PHP study notes object-oriented construction and destruction methods_PHP tutorial

Copy code The code is as follows:

/*
* 1. Access to members in the object ( In the internal method of an object, access other methods and member properties in the object)
* 2. There is a $this keyword by default in the methods in the object, which represents the method that calls this method. Object
*
* Constructor method
*
* 1. It is the "first" "automatically called" method after the object is created
*
* 2. Constructor method Definition, the method name is fixed,
* In php4: The method that is the same as the class name is the constructor method
* In php5: The constructor method is selected to use the magic method __construct() to declare the constructor in all classes All methods use this name
* Advantages: When changing the class name, the constructor method does not need to be changed
* Magic method: If a magic method is written in the class, the function corresponding to this method will be added
* The method names are all fixed (all provided by the system), and there is no self-defined one
* Each magic method is a method that is automatically called at different times to complete a certain function
* Different Magic methods have different calling times
* All methods start with __
* __construct(); __destruct(); __set();...
*
* Function : Initialize member attributes;
*
*
* Destruction method
*
* 1. The last "automatically" called method before the object is released
* Use garbage Recycler (java php), and c++ manual release
*
* Function: close some resources and do some cleanup work
*
* __destruct();
*
*/
class Person{
var $name;
var $age;
var $sex;
//Construction method in php4
/*function Person()
{
//Every time an object is declared,
echo "1111111111111111";
}*/
//Constructor method in php5
function __construct($name,$age,$ sex){
$this->name=$name;
$this->age=$age;
$this->sex=$sex;
}
function say(){
//$this->name;//To access members in the object, use $this
echo "My name: {$this->name}, my age: {$ this->age}
"
}
function run(){
}
function eat(){
}
//Destruction method
function __destruct(){
}
}
$p1=new Person("zhangsan",25,"male");
$p2=new Person;
$p3=new Person ;

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