<?php function berekenSom($a, $b) { return $a + $b; } $resultaat = ""; if (isset($_GET['getal1']) && isset($_GET['getal2'])) { $resultaat = berekenSom($_GET['getal1'], $_GET['getal2']); } ?> <form method="get"> Getal 1: <input type="number" name="getal1"> Getal 2: <input type="number" name="getal2"> <button type="submit">optellen</button> </form> <?php if ($resultaat !== "") { echo "Resultaat: " . $resultaat; } ?>
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