PHP Magic Method __set __get method

Look first. Official DocumentsThe explanation
__set () is the run when writing data to inaccessible properties.
__get () is utilized for reading data from inaccessible properties.
How do you translate it in Chinese? Inaccessible:n. Hard to reach, difficult to access, incomprehensible.
There is the truth in code:

error_reporting(E_ALL); class stu{ private $a; private $b = 0; public $c; public $d = 0; //这里的 private 可以用 protected public 替代 private function __get($name) { return 123; } //这里的 private 也可以用 protected public 替代 private function __set($name,$value) { echo "This is set function"; } } $s =new stu(); var_dump($s->a); //output: 123 var_dump($s->b); //output: 123 var_dump($s->c); //output: null var_dump($s->d); //output: 0 var_dump($s->e); //output: 123 $s->a = 3; //output: This is set function $s->c = 3; //no output $s->f = 3; //output: This is set function ?>

Results:
If there is no __get method, execution of Var_dump ($s->a) var_dump ($s->b) can have fatal errors
If there is no __get method, the execution of Var_dump ($s->e) has a notice, prompting that no attribute is defined $e
Summarize:
1. When reading data from an inaccessible property, the __get () method is called
2. When assigning values to an inaccessible property, the __set () method is called
3. Difficult to access includes: (1) Private attributes, (2) Properties without initialization
4. __isset () __unset () is similar

The above describes the PHP magic method __set __get method, including the aspects of the content, I hope that the PHP tutorial interested in a friend helpful.

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