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"http://www.w3.org/TR/html4/strict.dtd">
<html lang="pl">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Parzysta Czy nie?</title>
</head>
<?php
// Funkcja wyświetlająca formularz
function formularz($liczba = "") {
?>
<form action="" method="post">
Wpisz Liczbe:<br />
<input name="liczba" value="<?= $liczba; ?>" /><br />
<input type="submit" value="Wyślij" name="submit"/>
</form>
<?php
}
?>
<body>
<?php
if (isset($_POST["submit"])) {
// Wyświetlamy formularz z wpisanymi wartościami poszczególnych pól
formularz($_POST["liczba"]);
// Sprawdzamy, czy wszystkie pola zostały zapełnione
if (empty($_POST["liczba"])) {
echo "<p style="color:red">Musisz wypełnić wszystkie pola!</p>";
} elseif($_POST["liczba"]%2 == 0){
// sprawdza czy $liczba przez 2 daje nam jakąś resztę, jeśli nie - wyświetli się komunikat, iż ta zmienna jest parzysta
echo "Mam super niusa - liczba $liczba jest parzysta";
}
} else {
// Jeśli strona ładowana pierwszy raz, wyświetlamy pusty formularz
formularz();
}
?>
</body>
</html>
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