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一个完整的PHP类包含的七种语法说明_PHP

May 30, 2016 am 08:45 AM
php class grammar

类中的七种语法说明

-属性
-静态属性
-方法
-静态方法
-类常量
-构造函数
-析构函数

<&#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 />';
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总结:

对象可以调用属性和静态属性,类只能调用静态属性。

对象可以调用方法和静态方法,类可以调用方法和静态方法。

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