<?php
    print_r("1. feladata\n");
    function Greeting($hello = false) {
        echo ($hello)?'Hello':'Bye';
    }

    Greeting(true);

    print_r("\n2. feladat\n");
    $input = "1,2,3,4,5,6,7";
    echo array_sum(explode(',',$input));

?>