What is the difference between public, private, and protected?

When and why should I use public , private , and protected functions and variables inside a class? What is the difference between them?

Examples:

// Public
public $variable;
public function doSomething() {
  // ...
}

// Private
private $variable;
private function doSomething() {
  // ...
}

// Protected
protected $variable;
protected function doSomething() {
  // ...
}
1 Like

You use:

  • public scope to make that property/method available from anywhere, other classes and instances of the object.
  • private scope when you want your property/method to be visible in its own class only.
  • protected scope when you want to make your property/method visible in all classes that extend current class including the parent class.

More: (For comprehensive information)

Refer: stackoverflow.com