Summarize and organize magic methods in php

This article brings you relevant knowledge about PHP, which mainly introduces related issues about magic methods, and summarizes the __construct construction method, __destruct destructor method, and __clone cloning method. Wait, I hope it helps everyone.

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Detailed explanation of magic methods in php, in php There is a type of method that is very strange, that is, as long as certain conditions are met, it will be executed by itself, that is the magic method in php,

1. __construct construction method

• It will be called when the class is instantiated
• Simply put, when a new class is created, this method will be automatically executed

<?php
class autofelix 
{
    public function __construct()
    {
        echo &#39;我是类autofelix&#39;;
    }
}

new autofelix();

//即可输出:我是类autofelix

2. __destruct destructor method

• Automatically triggered when the class is destroyed
• You can use the unset method to trigger this method

<?php
class autofelix 
{
    public function __destruct()
    {
        echo &#39;我准备销毁你了&#39;;
    }
}

$a = new autofelix();
unset($a);

//即可输出:我准备销毁你了

3. __clone cloning method

• Will be automatically called when the class is cloned

<?php
class autofelix 
{
    public function __clone()
    {
        echo &#39;我克隆了你&#39;;
    }
}

$a = new autofelix();
clone $a;

//即可输出:我克隆了你

4. __call non-static calling method

• It will be automatically called when the method to be called does not exist or has insufficient permissions
• For example, if I call a private modified method inside the class from outside the class

<?php
class autofelix 
{
    private function say() 
    {
        echo &#39;hello, 我是autofelix&#39;;
    }

    public function __call($name, $arguments)
    {
        echo &#39;你无权调用&#39; . $name . &#39;方法&#39;;
        die;
    }
}

$a = new autofelix();
$a->say(); //按理说应该报错

//即可输出:你无权调用say方法

5. __callStatic static calling method

• When the static method to be called does not exist or the permissions are insufficient, it will be called automatically.
• For example, when I am in the class Externally call the private modified static method inside the class

<?php
class autofelix 
{
    private static function say() 
    {
        echo &#39;hello, 我是autofelix&#39;;
    }

    public function __callStatic($name, $arguments)
    {
        echo &#39;你无权调用&#39; . $name . &#39;方法&#39;;
        die;
    }
}

$a = new autofelix();
$a::say(); //按理说应该报错

//即可输出:你无权调用say方法

6. __debugInfo printing method

• This method will be used when var_dump() class object Called
• If this method is not defined, var_dump() will print out all class attributes

<?php
class autofelix 
{
    public function __debugInfo()
    {
        echo &#39;你看不到我任何信息的~&#39;;
    }
}

var_dump(new autofelix());

//即可输出:你看不到我任何信息的~

7. __get method to obtain member attributes

• Through it, private member properties can be obtained outside the object

<?php
class autofelix 
{
    private $name = &#39;autofelix&#39;;

    public function __get($name)
    {
        if(in_array($name, [&#39;name&#39;, &#39;age&#39;])) {
           echo $this->name;
        } else {
            echo '不是什么东西都能访问的~';
        }
    }
}

$a = new autofelix();
$a->name;

//即可输出:autofelix

8. __isset method

• When the pair is inaccessible The attribute will be automatically called when calling isset() or empty()

<?php
class autofelix 
{
    private $name = &#39;autofelix&#39;;

    public function __isset($name)
    {
        if(in_array($name, [&#39;name&#39;, &#39;age&#39;])) {
           echo $this->name;
        } else {
            echo '不是什么东西都能访问的~';
        }
    }
}

$a = new autofelix();
isset($a->name);

//结果: autofelix

9. __set method

• gives an undefined will be triggered when the attribute is assigned

<?php
class autofelix 
{
    public function __set($name, $value)
    {
        echo &#39;你想给&#39; . $name . &#39;赋值&#39; . $value;
    }
}

$a = new autofelix();
$a->name = 'autofelix';

//结果: 你想给name赋值autofelix;

10. __invoke method

• The object itself cannot be used directly as a function
• If This method will be triggered when the object is called as a function

<?php
class autofelix 
{
    public function __invoke()
    {
        echo &#39;你还想调用我?&#39;;
    }
}

$a = new autofelix();

//对象直接当函数调用
$a();

//结果: 你还想调用我?

11. __sleep method

• When serialize() is called outside the class It will be called automatically

<?php
class autofelix 
{
    public function __sleep()
    {
        echo &#39;弄啥嘞~&#39;;
    }
}

$a = new autofelix();

serialize($a);

//结果: 弄啥嘞~

12. __toString method

• What should be returned when a class is treated as a string
• A string type must be returned here, otherwise a fatal error will be reported

<?php
class autofelix 
{
    public function __toString()
    {
        return &#39;我是你得不到的对象...&#39;;
    }
}

$a = new autofelix();
echo $a;

//结果: 我是你得不到的对象...

13. __unset method

• When inaccessible The attribute will be automatically called when unset() is called

<?php
class autofelix 
{
    private $name = &#39;autofelix&#39;;

    public function __unset($name)
    {
        echo &#39;想删我? 你也配?&#39;;
    }
}

$a = new autofelix();
unset($a->name);

//结果: 想删我? 你也配?

14. __wakeup method

• will be automatically called when the unserialize() method is executed Call

<?php
class autofelix 
{
    public function __wakeup()
    {
        echo '又想弄啥嘞~';
    }
}

$a = new autofelix();

unserialize($a);

//结果: 又想弄啥嘞~

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