PHP 5 self and parent keyword
self and parent keyword
PHP provides two keywords that work with the scope resolution operator are following below.
Self keyword: This refers to the current class and it is usually used to access static methods, property and constant.
Parent keyword: This refers to the parent class. It is used often to when we want to call the parent constructor or method.
Example
<?php
Class Car
{
Const NAME = " Audi";
}
class Model extends Car
{
Const MOD = " R 8 ";
Const COLOR= " Black ";
public static function get()
{
echo "
Name of Brand:".parent::NAME;
echo "
Model of Car:".self::MOD;
echo "
Color of Car:".self::COLOR;
}
}
echo "Name of Brand:";
echo Car::NAME;
Model::get();
?>
Output
Name of Brand: Audi
Name of Brand: Audi
Model of Car: R 8
Color of Car: Black
In the above example, there are two classes Car and Model and Model is the child of Car class. Both have some property and behavior. If you want to access the static property or behavior of the parent class, then use parent keyword and if you want to access the static property or behavior of the child class then use self keyword, as shown above
Static property with object
<?php
Class Car
{
Const NAME = " Audi";
}
class model extends Car
{
Const MOD = " R 8 ";
Const COLOR= " Black ";
public function get()
{
echo "
Name of Brand:".parent::NAME;
echo "
Model of Car:".self::MOD;
echo "
Color of Car:".self::COLOR;
}
}
$uk=new model();
$uk->get();
?>
Output
Name of Brand: Audi
Model of Car: R 8
Color of Car: Black
