A complete PHP class contains seven syntax descriptions, seven syntaxes for the PHP class_PHP tutorial

A complete PHP class contains seven syntax descriptions, seven syntax descriptions in the PHP class

Seven syntax descriptions in the class

-Properties
-static properties
-Method
-Static method
-Class constant
-Constructor
-Destructor

<&#63;php
  class Student {
    // 类里的属性、方法和函数的访问权限有 （函数和方法是同一个概念）
    // private 私有的 protected 受保护的 public 公有的
    // 类常量 没有访问权限修饰符
    const STUDENT = 'Tom';
    // 属性
    public $stu_name;
    // 静态属性
    public static $stu_num = 1;
    // 方法
    public function stuFunction() {
      echo 'non_static_function','<br />';
    }
    // 静态方法
    public static function static_stuFunction() {
      echo 'static_function','<br />';
    }
    // 构造函数 创建对象时自动调用
    public function __construct($stu_name) {
      $this->stu_name = $stu_name;
      echo '__construct','<br />';

    }
    // 析构函数 销毁对象时自动调用
    public function __destruct() {
      echo '__destruct','<br />';
    }
  }

  // 实例化类对象
  $object = new Student('Tom');
  // 对象调用属性
  echo $object->stu_name,'<br />';
  // 对象调用静态属性
  echo $object::$stu_num,'<br />';
  // 类调用静态属性
  echo Student::$stu_num,'<br />';
  // 使用对象分别调用方法和静态方法
  $object->stuFunction();
  $object->static_stuFunction();
  $object::stuFunction();
  $object::static_stuFunction();
  // 使用类分别调用方法和静态方法
  Student::stuFunction();
  Student::static_stuFunction();
  // 类调用类常量
  echo Student::STUDENT,'<br />';

Summary:

Objects can call properties and static properties, and classes can only call static properties.

Objects can call methods and static methods, and classes can call methods and static methods.

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