PHP Basics - PHP magic method

PHP 13 There are three common magic methods :

__construct、__destruct、__call or __callStatic、__get、__set、__isset、__unset、__toString、__clone、__autoload、__invoke、__sleep、__wakeup

1. __construct Construction method

__construct Construction method , When a class is instantiated to create an object , Will call the constructor .

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2. __destruct destructor

__destruct destructor , When an object is destroyed or loses a reference to the object , Would call destructor .

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3. __call or __callStatic

When calling an undefined or unauthorized member method , Would call __call Method .（ When calling an undefined or unauthorized member method in a static method , It will call __callStatic Method .）

If this class cannot find the called member method , Will find it in the parent class .

If this class cannot be found __call Method , Will find it in the parent class .

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4. __get

When calling an undefined or non-public member property , Would call __get Method .

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5. __set

When assigning a value to an undefined or non-public member attribute , Would call __set Method .

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6. __isset

When called on an undefined or non-public member attribute isset Function time , Would call __isset Method .

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7. __unset

When called on an undefined or non-public member attribute unset Function time , Would call __unset Method .

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8. __toString

When printing out an object , Automatically called __toString Method . example : echo Object name .

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9. __clone

When cloning an object , Automatically called __clone Method . example : $clone_obj = clone Object name ;

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10. __autoload

When instantiating an undefined class, it will automatically call __autoload To load class files .

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11. __invoke

When trying to call an object as a function , Automatically called __invoke Method .

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12. __sleep

serialize() Function will check whether there is __sleep Method , If there is , Execute first __sleep Method , Re execution Serialization operation .

<?php
    class User
	{
     
    	public function __sleep(){
     
            // 
        }
	}
    $obj = new User();
	serialize($obj);

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13. __wakeup

unserialize() Function will check whether there is __wakeup Method , If there is , Execute first __wakeup Method , Re execution Deserialization operation .

<?php
    class User
	{
     
    	public function __wakeup(){
     
            // 
        }
	}
    $obj = new User();
	unserialize($obj);