<?php class foo { public function printItem($string) { echo 'foo: ' . $string . PHP_EOL; } public function printPHP() { echo 'PHP is great.' . PHP_EOL; } } class bar extends foo { public function printItem($string) { echo 'bar ' . $string . PHP_EOL; } } $foo = new foo(); $bar = new bar(); $foo->printItem('baz'); echo "<br>"; $foo->printPHP(); echo "<br>"; $bar->printItem('baz'); echo "<br>"; $bar->printPHP();