Access Specifiers in PHP
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Access Specifiers in PHP
There are three types of Access Specifiers available in PHP, Private, Protected and Public.
Public: Class members declared public can be accessed everywhere.
Protected: Class members declared protected can be accessed only within the class itself and by inheriting classes.
Private: Class members declared as private may only be accessed by the class that defines the member.
Syntax
<?php
class MyClass
{
public $public = 'Public';
protected $protected = 'Protected';
private $private = 'Private';
function printHello()
{
echo $this->public;
echo $this->protected;
echo $this->private;
}
}
$obj = new MyClass();
echo $obj->public; // Works
echo $obj->protected; // Fatal Error
echo $obj->private; // Fatal Error
$obj->printHello(); // Shows Public, Protected and Private
/**
* Define MyClass2
*/
class MyClass2 extends MyClass
{
// We can redeclare the public and protected properties, but not private
public $public = 'Public2';
protected $protected = 'Protected2';
function printHello()
{
echo $this->public;
echo $this->protected;
echo $this->private;
}
}
$obj2 = new MyClass2();
echo $obj2->public; // Works
echo $obj2->protected; // Fatal Error
echo $obj2->private; // Undefined
$obj2->printHello(); // Shows Public2, Protected2, Undefined
?>
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