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

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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() {
 //
            ...
}

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class="normal">Answer

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)