<?php

function addiere($summand1, $summand2){
    return ($summand1 + $summand2);
}

function subtrahiere($minuend, $subtrahend) {
    return ($minuend - $subtrahend);
}

function multipliziere($faktor1, $faktor2) {

return ($faktor1 * $faktor2);

}

function dividiere($dividend, $divisor) {

if ($divisor != 0) {

return ($dividend / $divisor);

}

}
?>