First understanding of PHP (3) object-oriented features-how to code singularity

PHP (3) object-oriented features-how to encode the singularity PHP5 began to support object-oriented programming. PHP's object-oriented programming method is not much different from other languages. next we will make a simple record of PHP's basic programming-oriented syntax.

I. object declaration

Declaration method:

Class Say {

Public function SayHello (){

Echo 'Hello World! ';

}

}

This completes the simplest object declaration.

Constructor:

Class Say {

Private $ _ lang;

Public function _ construct ($ lang ){

$ This-> _ lang = $ lang;

Echo 'the language is $ this-> _ lang ';

}

Public function SayHello (){

Echo 'Hello World! ';

}

}

This is how the constructor works.

II. objects used

Call other PHP file methods:

Require 'sayphp ';

However, when this method is called repeatedly, an error of repeated definitions is reported. Therefore, another method is generally used:

Require_once 'sayphp ';

In this way, no error will be reported for repeated calls.

Then a new object is created:

$ A = new Say ('China ');

Use member functions:

$ A-> SayHello ();