Assignment NO : 2 Function & Objects

Program 1 : Write PHP script to define an interface which has methods area(), volume(). Define constant PI. Create a class cylinder which implements this interface and calculate area and volume.

Answer : 

File : Index.php

<?php define("PI",3.14); $rad; $ht; $c; interface shape{ public function area($r,$h); public function volume($r,$h); } class cylinder implements shape{ public function area($r,$h){ $GLOBALS['rad']=$r; $GLOBALS['ht']=$h; $GLOBALS['c']= 2*PI*$GLOBALS['ht']*$GLOBALS['rad']; echo "Area of Cylinder = ". $GLOBALS['c'] ."<br>"; } public function volume($r,$h){ $GLOBALS['c']= PI*$GLOBALS['ht']*$GLOBALS['rad']*$GLOBALS['rad']; echo "Volume of Cylinder = ". $GLOBALS['c'] ."<br>"; } } $cy=new cylinder(); $cy->area(3,1); $cy->volume(5,3); ?>