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Editor to share with you the high-level features of PHP example analysis, I believe that most people do not know much about it, so share this article for your reference, I hope you will learn a lot after reading this article, let's go to know it!

The details are as follows:

Static attribute

Output: 0 hello

Comments: static properties and methods can be called directly through the class.

SELF

Output:

Hello (1) hello (2) hello (3)

Comments: self points to the current class, and this points to the current object. Self can call the static properties and methods of the current class. This points to the current object. Self can call the static properties and methods of the current class. This can call the normal properties and methods of the current class.

Constant attribute

Output: 0

Comments: constants can only be used in uppercase letters and can be called directly through the class.

Interface

If the getPrice method is not implemented, an error will be reported.

Fatal error: Class ShopProduct contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (Chargeable::getPrice)

Inherit classes and interfaces

Abstract class

Let's take a look at a piece of code.

Output:

Document Object ()

Static method

Output:

User Object ([group:DomainObject:private] = > default) SpreadSheet Object ([group:DomainObject:private] = > document)

Final field

It doesn't use much to make a class impossible to inherit.

Output:

Fatal error: Class IllegalCheckout may not inherit from final class (Checkout)

The final method cannot be overridden

Output:

Fatal error: Cannot override final method Checkout::totalize ()

Destructor function

Output:

Do nothing

_ _ clone method

Execute when cloning

Output:

Person Object ([name:Person:private] = > bob [age:Person:private] = > 44 [id:Person:private] = > 343) Person Object ([name:Person:private] = > bob [age:Person:private] = > 44 [id:Person:private] = > 0)

Look at another example.

Comments: learning can still open up the brain, today finally understand why there are multiple arrows of the concept of $person- > account- > balance. The account property here is an object.

_ _ toString

The above is all the content of the article "sample Analysis of Advanced Features in PHP". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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