PHP Magic Methods Usage summary

PHP (foreign name: HypertextPreprocessor, Chinese name: "Hypertext Preprocessor") is a common open source scripting language. The syntax absorbs the features of C language, Java, and Perl. it has a low entry threshold, is easy to learn, and is widely used. it is mainly applicable to the Web development field. PHP file suffix: php.

PHP (foreign name: Hypertext Preprocessor, Chinese name: "Hypertext Preprocessor") is a common open source scripting language. The syntax absorbs the features of C language, Java, and Perl. it has a low entry threshold, is easy to learn, and is widely used. it is mainly applicable to the Web development field. PHP file suffix: php.

This article mainly introduces how to use PHP magic methods and summarizes PHP magic methods. if you are interested, please refer to them.

The magic method is a special feature of PHP object-oriented. They are triggered under specific circumstances. they all start with Double underscores. you can think of them as hooks, using the pattern method, you can easily overload PHP object-oriented objects (Overloading is the dynamic creation of class attributes and methods ). There are many magic methods in pairs. The following lists all the current PHP mode methods.

1. _ construct ,__ destruct
_ Constuct is called when constructing an object;
_ Destruct is called to explicitly destroy an object or end the script;

2. _ get ,__ set
_ Set is called when an inaccessible or non-existent attribute is assigned a value.
_ Get is called when reading an inaccessible or non-existent attribute

3. _ isset ,__ unset
_ Isset is called when isset () or empty () is called for inaccessible or non-existent attributes
_ Unset is called when an unset operation is performed on an inaccessible or non-existent attribute.

4. _ call ,__ callStatic
_ Call is called when a method that is inaccessible or does not exist
_ CallStatic is called when a static method that is inaccessible or does not exist

5. _ sleep ,__ wakeup
_ Sleep is called when serialize is used. it is useful when you do not need to save all data of large objects.
_ Wakeup is called when unserialize is used. it can be used to initialize objects.

6. _ clone
Called to adjust the cloning behavior of an object.

7. _ toString
Called when a class is converted to a string

8. _ invoke
Called when an object is called in function mode

9. _ set_state
This static method is called when var_export () is called to export the class. Use the return value of _ set_state as the return value of var_export.

10. _ debuginfo
It is called when var_dump () is called to print an object (when you do not want to print all attributes) for PHP5.6

Source: Network