<?php class Shape { public function area() { return 0; } public function sides () { return 0; } } class Rectangle extends Shape { public function area($width,$length) { $area = $width*$length; echo $area . ", "; } public function sides() { } } class Circle extends Shape { public function area($radius,$pi) { $area = pow($radius, 2)*$pi; echo $area . ", "; } public function sides() { } } class Square extends Shape { public function area($side) { $area = pow($side, 2); echo $area; } } $s = new Rectangle(); $s->area(3,15); $c = new Circle(); $c->area(3,3.14); $q = new Square(); $q->area(3);
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