如何使用 php __toString [英] How to use php __toString

问题描述

__toString 在 PHP 中有什么用途?

What are the uses of __toString in PHP?

例如，我有一个函数，例如(在名为 person 的类中)

For example I have a function such as (inside a class called person)

public function __construct($id, $name) {

       $this->id = $id;
       $this->name= $name;
  }

和

$person= new person("12","James");

$person->setDescription("Test Description");

$person->setImage("Test Image");

如何使用 __toString 获取这些数据并将它们打印在一行上.

How can I use __toString to grab this data and print them on one line.

例如: 12 测试描述 James 测试图像

推荐答案

__toString() 方法用于如果您尝试回显对象实例而不是该对象的简单属性.通常会抛出异常，但是 to_string 方法定义了一个响应

The __toString() method is used if you try to echo an object instance rather than simply properties of that object. Normally that would throw an exception, but the to_string method defines a response

class person{
    public function __construct($id, $name) {
        $this->id = $id;
        $this->name= $name;
    }
    public function __toString() {
        return $this->id . ' ' . $this->name;
    }
}

$person= new person("12","James");
echo $person;

__toString() 返回将被回显的值

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