Commonly used magic methods in PHP (summary sharing)-PHP Problem-php.cn

Commonly used magic methods in PHP (summary sharing)

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Release： 2023-03-16 19:32:02

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This article brings you relevant knowledge about PHP. PHP regards all methods starting with "__" as magic methods. The following mainly introduces several magic methods commonly used in PHP. , the sample code is explained in detail in the article, you can refer to it if needed.

Commonly used magic methods in PHP (summary sharing)

(Recommended tutorial: PHP video tutorial)

Constructor method/__construct

When the class is instantiated

Simply put, when a new class is created, this method will automatically execute

<?php
class autofelix 
{
    public function __construct()
    {
        echo &#39;我是飞兔小哥~&#39;;
    }
}

new autofelix();

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Destruction method/__destruct

When the class is destroyed Automatically triggered when

You can use the unset method to trigger this method

<?php
class autofelix 
{
    public function __destruct()
    {
        echo &#39;我是飞兔小哥，别销毁我~&#39;;
    }
}

unset(new autofelix());

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Clone method/__clone

It will be automatically called when the class is cloned

<?php
class autofelix 
{
    public function __clone()
    {
        echo &#39;我是飞兔小哥，我想克隆你~&#39;;
    }
}

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

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non Static calling method/__call

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;我是飞兔小哥~&#39;;
    }

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

(new autofelix())->say();

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Static calling method/__callStatic

It will be automatically called when the static method to be called does not exist or has insufficient permissions

For example, I call a private modified static method inside the class from outside the class

<?php
class autofelix 
{
    private static function say() 
    {
        echo &#39;我是飞兔小哥~&#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();

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Print method/__debugInfo

This method will be called when var_dump() class object

If this method is not defined, var_dump() will print out all classes Attribute

<?php
class autofelix 
{
    public function __debugInfo()
    {
        echo &#39;飞兔小哥给你温馨提示&#39;;
    }
}

var_dump(new autofelix());

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Get member attributes/__get

Through it, you can get private member attributes outside the object

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

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

(new autofelix())->name;

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Get inaccessible attributes/__isset

When pairing Inaccessible properties will be automatically called when calling isset() or empty()

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

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

isset(new autofelix()->name);

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Attribute assignment/__set

Will be triggered when assigning a value to an undefined property

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

(new autofelix())->name = &#39;飞兔小哥&#39;;

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Call the object itself/__invoke

The object itself cannot be used directly as a function

If the object is called as a function, this method will be triggered

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

(new autofelix())();

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Serialization call / __sleep

Will be automatically called when serialize() is called outside the class

<?php
class autofelix 
{
    public function __sleep()
    {
        echo &#39;我是飞兔小哥~&#39;;
    }
}

serialize(new autofelix());

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Deserialization call/__wakeup

Will be called when the unserialize() method is executed Automatic call

<?php
class autofelix 
{
    public function __wakeup()
    {
        echo &#39;我是飞兔小哥~&#39;;
    }
}

unserialize(new autofelix());

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Output character call/__toString

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;

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Delete call/__unset

When unset() is called on an inaccessible property, it will be automatically called

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

    public function __unset($name)
    {
        echo &#39;别删我，我是你兔哥&#39;;
    }
}

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

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(Recommended tutorial: PHP video tutorial)

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