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includes/guest-authors.php

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+<?php
+/**
+ * WP Multi – Modul: Gast-Autoren
+ *
+ * Automatisch aus wp-multi.php ausgelagert. Wird über den Loader in
+ * wp-multi.php eingebunden (nur wenn das WP Multi Toolkit aktiv ist).
+ */
+
+if (!defined('ABSPATH')) { exit; }
+
+/*
+* Gast Autoren
+*/
+
+// Gast-Autor Eingabefeld in der Sidebar im Admin-Bereich hinzufügen
+function wp_multi_add_guest_author_field() {
+    add_meta_box(
+        'guest_author_meta_box',
+        __('Gast-Autor', 'wp-multi'),
+        'wp_multi_guest_author_field',
+        ['post', 'page', 'dein_custom_post_type'], 
+        'side',
+        'high'
+    );
+}
+add_action('add_meta_boxes', 'wp_multi_add_guest_author_field');
+
+// Callback-Funktion, die das Eingabefeld anzeigt
+function wp_multi_guest_author_field($post) {
+    $guest_author = get_post_meta($post->ID, '_guest_author', true);
+    wp_nonce_field('wp_multi_guest_author_nonce', 'wp_multi_guest_author_nonce_field');
+    ?>
+    <label for="guest_author"><?php _e('Gast-Autor Name:', 'wp-multi'); ?></label>
+    <input type="text" id="guest_author" name="guest_author" value="<?php echo esc_attr($guest_author); ?>" class="widefat" />
+    <?php
+}
+
+// Speichern der Gast-Autor Daten
+function wp_multi_save_guest_author_meta($post_id) {
+    if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) return;
+    if (!isset($_POST['wp_multi_guest_author_nonce_field']) || !wp_verify_nonce($_POST['wp_multi_guest_author_nonce_field'], 'wp_multi_guest_author_nonce')) return;
+    if (!current_user_can('edit_post', $post_id)) return;
+    if (isset($_POST['guest_author'])) {
+        $guest_author = sanitize_text_field(wp_unslash($_POST['guest_author']));
+        update_post_meta($post_id, '_guest_author', $guest_author);
+    } else {
+        delete_post_meta($post_id, '_guest_author');
+    }
+}
+add_action('save_post', 'wp_multi_save_guest_author_meta');
+
+// Gast-Autor anzeigen anstelle des regulären Autors im Frontend
+function wp_multi_display_guest_author($author_name) {
+    if ((is_single() || is_archive() || is_home()) && !is_admin()) {  
+        $post = get_post();
+        if ($post) {
+            $guest_author = get_post_meta($post->ID, '_guest_author', true);
+            if (!empty($guest_author)) {
+                $author_name = $guest_author;
+            }
+        }
+    }
+    return $author_name;
+}
+add_filter('the_author', 'wp_multi_display_guest_author');
+
+// Anzeige des Gast-Autors in der Beitragsübersicht (Backend)
+function wp_multi_add_guest_author_column($columns) {
+    if (isset($columns['author'])) {
+        $columns['guest_author'] = __('Gast-Autor', 'wp-multi');
+    }
+    return $columns;
+}
+add_filter('manage_posts_columns', 'wp_multi_add_guest_author_column');
+
+function wp_multi_display_guest_author_column($column_name, $post_id) {
+    if ($column_name == 'guest_author') {
+        $guest_author = get_post_meta($post_id, '_guest_author', true);
+        echo !empty($guest_author) ? esc_html($guest_author) : __('Kein Gast-Autor', 'wp-multi');
+    }
+}
+add_action('manage_posts_custom_column', 'wp_multi_display_guest_author_column', 10, 2);
+
+// Der Gast-Autoren-Menüpunkt wird zentral in wp_multi_register_admin_menus() registriert.
