";
}
function teachCmistry(){
echo "This teacher teaches Chemistry
";
}
function teachBiology(){
echo "This teacher teaches Biology
";
}
}
class GeneralTeacher extends ScienceTeacher{
function teachHistory(){
echo "This teacher teaches History
";
}
function teachBiology(){
echo "This teacher teaches Government
";
}
}
$teacher = new ScienceTeacher();
$teacher -> teachBiology();
$generalTeacher = new GeneralTeacher();
$generalTeacher -> teachBiology();
?>