Calling the constructor of the parent class
<?php class Cat { var $age; function Cat($new_age){ $this->age = $new_age; } function Birthday( ){ $this->age++; } function Eat( ){ echo "Chomp chomp."; } function Meow( ){ echo "Meow."; } } class MyCat extends Cat { function MyCat($new_age) { parent::Cat($new_age); } } ?>