PHP Language-Object oriented

1. Defining classes

class ren{public$name// define member variable var$sex; function Say ()  // definition method {echo "This person is speaking";}}

2. Instantiation

$ren New Ren ();  // instantiation of $ren // Calling member variables $ren->sex= "female"; $ren->say (); // Calling Methods

3.this references

 class   ren{ public   $name   public   $sex   public  function   Say () { echo  ->name."  This man is talking "; // this represents object not class  }}   $ren  =   Ren ();   $ren ->name= "Zhang San" ;   $ren ->say (); 

4. Constructors

 class   ren{ public   $name   public   $sex     function  __construct (," Span style= "color: #800080;" > $sex ) //  constructor  {  $this ->name= $name  ;  $this ->sex =  $sex  ;}}  $ren  = new  Ren ("John Doe", "male"); 

5. Destructors

function __destruct ()  // Destroy object cast memory, close connection, etc.  Auto execute {echo ' The object is about to be destroyed. ";}

6. Encapsulation

classren{Private $name;//to private a member variablePrivate $sex;Private $age;//Encapsulation: Methods for accessing member variables     Public functionSetage ($age)    {        if($age> &&$age<80)        {        $this->age =$age; }    } //Encapsulation: Simple method assignment, automatic invocation    Public function__set ($name,$value)    {    if($name= = "Age")    {        if($value>18 &&$value<80)        {        $this-$name=$value; }    }    Else    {    $this-$name=$value; }    }  //encapsulation: A simple way to get a value     Public function__get ($name)    {    return $this-name; }     }$ren=NewRen ("John Doe", "male")$ren->name = "What"; Echo $ren->sex;

7. Inheritance

class extends ren{// Parent class method overrides function  Say () {parent:: Say ();  //  Echo "This is the method of the subclass";}}

8. Keywords

Final is used to modify the class, and if a class is defined as a final class, the class cannot be inherited.

Final class ren{}

Static statically.

classstudent{Static  Public $class;//Defining static VariablesStatic functionSay ()//Defining static Methods{Echo"AAAA";}} Student::$class= "Hello";//calling static variablesEchoStudent::$classStudent::$class;//calling a static method

Const defines constants in a class

Const // Defining constants

Echo Studen::ss

PHP Language-Object oriented