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<?php class Math { const pi = 3.14; } class CircleMath extends Math { public static function calculateArea($radius) { return parent::pi * pow($radius, 2); } } class Circle { private $radius = 1.0; private $color = 'white'; private $coordinates = array('x' => 0, 'y' => 0); public function __construct() { $args = func_get_args(); foreach ($args as $arg) { if (is_numeric($arg)) { $this->radius = doubleval($arg); } else if (is_string($arg)) { $this->color = $arg; } else if (is_array($arg)) { $this->coordinates = $arg; } } } public function calculateArea() { return CircleMath::calculateArea($this->radius); } public function get_radius() { return $this->radius; } public function get_color() { return $this->color; } public function get_coordinates() { return $this->coordinates; } } $className = 'Circle'; $circle = new $className(array('x' => 5, 'y' => 6)); $coordinates = $circle->get_coordinates(); print sprintf('The area of %s circle with radius %s and center positioned in (%s, %s) is: %s', $circle->get_color(), $circle->get_radius(), $coordinates['x'], $coordinates['y'], $circle->calculateArea()); ?>