PHP Classes

<?PHP

class levelAClass {

public $levelB;

const CLASSCONST = 'Level A';

function getA(){

echo self::CLASSCONST;

//echo ('getA');

}

}

class levelBClass {

const CLASSCONST = 'Level B';

function getB(){

echo self::CLASSCONST;

//echo ('getB');

}

}

?>

*********************************

<?PHP

require('levelABClases.php');

$levelA = new levelAClass();

echo $levelA->getA().'<br>';

$levelA->levelB = new levelBClass();

echo $levelA->levelB->getB();

?>

-----------------------------------------

Level A
Level B

_____________________________________

<?PHP

class levelAClass {

public $levelB;

const CLASSCONST = 'Level A';

function getA(){

echo self::CLASSCONST;

//echo ('getA');

}

}

class levelBClass {

public $levelR;

const CLASSCONST = 'Level B';

function getB(){

echo self::CLASSCONST;

//echo ('getB');

}

}

class levelRClass {

const CLASSCONST = 'Level R';

function getR(){

echo self::CLASSCONST;

//echo ('getB');

}

}

?>

***********************

<?PHP

require('levelABClases.php');

$levelA = new levelAClass();

echo $levelA->getA().'<br>';

$levelA->levelB = new levelBClass();

echo $levelA->levelB->getB().'<br>';

$levelA->levelB->levelR = new levelRClass();

echo $levelA->levelB->levelR->getR();

?>

-----------------------

Level A
Level B
Level R

____________________________________