Seven syntax descriptions in PHP classes_PHP tutorial

Seven syntax descriptions in PHP classes

Seven syntax descriptions in classes

-Attributes
-Static properties
-Method
-Static method
-Class constants
-Constructor
-Destructor

<code class="language-php hljs "><!--?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 $stu_num = 1;
        // 方法
        public function stuFunction() {
            echo 'non_static_function','<br /-->&#39;;
        }
        // 静态方法
        public static function static_stuFunction() {
            echo &#39;static_function&#39;,&#39;
&#39;;
        }
        // 构造函数 创建对象时自动调用
        public function __construct($stu_name) {
            $this->stu_name = $stu_name;
            echo &#39;__construct&#39;,&#39;
&#39;;

        }
        // 析构函数 销毁对象时自动调用
        public function __destruct() {
            echo &#39;__destruct&#39;,&#39;
&#39;;
        }
    }

    // 实例化类对象
    $object = new Student(&#39;Tom&#39;);
    // 对象调用属性
    echo $object->stu_name,&#39;
&#39;;
    // 对象调用静态属性
    echo $object::$stu_num,&#39;
&#39;;
    // 类调用静态属性
    echo Student::$stu_num,&#39;
&#39;;
    // 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,&#39;
&#39;;</code>

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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