PHP Object-oriented

Process oriented
/* $r = 5;
$m = 3.14* $r * $R;

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

Info:code,name,sex,nation,birthday
Object: A specific information p001 Zhang San male han 1990-2-3

To define a class:
Class Ren
{
Public $Name; Member variables
protected $age;
Private $height;
var $sex; Generally do not assign a value to a member variable

function __construct ($s)//constructor
{
$this->sex = $s;
}

function Run ()//member functions (method)
{
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->name = ' Zhang San '; Assign a value to the name of the object
Echo $r->age;

Var_dump ($R);
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

$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

Class Ren
{
Private $name;
Private $sex;
Private $age;

function __construct ($s)
{
$this->sex = $s;
}
Public Function Say ()
{
echo "Hello";
}
function __destruct ()//destructor, object destruction before execution
{
echo "The object was destroyed!" ";
}

/*function setage ($a)//function assigned to age
{
if ($a >10 && $a <50)
{
$this->age = $a;
}
}
function getage ()//Take the value of age
{
return $this->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;
}
}

function __get ($name)//Magic method for taking a value on a private member inside a class
{
return $this $name;
}
}

$r = new Ren ("male");
$r->setage (40);
$r->say ();
Echo $r->sex;

$r->__set ("name", "Zhang San");
$r->name = "John Doe"; Executing this statement will automatically call the __set method
$r->sex = "female";
$r->age = 40;

echo $r->getage ();

Var_dump ($R);

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

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

Inherited
Polymorphic

PHP Object-oriented