Understanding and using the _ set () and _ get () interceptors in PHP, __set _ get

Understanding and using the _ set () and _ get () interceptors in PHP, __set _ get

"In general, class attributes are always defined as private, which is more in line with the actual logic.

However, attributes are read and assigned frequently. Therefore, in PHP5, we predefine the two functions "_ get ()" and "_ set () to obtain and assign values to the attributes, and check the "_ isset ()" and the method "_ unset ()" for deleting the attributes ()".

We set and obtain each attribute. In PHP5, we provide a method specifically for setting and obtaining values for the attribute, "_ set () "and" _ get () "methods. These two methods do not exist by default, but are manually added to the class, like the constructor (_ construct (), the class will only exist after it is added. You can add these two methods in the following way. Of course, you can also add them in your own style:"

<? Php // use the class Computer {private $ name; private $ price; private $ cpu; private $ clocked; // assign the value of public function _ set ($ key, $ value) {// then: $ key = name $ value = "Lenovo" has: $ this-> name = "Lenovo" return $ this-> $ key = $ value;} // value of the interceptor public function _ get ($ key) {if (isset ($ key) {// then: $ key = name is $ this-> name, so it is natural to return "Lenovo" return $ this-> $ key;} else {return NULL ;}}} // because the interceptor exists, $ computer = new Computer (); $ computer-> name = "Lenovo"; $ computer-> price = 5600 can be used in this way; $ computer-> cpu = "Eight cores"; $ computer-> clocked = "1600 hz"; echo $ computer-> name; echo $ computer-> price; echo $ computer-> cpu; echo $ computer-> clocked;

The above is a brief introduction to the understanding and usage of the PHP interceptor _ set () and _ get (). I hope you can provide more support ~