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PHP

<!DOCTYPE html>
<html lang="de">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>Einsendeaufgabe 4</title>
<?php
require("berechnung.php");
require("setopt.php");
?>
</head>
<body>
<h1>Grundstückspreise</h1>
<?php berechnung() ?>
<fieldset>
<form method="post">
<p>
<label for="breite">Breite:</label>
<input type="text" name="breite" id="breite" placeholder="Breite?" required autofocus value="<?= htmlspecialchars($_POST['breite']) ?? '' ?>">
</p>
<p>
<label for="zahl2">Länge:</label>
<input type="text" name="laenge" id="laenge" placeholder="Länge?" required value="<?= htmlspecialchars($_POST['laenge']) ?? '' ?>">
</p>
<p>
<label for="pqm">Preis pro m²:</label>
<input type="text" name="pqm" id="pqm" placeholder="Preis / m²?" required value="<?= htmlspecialchars($_POST['pqm']) ?? '' ?>">
</p>
<p>
<label for="provision">Provisionssatz:</label>
<select name="provision" id="provision">
<?php setOption("0.03", "3");?>
<?php setOption("0.04", "4");?>
<?php setOption("0.05", "5");?>
<?php setOption("0.06", "6");?>
<?php setOption("0.07", "7");?>
</select>
</p>
<p>
<label for="mws">Mehrwertsteuer</label>
<input type="checkbox" name="mws" id="mws" value="0.19" <?= ($_POST['mws'] ?? '') == '0.19' ? 'checked' : '' ?>>
</p>
</fieldset>
<p>
<input type="submit" value="Berechnen">
</p>
</form>
</body>
</html>