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==Class members" visibility==



<source lang="html4strict">

public: can be accessed by any other code
private: can be accessed only from within the same class.
protected: may be accessed from within the class and from within any class that extends that class.

</source>

==Class using access control==



<source lang="html4strict">

class Person {
public $name;
protected $age;
private $salary;
public function __construct() {
}
protected function set_age() {
}
private function set_salary() {
}
}

</source>

==Private and protected variables==



<source lang="html4strict">

<?php
class Staff
{
private $name;
private $title;
protected $wage;
protected function clockIn() {
echo "Member $this->name clocked in at ".date("h:i:s");
}
protected function clockOut() {
echo "Member $this->name clocked out at ".date("h:i:s");
}
}
?>

</source>

==Properties and methods marked as protected are accessible only through the object that owns them==



<source lang="html4strict">

<?
class Dog {
public $Name;
private function getName( ) {
return $this->Name;
}
}
class Poodle extends Dog {
public function bark( ) {
print ""Woof", says " . $this->getName( );
}
}
$poppy = new Poodle;
$poppy->Name = "Poppy";
$poppy->bark( );
?>

</source>

==protected member variable==



<source lang="html4strict">

<?php
class Staff
{
protected $name;
protected $title;
function __construct()
{
echo "<p>Staff constructor called!</p>";
}
}
class Manager extends Staff
{
function __construct()
{
parent::__construct();
echo "<p>Manager constructor called!</p>";
}
}
$employee = new Manager();
?>

</source>

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