How to traverse objects in php

* Traversing objects

* 1. Only properties can be traversed, methods cannot be traversed

* 2. External traversal can only view public visible properties

* 3. If To view all properties, you need to create an external interface method in the class to implement

* 4. The final result is presented in associative array format and uses the foreach() statement to traverse

class Lecture 
{
    public $name = 'Peter Zhu';
    public $gender = '男';
    public $age = 30;
    public $course = 'php,java,python,c';
    
    protected $email = 'peter@php.cn';
    private $salary = 18000;
    private $phone = 15905519988;
    
    public function listPro()
    {
        foreach ($this as $key=>$value){
            echo &#39;[&#39;.$key.&#39;] => &#39;.$value.&#39;<br>&#39;;
        }
    }
}
//类外只能访问到公共可见属性,不能查看受保护与私有属性
foreach((new Lecture) as $key=>$value){
    echo &#39;[&#39;.$key.&#39;] => &#39;.$value.&#39;<br>&#39;;
}
echo &#39;<hr>&#39;;
echo &#39;<h3>全部属性</h3>&#39;;
(new Lecture)->listPro();

//More For the method of traversing objects, you can check the official manual: SPL function library in php.net

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