PHP polymorphic code Example _php Tutorial

PHP Multi-State code example

This article mainly introduces the PHP polymorphic code example, this article uses 2 code examples to demonstrate the polymorphism in PHP, the needs of friends can refer to the following

Polymorphic definition: Only one interface or base class is concerned, not the specific class of an object. (same type, different result)

Here are two examples:

First, we find that the base class defines the standard, and the subclass implements the self-rule. This is a requirement for polymorphism. At the same time, this is a satisfying rewrite; in fact, it is different from the different classes, not strictly satisfies an interface, or the base class programming. Because you call not Stu->showgrade () but their own methods;

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Class stu{ Public Function Showgrade () { echo "base class"; } } Class Xiaomin extends stu{ Public Function Showgrade () { Echo "is son show"; } } Class Xiaoli extends stu{ Public Function Showgrade () { Echo ' is son s "How"; } } Function doit ($obj) { If (Get_class ($obj)! = "Stu") { $obj->showgrad E (); } } doit (new Xiaoli ()); Doit (new xiaomin ());

The second example: the Dovoice parameter specifies that $obj is a animal, and consciousness is to accept the implementation class object with the interface. The upward transformation. This conforms to the same type, with different results, which is polymorphic;

In fact, in Java it would be animal a = new dog (); Because PHP is a type language. There is no object transformation mechanism.

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Interface animal{ Public function voice (); } Class Cat Implements Animal{ Public Function voice () { echo "miao~~~ "; } } Class Dog Implements animal{ Public Function voice () { echo "Wang ~ ~ ~ "; } } function Dovoice (animal $obj) { $obj->voice (); } Dovoice (New Dog ()); Dovoice (New Cat ());

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