PHP Object-oriented

Process oriented

Classes and objects
Object: Anything can be called an object, something instantiated by a class
Class: Something abstracted from all the same objects

To define a class:

classren{ Public$Name;//member Variables    protected$age; Private$height; var$sex;//generally do not assign a value to a member variablefunction Run ()//member functions (methods){echo"this man is running! "; } function Say () {echo $ This->name."I 'm talking! "; }}

Using classes

// 1. Instantiating an object $r New Ren ("male"); // 2. Assigning values to member variables (calling member variables) $r // assign a value to the name of the object $r->age;        // value//3. Calling member Methods $r->say ();    // Execute member Method

Access modifiers
1. If you want to add access modifiers, you need to remove Var
2. Three kinds: public protected protected private private
3. If you do not add an access modifier, the default is public

1  Public $Name //      public 2protected$age//   protected  3  Private$height//   proprietary 4var$sex  //

$this references
$this represents the object (which object is called) and does not represent the class

constructor function
1. Special wording: __construct ()
2. Special execution: The first thing to do when creating objects
Action: Initialize an Object

1 classRen2 {3      Public $Name;4     protected $age; 5     Private $height;6     var $sex; 7     8     function__construct ($s)//constructor Function9     {Ten         $this->sex =$s; One     } A } - $r=NewRen ("Male"); - Var_dump($r);

destructor, which executes before the object is destroyed

1 classRen2 {3     Private $name;4     Private $sex;5     Private $age;6      Public functionSay ()7     {8         Echo"Hello";9     }Ten     function__destruct ()//destructor, which executes before the object is destroyed One     { A         Echo"The object was destroyed!" "; -     } - } the  - $r=NewRen ("Male"); - $r->say ();

Object-oriented three major features
Packaging
Purpose: To make the class more secure and not allow the outside world to directly access the member variables inside the class
Practice:

1. Make the member variables private
2. Do a method to implement the value of the variable or assignment, in the method to add a restriction condition

Inherited

Polymorphic

Assignment value:

1. Common Methods

1 classRen2 {3     Private $name;4     Private $sex;5     Private $age;6     functionSetage ($a)//a function that assigns a value to age7     {8         if($a>10 &&$a<50)9         {Ten             $this->age =$a; One         } A     } - } -  the $r=NewRen (); - $r->setage (40);

2. Magic method

classren{Private $name; Private $sex; Private $age; function__set ($name,$value)//Magic method of assigning a value to a private member inside a class    {        if($name= = "Age")        {            if($value>20 &&$value<50)            {                $this-$name=$value; }        }        Else        {            $this-$name=$value;//Assign Value        }    }$r=NewRen ();$r->age = 40;

Value:

1. Common methods

classren{Private $name; Private $sex; Private $age; functionGetage ()//take the value of age    {        return $this->age;//returns the value of an age    }    $r=NewRen ();Echo $r->age;

2. Magic method

1 classRen2 {3     Private $name;4     Private $sex;5     Private $age;6     function__get ($name)//Magic method for taking a value on a private member inside a class7     {8         return $this-$name;9     }Ten } One $r=NewRen (); A Echo $r->sex;

Using the Magic method provided in the class can also implement the operation of the private member
__set () Feature: will automatically execute, the variable name in the assignment statement as the first parameter, the value of the variable as a second parameter call __set method
__get () Feature: will automatically execute, the variable name in the value statement as a parameter call __get method

PHP Object-oriented