In this example we will see PHP access modifiers example. In PHP default access modifier is public. PHP provide different types of modifiers like  private, public or protected. Properties and methods can have access modifiers which control where they can be accessed.

    There are three access modifiers:

• public - the property or method can be accessed from everywhere. This is default
• protected - the property or method can be accessed within the class and by classes derived from that class
• private - the property or method can ONLY be accessed within the class

<?php  
class parent  
{  
    public $name="websolutionstuff";  
    function_display()  
    {  
        echo $this->name."<br/>";  
    }  
}  

class child extends parent
{  
    function show()  
    {  
        echo $this->name;  
    }  
}     

$obj= new child;  
echo $obj->name."<br/>";
$obj->function_display();
$obj->show();
?>

    Output :

websolutionstuff
websolutionstuff
websolutionstuff

<?php  
class Websolutionstuff
{  
    private $name="websolutionstuff";  
    private function show()  
    {  
        echo "This is private method of parent class";  
    }  
}

class child extends Websolutionstuff  
{  
    function show1()  
    {  
    echo $this->name;  
    }  
}     
$obj= new child;  
$obj->show();  
$obj->show1();  
?>

    Output : 

Fatal error:  Call to private method Websolutionstuff::show()....

<?php  
class Websolutionstuff
{  
    protected $a=200;  
    protected $b=100;  
    function add()  
    {  
        echo $sum=$this->a+$this->b."<br/>";  
    }  
}     
class child extends Websolutionstuff  
{  
    function sub()  
    {  
        echo $sub=$this->a-$this->b."<br/>";  
    }  
}     
$obj= new child;  
$obj->add();
$obj->sub();
?>

    Output : 

300
100

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