PHP - Access Modifiers
PHP - Access Modifiers
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
In the following example we have added three different access modifiers to the three properties. Here, if you try to set the name property it will work fine (because the name property is public). However, if you try to set the color or weight property it will result in a fatal error (because the color and weight property are protected and private):
Creating PHP Function
Its very easy to create your own PHP function. Suppose you want to create a PHP function which will simply write a simple message on your browser when you will call it. Following
Note that while creating a function its name should start with keyword function and all the PHP code should be put inside { and } braces as shown in the following example below:
`
<?php
class Fruit {
public $name;
protected $color;
private $weight;
}
$mango = new Fruit();
$mango->name = 'Mango'; // OK
$mango->color = 'Yellow'; // ERROR
$mango->weight = '300'; // ERROR
?<
In the next example we have added access modifiers to two methods. Here, if you try to call the set_color() or the set_weight() function it will result in a fatal error (because the two functions are considered protected and private), even if all the properties are public:
`
<?php
class Fruit {
public $name;
public $color;
public $weight;
function set_name($n) { // a public function (default)
$this->name = $n;
}
protected function set_color($n) { // a protected function
$this->color = $n;
}
private function set_weight($n) { // a private function
$this->weight = $n;
}
}
$mango = new Fruit();
$mango->set_name('Mango'); // OK
$mango->set_color('Yellow'); // ERROR
$mango->set_weight('300'); // ERROR
?>
