Book-page-137

<?php

class ParentClass{
    public function show($value){
        echo "Parent show({$value}) <br>";
    }
}

class ChildClass{
    public function show($value){
        echo "Child show({$value}) <br>";
    }
}

$parent = new ParentClass();
$parent->show(100);


$child = new ChildClass();
$child->show(50);

?>