Kostenloses Kontakt-Formular-Plugin für WordPress

<?php
/*
Plugin Name: Simple Contact Form One Line
Description: Einfaches Kontaktformular mit Name, E-Mail, Betreff in einer Zeile und Datenschutzbestätigung.
Version: 1.1
Author: Dein Name
*/

if (!defined('ABSPATH')) {
    exit;
}

// Shortcode registrieren
function scf_display_form() {
    ob_start();
    ?>

    <form method="post" class="scf-form">

        <div class="scf-row">
            <input type="text" name="scf_name" placeholder="Name" required>
            <input type="email" name="scf_email" placeholder="E-Mail" required>
            <input type="text" name="scf_subject" placeholder="Betreff" required>
        </div>

        <textarea name="scf_message" placeholder="Nachricht" rows="5" required></textarea>

        <div class="scf-privacy">
            <label>
                <input type="checkbox" name="scf_privacy" required>
                Ich habe die <a href="/datenschutzerklaerung/" target="_blank">Datenschutzerklärung</a> gelesen und stimme zu.
            </label>
        </div>

        <button type="submit" name="scf_submit">Senden</button>

    </form>

    <style>
@media (min-width:769px) {
        .scf-form {
	width: 100%;
	margin: 0 auto;
        }

        .scf-row {
	display: flex;
	flex-direction: row;
	gap: 10px;
	width: 100%;
	margin-bottom: 10px;
        }

        .scf-row input {
	flex: 1;
	width: 100%;
	padding: 10px;
        }

        .scf-form textarea {
	width: 100%;
	padding: 10px;
	margin-bottom: 15px;
        }

        .scf-form button {
	padding: 10px 20px;
	color: #fff;
	border: none;
	cursor: pointer;
        }
        
        .scf-privacy {
	margin-bottom: 15px;
        }
}

@media (max-width:769px) {
        .scf-row {
	width: 100%;
        }

        .scf-row input {
	display: block;
	width: 100%;
	padding: 10px;
	margin-bottom: 10px;
        }
        
        .scf-privacy {
	margin-bottom: 15px;
        }
}

    </style>

    <?php

    if (isset($_POST['scf_submit'])) {
        scf_handle_form();
    }

    return ob_get_clean();
}

add_shortcode('simple_contact_form', 'scf_display_form');


// Formular verarbeiten
function scf_handle_form() {

    if (!isset($_POST['scf_privacy'])) {
        echo "<p style='color:red; margin-top: 15px;'>Bitte bestätigen Sie die Datenschutzerklärung.</p>";
        return;
    }

    $name    = sanitize_text_field($_POST['scf_name']);
    $email   = sanitize_email($_POST['scf_email']);
    $subject = sanitize_text_field($_POST['scf_subject']);
    $message = sanitize_textarea_field($_POST['scf_message']);

    $to = get_option('admin_email');
    $to_benutzer = $email;

    $headers = array(
        'Content-Type: text/html; charset=UTF-8'
    );

    $body = "
        <h3>Neue Kontaktanfrage</h3>
        <p><strong>Name:</strong> {$name}</p>
        <p><strong>E-Mail:</strong> {$email}</p>
        <p><strong>Betreff:</strong> {$subject}</p>
        <p><strong>Nachricht:</strong><br>{$message}</p>
        <p><strong>Datenschutz akzeptiert:</strong> Ja</p>
    ";

    wp_mail($to, $subject, $body, $headers);
    wp_mail($to_benutzer, $subject, $body, $headers);

    echo "<p style='color:green; margin-top: 15px;'>Vielen Dank! Ihre Nachricht wurde gesendet.</p>";
}