Visibility Scope Of Variable And Functions -FindNerd

There are three type of visibility scope:

• Public
• Private
• Protected

PUBLIC: Variable or function of public scope can be accessed throughout the program.  

PRIVATE : Variable or function of private scope can be accessed only with in the class they are declared.  

PROTECTED:

Variable or function of protected scope can be accessed only by its subclass and derived class.

<?php
/**
* Define ClassA
*/
class ClassA
{
public $a = 1;
protected $b = 2;
private $c = 3;
function detail()
{
echo $this->a;
echo $this->b;
echo $this->c;
}
}
$obj = new ClassA();
echo $obj->a; // Works
echo $obj->b; // Fatal Error
echo $obj->c; // Fatal Error
$obj->detail(); // Shows Public, Protected and Private

Variable or function of protected scope can be accessed only by its subclass and derived class.

 - See more at: http://findnerd.com/list/view/Visibility-Scope-Of-Variable-And-Functions/3556/

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