{ function methodA($a) { echo $a; } function get() { echo "hello world"; } function methodB($b, $c) { var_dump($b . $c); } } $foo = new Foo(); var_dump($foo->methodB(1, 2)); /* ------------------------------------------------- *\ Interface segregation \* ------------------------------------------------- */ interface Storable { function setValue($name, $value); } class SessionStorage implements Storable { function setValue($name, $price) { // TODO: Implement setValue() method. } } class Cart