properties and member methods in PHP classes

类的声明
成员属性
成员方法（成员函数 − 定义在类的内部，可用于访问对象的数据）

Class declaration

Simple format:

[修饰符] class 类名{ //使用class关键字加空格后加上类名
[成员属性] //也叫成员变量
[成员方法] //也叫成员函数
}

Full format:

[修饰符] class 类名 [extends 父类] [implements 接口1[,接口2...]]{
[成员属性] //也叫成员变量
[成员方法] //也叫成员函数
}

Member attributes

Format:

Modifier $variable name[=default value]; //For example: public $name="zhangsan";

Note: Member attributes cannot be expressions, variables, or methods with operators or function call.

    public $var3 = 1+2;          //错误格式
    public $var4 = self::myStaticMethod();   //错误格式
    public $var5 = $myVar;           //错误格式

Correct definition:

    public $var6 = 100; //普通数值（4个标量：整数、浮点数、布尔、字串）
    public $var6 = myConstant;       //常量
    public $var7 = self::classConstant;     //静态属性
    public $var8 = array(true, false);      //数组

Common attribute modifiers: public, protected, private, static, var (obsolete)

Member method

Member Method format:

[修饰符] function 方法名(参数..){
[方法体]
[return 返回值]
}

Modifiers: public, protected, private, static, abstract, final

The declared member method must be related to the object and cannot be some meaningless operation

      //下面声明了几个人的成员方法,通常将成员方法声明在成员属性的下面
       public function say(){    //人可以说话的方法
            echo "人在说话";        //方法体
        }       
       public function run(){     //人可以走路的方法
            echo "人在走路";        //方法体
        }
<?php   //声明一个电话类,类名为Phone
    class Phone {                   
        //声明4个与电话有关的成员属性
        public $Manufacturers;        //第一个成员属性，用于存储电话的外观
        public $color;                       //第二个成员属性，用来设置电话的外观颜色
        public $Battery_capacity;    //第三个成员属性，用来定义电话的电池容量
        public $screen_size;           //第四个成员属性，用来定义电话的屏幕尺寸
        //第一个成员方法用来声明电话具有接打电话的功能
        public function call(){                
            echo "正在打电话";         //方法体，可以是打电话的具体内容
        }
        //第二个成员方法用来声明电话具有发信息的功能
        public function message(){             
            echo "正在发信息";         //方法体，可以是发送的具体信息
        }
        //第三个成员方法用来声明电话具有拍照的功能
        public function photo() {               
             echo "正在拍照";           //方法体，可以是拍照的整个过程
        }
    }

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