How to use php __set magic method

In PHP, the "__set()" method is automatically called when assigning values to undefined or invisible class attributes in the current environment; the syntax format is "public function __set($key, $value){ ...;}", which receives two parameters, one representing the attribute name and one representing the attribute value.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

In object-oriented programming, PHP provides an A series of magic methods, these magic methods provide a lot of convenience for programming, and their role in PHP is very important. Magic methods in PHP usually start with __ (two underscores) and do not need to be explicitly called but are automatically called under certain conditions.

__set() method

The __set() method is automatically called when assigning a value to a class attribute that is undefined or invisible in the current environment. The syntax format for defining this method is as follows:

public function __set($key, $value){ ... ... ; }

Among them, the parameter $key is the name of the variable to be operated, and $value is the value of the variable $key.

[Example] The following uses a simple example to demonstrate the use of the __set() method.

'; } } $object = new Website(); $object -> name = 'php中文网'; $object -> url = '//m.sbmmt.com/'; $object -> title = 'PHP教程'; ?>

The running results are as follows:

为“url”赋值“//m.sbmmt.com/”失败！ 为“title”赋值“PHP教程”失败！

Using the characteristics of the __set() method, we can use the __set() method to assign or modify the attributes modified with the private keyword in the class. . As shown below:

$key)){ $this -> $key = $value; }else{ echo '为“'.$key.'”赋值“'.$value.'”失败！
'; } } public function getUrl(){ echo $this -> url; } } $object = new Website(); $object -> name = 'php中文网'; $object -> url = '//m.sbmmt.com/'; $object -> title = 'PHP教程'; $object -> getUrl(); ?>

The running results are as follows:

为“title”赋值“PHP教程”失败！ //m.sbmmt.com/

Recommended learning: "PHP Video Tutorial"

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