217 lines
9.0 KiB
PHP
217 lines
9.0 KiB
PHP
<!DOCTYPE html>
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<html lang="de">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Zinsrechner</title>
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<style>
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body {
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font-family: Arial, sans-serif;
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background-color: #fff;
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color: #333;
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line-height: 1.6;
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margin: 0;
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padding: 20px;
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}
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.container {
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max-width: 600px;
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margin: 30px auto;
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background: #fff;
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padding: 30px;
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border-radius: 8px;
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box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
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border: 1px solid #a81212;
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}
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h1 {
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text-align: center;
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color: #a81212;
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margin-bottom: 30px;
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}
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.form-group {
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margin-bottom: 20px;
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}
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label {
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display: block;
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margin-bottom: 8px;
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font-weight: bold;
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}
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input[type="text"],
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input[type="date"],
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select {
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width: calc(100% - 22px);
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padding: 10px;
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border: 1px solid #a81212;
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border-radius: 4px;
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box-sizing: border-box;
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font-size: 16px;
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}
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input[type="submit"] {
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background-color: #a81212;
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color: white;
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padding: 12px 20px;
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border: none;
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border-radius: 4px;
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cursor: pointer;
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font-size: 16px;
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width: 100%;
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transition: background-color 0.3s ease;
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}
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input[type="submit"]:hover {
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background-color: #8f0e0e;
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}
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.result {
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background-color: #ffe5e5;
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border: 1px solid #a81212;
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color: #a81212;
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padding: 15px;
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border-radius: 5px;
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margin-top: 20px;
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font-size: 1.1em;
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text-align: center;
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}
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.error {
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background-color: #f8d7da;
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border: 1px solid #f5c6cb;
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color: #721c24;
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padding: 15px;
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border-radius: 5px;
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margin-top: 20px;
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font-size: 1.1em;
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text-align: center;
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}
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footer {
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text-align: center;
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margin-top: 40px;
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font-size: 0.9em;
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color: #777;
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}
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footer a {
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color: #a81212;
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text-decoration: none;
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}
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footer a:hover {
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text-decoration: underline;
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}
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</style>
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</head>
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<body>
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<div class="container">
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<h1>Zinsrechner</h1>
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<form action="" method="post">
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<div class="form-group">
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<label for="principal_amount">Kapital (Anlagebetrag):</label>
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<input type="text" id="principal_amount" name="principal_amount" value="<?php echo isset($_POST['principal_amount']) ? htmlspecialchars($_POST['principal_amount']) : ''; ?>" placeholder="z.B. 1000">
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</div>
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<div class="form-group">
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<label for="interest_rate">Zinssatz pro Jahr (%):</label>
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<input type="text" id="interest_rate" name="interest_rate" value="<?php echo isset($_POST['interest_rate']) ? htmlspecialchars($_POST['interest_rate']) : ''; ?>" placeholder="z.B. 3.5">
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</div>
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<div class="form-group">
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<label for="start_date">Startdatum:</label>
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<input type="date" id="start_date" name="start_date" value="<?php echo isset($_POST['start_date']) ? htmlspecialchars($_POST['start_date']) : ''; ?>">
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</div>
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<div class="form-group">
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<label for="end_date">Enddatum:</label>
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<input type="date" id="end_date" name="end_date" value="<?php echo isset($_POST['end_date']) ? htmlspecialchars($_POST['end_date']) : ''; ?>">
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</div>
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<div class="form-group">
