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<?php

class car{

public $make = 'kia';

public $model = 'optima';

public function __construct($make = NULL, $model = NULL){

if($make != NULL){

$this->make = $make;

}

if($model != NULL){

$this->model = $model;

}

}

}

class vehicle extends car{

}

$obj1 = new car('chrysler', 't&c');

$obj = new vehicle('ford', 'explorer');

print_r($obj);

print_r($obj1);

?>