PHP class declaration and instantiation and construction methods and methods of analysis, PHP detailed _php tutorial

PHP class declaration and instantiation and construction methods and methods of analysis, PHP detailed

In this paper, we describe the declaration and instantiation of PHP class, the method of construction and the method of destructor. Share to everyone for your reference, as follows:

<?phpclass human{public  static $leg =2;  Public $name = ' Leo ';  Public $age = ' + ';  Public Function Cry () {  }} $leo = new Human ();p Rint_r ($leo);/* Returns human Object ([name] = Leo [age] + 25) *///why not What about leg? Because of the addition of static, it becomes the property of the class, is all///Through this class instance instance of the object after the//public is the permission modifier, the permission modifier has public,protected,private//in PHP4 often used to Var, This is not how to recommend now, the equivalent of public//in the PHP5 will be the Var analysis into public?>

Is there any way to change the properties of an object by passing parameters at the time of the new object? Rather than the same.

A: You can define a construction method in a class that executes when the object is initialized, and can receive parameters

As shown below:

<?php class human{public  static $leg =2;  Public $name = ' Leo ';  Public $age = ' + ';  Public function __construct ($name, $age) {    $this->name= $name;    $this->age= $age;  }} $leo = new Human (' macro ', ' all ');p Rint_r ($leo);/* Returns human Object ([name] = macro [age] + 23) You can see that the parameters are working. __construct is Constructor */?>

Corresponding to the constructor is the destructor, which is executed when the object is destroyed.

As shown below:

<?php class human{public  static $leg =2;  Public $name = ' Leo ';  Public $age = ' + ';  Public function __construct ($name, $age) {    $this->name= $name;    $this->age= $age;    echo $this->name. " Object generation.
";  }  Public Function __destruct () {    echo $this->name. Object destroyed.
";  }} $leo = new Human (' macro ', ' all '), $tim = new Human (' Tim ', ' + '); unset ($leo); Echo ' ~~~~~~~~~~~~~~~~~~~~
*/* Return: Macro object generated Tim object generated macro object destroyed ~~~~~~~~~~~~~~~~~~~~tim object destroyed *///__destruct is a destructor, that is, when the object is destroyed call//why $tim not unset Destructors are also executed//This is an implicit destruction, unset is explicitly destroyed//when a page execution finishes automatically destroyed?>

More readers interested in object-oriented content in PHP can view the topic: "PHP Object-oriented Programming primer tutorial"

I hope this article is helpful to you in PHP programming.

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