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<label for="preset_years">Oder vordefinierte Jahre auswählen:</label>
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<select id="preset_years" name="preset_years">
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<option value="">Bitte auswählen</option>
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<option value="1" <?php echo (isset($_POST['preset_years']) && $_POST['preset_years'] == 1) ? 'selected' : ''; ?>>1 Jahr</option>
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<option value="2" <?php echo (isset($_POST['preset_years']) && $_POST['preset_years'] == 2) ? 'selected' : ''; ?>>2 Jahre</option>
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<option value="3" <?php echo (isset($_POST['preset_years']) && $_POST['preset_years'] == 3) ? 'selected' : ''; ?>>3 Jahre</option>
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<option value="4" <?php echo (isset($_POST['preset_years']) && $_POST['preset_years'] == 4) ? 'selected' : ''; ?>>4 Jahre</option>
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<option value="5" <?php echo (isset($_POST['preset_years']) && $_POST['preset_years'] == 5) ? 'selected' : ''; ?>>5 Jahre</option>
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<option value="10" <?php echo (isset($_POST['preset_years']) && $_POST['preset_years'] == 10) ? 'selected' : ''; ?>>10 Jahre</option>
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</select>
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</div>
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<div class="form-group">
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<input type="submit" name="calculate_interest" value="Zinsen berechnen">
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</div>
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</form>
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<?php
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$errors = [];
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if (isset($_POST['calculate_interest'])) {
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$principal_amount_input = trim($_POST['principal_amount']);
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$interest_rate_input = trim($_POST['interest_rate']);
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$start_date_input = trim($_POST['start_date']);
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$end_date_input = trim($_POST['end_date']);
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$preset_years = (int)$_POST['preset_years'];
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// Validate principal amount
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if (empty($principal_amount_input) || !is_numeric(str_replace(',', '.', $principal_amount_input))) {
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$errors[] = "Bitte geben Sie einen gültigen Kapitalbetrag ein.";
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} else {
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$principal_amount = (float)str_replace(',', '.', $principal_amount_input);
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if ($principal_amount <= 0) {
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$errors[] = "Der Kapitalbetrag muss positiv sein.";
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}
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}
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// Validate interest rate
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if (empty($interest_rate_input) || !is_numeric(str_replace(',', '.', $interest_rate_input))) {
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$errors[] = "Bitte geben Sie einen gültigen Zinssatz ein.";
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} else {
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$interest_rate = (float)str_replace(',', '.', $interest_rate_input);
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if ($interest_rate < 0) {
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$errors[] = "Der Zinssatz kann nicht negativ sein.";
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}
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}
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// Validate dates or preset years
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if (empty($start_date_input) || empty($end_date_input)) {
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if ($preset_years === 0) {
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$errors[] = "Bitte geben Sie entweder Start- und Enddatum an oder wählen Sie vordefinierte Jahre aus.";
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} else {
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$start_date = new DateTime();
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$end_date = new DateTime();
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$end_date->modify("+$preset_years years");
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}
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} else {
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try {
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$start_date = new DateTime($start_date_input);
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$end_date = new DateTime($end_date_input);
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if ($start_date >= $end_date) {
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$errors[] = "Das Enddatum muss nach dem Startdatum liegen.";
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}
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} catch (Exception $e) {
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$errors[] = "Ungültiges Datumsformat. Bitte verwenden Sie das Format JJJJ-MM-TT.";
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}
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}
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if (empty($errors)) {
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$interval = $start_date->diff($end_date);
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$days = $interval->days;
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// Simple interest calculation (adjust as needed for compound interest)
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$annual_interest = ($principal_amount * $interest_rate) / 100;
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$calculated_interest = ($annual_interest / 365) * $days;
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$final_amount = $principal_amount + $calculated_interest;
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echo '<div class="result">';
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echo '<h2>Ergebnis:</h2>';
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echo '<p>Kapital: <strong>' . number_format($principal_amount, 2, ',', '.') . ' €</strong></p>';
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echo '<p>Zinssatz: <strong>' . number_format($interest_rate, 2, ',', '.') . ' %</strong></p>';
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echo '<p>Anlagedauer: <strong>' . $days . ' Tage</strong></p>';
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echo '<p>Berechnete Zinsen: <strong>' . number_format($calculated_interest, 2, ',', '.') . ' €</strong></p>';
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echo '<p>Endbetrag: <strong>' . number_format($final_amount, 2, ',', '.') . ' €</strong></p>';
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echo '</div>';
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} else {
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echo '<div class="error">';
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foreach ($errors as $error) {
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echo '<p>' . $error . '</p>';
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}
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echo '</div>';
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}
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}
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?>
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</div>
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<footer>
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© <?php echo date("Y"); ?> <a href="https://wachtel-it.de" target="_blank">Philipp Wachtel</a>
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</footer>
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</body>
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</html>
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