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<?php //program to demonstrate inheritance example 2 class box { var $height; var $width; var $depth; function bgetdata() { $this->height=10; $this->width=20; $this->depth=30; } function volume() { $vol=$this->height*$this->width*$this->depth; print('volume of box is ' . $vol); print('<br>'); } } class colourbox extends box { var $colour; function getdata() { $this->colour='blue'; box::bgetdata(); } function showdata() { print('colour of box is ' . $this->colour); print('<br>'); box::volume(); } } $ob=new colourbox; $ob->getdata(); $ob->showdata(); ?>