How to implement inheritance in PHP
This article is about how to implement inheritance in PHP. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.
The details are as follows:
Inherit
Let's look at two categories first.
Output:
Cd1 (bobbleson, bob): playing time-50
Book1 (harrelson, harry): page count-30
Comments: these two classes, the code repeatability is too high, there are similarities and differences. It is better to use inheritance to simplify processing.
Using inheritance to deal with
Output:
Cd1 (bobbleson, bob): playing time-50
Book1 (harrelson, harry): page count-30
Comments: inheritance is a good way to solve the problems of differences and similarities.
Further optimize the processing
Output:
Cd1 (bobbleson, bob): playing time-50
Book1 (harrelson, harry): page count-30
Comments: here we put the common attributes in the parent class and other personality attributes in our own class. And set your own constructor to inherit the constructor of the parent class.
Methods that further inherit the parent class
Output:
Cd1 (bobbleson, bob): playing time-50
Book1 (harrelson, harry): page count-30
Comments: the same results can be optimized and then optimized. Here inherits the methods of the parent class. Parent::getSummaryLine (). But this one is used less.
Continue to add some interesting content
Output:
Cd1 (bobbleson, bob): playing time-50
Price: 1
Book1 (harrelson, harry): page count-30
Price: 4
Comments: discounts are added to the parent class, and the getPrice method is modified after book inheritance, so the discount is not valid for book.
Privatization property, which is set and obtained by method
Output:
Cd1 (bobbleson, bob): playing time-50
Book1 (harrelson, harry): page count-30
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