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Editorial Team
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Asked: 2026-06-16T07:35:47+00:00

Doing some OO PHP. I’m getting undefined variables on line 11 and 31 and

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Doing some OO PHP. I’m getting undefined variables on line 11 and 31 and I’m not sure why.

http://pastebin.com/D0rNWdn3

<?php 

    class geometricObject {
        private $color;

        public function __construct($color){
            $this->color = $color;
        }

        public function getColor(){
            return $color;
        }

        public function setColor($color){
            $this->color = $color;
        }
    }

    class circle extends geometricObject {
        private $radius;

        public function __construct($radius, $color){
            parent::__construct($color);
            $this->radius = $radius;
        }

        public function getRadius(){
            return $radius;
        }

        public function getArea(){
            return (pi() * pow($radius, 2));
        }

        public function getSurfaceArea(){
            return (2 * pi() * $radius);
        }

        public function setRadius($radius){
            $this->radius = $radius;
        }
    }

?>

<?php 

    include_once 'templates/classes.php';

    $myCircle = new circle(10, "green");

    $circleArea = $myCircle->getArea();

    $color = $myCircle->getColor();

    include_once 'output.php';

?>

<html>
<body>

<?php echo $circleArea; echo $color; ?>

</body>
</html>
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1 Answer

  1. Editorial Team

    You’re getting the error because $color is undefined within the method scope. You only pass the $color argument to the constructor and the setColor method.

    To access it in other class methods you would use $this->color not $color

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