PHP Magic Methods Usage summary, php magic summary _ PHP Tutorial

PHP magic method usage summary, php magic summary. PHP magic methods use method summary, php magic summary magic method is a special feature of PHP object-oriented. They are triggered under specific circumstances. they all start with a double underline. you can summarize PHP magic methods and php magic methods.

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

Example of PHP magic method:

<? Php class Magic {public $ var = 'test'; // Constructor. call public function _ construct () {echo '_ construct called' when creating an object '. PHP_EOL;} // a reference to an object is deleted, the object is destroyed, exit () is called, and public function _ destruct () is called when the script is closed () {echo '_ destruct called '. PHP_EOL;} // public function _ set ($ name, $ value) {echo $ name. '-'. $ value; echo '_ set called '. PHP_EOL;} // public function _ get ($ name) {echo $ Name; echo '_ get called '. PHP_EOL;} // public function _ call ($ name, $ arguments) {echo $ name. '-'. implode (',', $ arguments); echo '_ call called '. PHP_EOL;} // public static function _ callStatic ($ name, $ arguments) {echo $ name. '-'. implode (',', $ arguments); echo '_ callStatic called '. PHP_EOL;} // public function _ isset is called when isset () or empty () is called for an inaccessible or non-existent attribute. ($ Name) {echo $ name; echo '_ isset called '. PHP_EOL; return true;} // public function _ unset ($ name) {echo $ name; echo '_ unset called '. PHP_EOL;} // serialize is called. public function _ sleep () {echo '_ sleep called' is useful when you do not need to save all data of a large object '. PHP_EOL; return array ('var11111111111111');} // unserialize is called and can be used to initialize some objects. public function _ wakeup () {echo '_ wakeup called '. PHP_EOL; $ this-> Var = 'Test after wakeup ';} // when a class is converted to a string, public function _ toString () {return' _ toString called 'is called '. PHP_EOL;} // called when cloning an object. it is used to adjust the object's clone behavior public function _ clone () {echo '_ clone called '. PHP_EOL;} // public function _ invoke () {echo '_ invoke called' is called when an object is called in function mode '. PHP_EOL;} // 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. Public static function _ set_state ($ arr) {return '_ set_state called '. PHP_EOL;} // This is called when var_dump () is called to print an object (when you do not want to print all attributes). This applies to public function _ debuginfo ($ arr) of PHP5.6) {echo '_ debuginfo called '. PHP_EOL; return array ('var' => 'test fro _ debuginfo '); }}$ m = new Magic (); // _ construct () called $ m-> not_exist_property = test; // _ set () echo $ m-> not_exist_property; // _ get () $ m-> abc (1, 2, 3); // _ call () is called echo isset ($ m-> not_exist_property); // _ isset () called, return bool value unset ($ m-> not_exist_property); // _ unset () is called echo $ tmp = serialize ($ m ); // _ sleep () is called unserialize ($ tmp); // _ wakeup () is called $ m1 = clone $ m; // _ clone () called. the object is passed by reference by default. you can use the clone keyword to copy $ m (); // _ invoke () eval ('$ m2 = '. var_export ($ m, true ). ';'); var_dump ($ m2); var_dump ($ m); // The Last _ destruct () is called/* result: _ construct callednot_exist_property-test _ set callednot_exist_property _ get calledabc-1, 2, 3 _ call callednot_exist_property _ isset called1not_exist_property _ unset called _ sleep calledO: 5: "Magic": 1: {s: 13: "var11111111"; N ;:__ wakeup called _ destruct called _ clone called _ invoke calledstring (20) "_ set_state called" class Magic #1 (1) {public $ var => string (4) "test" }__ destruct called _ destruct called */

The above is all about how to use PHP magic methods. I hope it will be helpful for your learning.

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