OOP PHP 在一个函数中设置变量值并从另一个函数中获取 [英] OOP PHP set variable value in one function and get from another function

问题描述

在我的课堂上，我试图在 __construct()

In my class, I am trying to set the value of a variable in a function other than __construct()

但我需要在另一个函数中使用该变量值.

But I need that variable value in another function.

这是我尝试过的.但不能正常工作.

Here is what I have tried. But not works Properly.

我希望打印 getty images 但我什么也没得到 :(

I expect to print getty images but I get nothing :(

<?php

class MyClass{
    public $var;

    public function __construct(){
        $this->var;
    }

    public function setval(){
        $this->var = 'getty Images';
    }

    public function printval(){
        echo $this->var;
    }
}

$test = new MyClass();
$test->printval();

推荐答案

你的构造函数什么都不做，你需要调用方法让它做一些事情.

Your constructor does nothing, you need to invoke the method for it to do something.

class MyClass{
    private $var;

    public function __construct() {
        // When the class is called, run the setVal() method
        $this->setval('getty Images');
    }

    public function setval($val) {
        $this->var = $val;
    }

    public function printval() {
        echo $this->var;
    }
}

$test = new MyClass();
$test->printval(); // Prints getty Images

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