+
+// Callback-Funktion für die Gast-Autor-Übersicht
+function wp_multi_guest_author_overview_page() {
+    // Sortierparameter aus URL lesen
+    $orderby = isset($_GET['orderby']) ? sanitize_key($_GET['orderby']) : 'guest_author';
+    $order = isset($_GET['order']) && in_array(strtoupper($_GET['order']), ['ASC', 'DESC']) ? strtoupper($_GET['order']) : 'ASC';
+
+    // Gültige Sortierfelder
+    $valid_orderby = ['guest_author' => 'pm.meta_value', 'posts' => 'post_count'];
+    $sql_orderby = isset($valid_orderby[$orderby]) ? $valid_orderby[$orderby] : 'pm.meta_value';
+    $sql_order = $order;
+
+    // Basis-URL für Sortier-Links
+    $base_url = add_query_arg(['page' => 'guest_author_overview'], admin_url('admin.php'));
+
+    global $wpdb;
+    $query = "
+        SELECT pm.meta_value AS guest_author, COUNT(*) AS post_count
+        FROM {$wpdb->posts} p
+        INNER JOIN {$wpdb->postmeta} pm ON p.ID = pm.post_id
+        WHERE pm.meta_key = '_guest_author'
+        AND pm.meta_value != ''
+        AND p.post_status = 'publish'
+        GROUP BY pm.meta_value
+        ORDER BY {$sql_orderby} {$sql_order}
+    ";
+    $guest_authors = $wpdb->get_results($query);
+
+    wpmt_admin_page_open(
+        __('Gast-Autoren', 'wp-multi'),
+        __('Alle Gast-Autoren mit Anzahl ihrer veröffentlichten Beiträge', 'wp-multi')
+    );
+
+    wpmt_admin_card_open();
+    ?>
+    <div class="wpm-table-wrap">
+        <table class="wpm-table">
+            <thead>
+                <tr>
+                    <th>
+                        <a href="<?php echo esc_url(add_query_arg(['orderby' => 'guest_author', 'order' => ($orderby === 'guest_author' && $order === 'ASC') ? 'DESC' : 'ASC'], $base_url)); ?>">
+                            <?php _e('Gast-Autor', 'wp-multi'); ?>
+                            <?php if ($orderby === 'guest_author') : ?>
+                                <span><?php echo ($order === 'ASC') ? '↑' : '↓'; ?></span>
+                            <?php endif; ?>
+                        </a>
+                    </th>
+                    <th>
+                        <a href="<?php echo esc_url(add_query_arg(['orderby' => 'posts', 'order' => ($orderby === 'posts' && $order === 'ASC') ? 'DESC' : 'ASC'], $base_url)); ?>">
+                            <?php _e('Anzahl der Beiträge', 'wp-multi'); ?>
+                            <?php if ($orderby === 'posts') : ?>
+                                <span><?php echo ($order === 'ASC') ? '↑' : '↓'; ?></span>
+                            <?php endif; ?>
+                        </a>
+                    </th>
+                </tr>
+            </thead>
+            <tbody>
+                <?php if ($guest_authors) : ?>
+                    <?php foreach ($guest_authors as $author) : ?>
+                        <tr>
+                            <td><?php echo esc_html($author->guest_author); ?></td>
+                            <td><span class="wpm-badge"><?php echo esc_html($author->post_count); ?></span></td>
+                        </tr>
+                    <?php endforeach; ?>
+                <?php else : ?>
+                    <tr><td colspan="2"><?php _e('Keine Gast-Autoren gefunden.', 'wp-multi'); ?></td></tr>
+                <?php endif; ?>
+            </tbody>
+        </table>
+    </div>
+    <?php
+    wpmt_admin_card_close();
+
+    wpmt_admin_page_close();
+}
+
+
+// Funktion zum Erstellen der Gastautoren-Beitragsseite
+function wp_multi_create_guest_author_page() {
+    $page_title = __('Gastautor Beiträge', 'wp-multi');
+    $page_slug = 'gastautor-beitraege';
+    $page = get_page_by_path($page_slug);
+
+    if (!$page) {
+        $page_id = wp_insert_post(array(
+            'post_title' => $page_title,
+            'post_name' => $page_slug,
+            'post_content' => '[guest_author_posts]',
+            'post_status' => 'publish',
+            'post_type' => 'page',
+        ));
+
+        if ($page_id && !is_wp_error($page_id)) {
+            update_option('wp_multi_guest_author_page_id', $page_id);
+        }
+    } else {
+        update_option('wp_multi_guest_author_page_id', $page->ID);
+    }
+}
+add_action('init', 'wp_multi_create_guest_author_page');
+
+// Shortcode für Gastautoren-Liste
+function wp_multi_guest_author_shortcode() {
+    ob_start();
+    global $wpdb;
+
+    // Alle Gastautoren mit Beitragsanzahl abrufen
+    $query = "
+        SELECT pm.meta_value AS guest_author, COUNT(*) AS post_count
+        FROM {$wpdb->posts} p
+        INNER JOIN {$wpdb->postmeta} pm ON p.ID = pm.post_id
+        WHERE pm.meta_key = '_guest_author' 
+        AND pm.meta_value != '' 
+        AND p.post_status = 'publish'
+        GROUP BY pm.meta_value
+        ORDER BY pm.meta_value ASC
+    ";
+    $guest_authors = $wpdb->get_results($query);
+
+    // URL der Gastautoren-Beitragsseite
+    $guest_author_page_id = get_option('wp_multi_guest_author_page_id');
+    $guest_author_page_url = $guest_author_page_id ? get_permalink($guest_author_page_id) : '#';
+
+    ?>
+    <div id="guest-author-section" class="container mx-auto px-4 py-8">
+        <!-- Gastautoren-Liste -->
+        <div class="grid grid-cols-1 md:grid-cols-2 gap-6 mb-8">
+            <?php if ($guest_authors) : ?>
+                <?php foreach ($guest_authors as $author) : ?>
+                    <a href="<?php echo esc_url(add_query_arg('guest_author', urlencode($author->guest_author), $guest_author_page_url)); ?>" class="guest-author-card bg-white p-6 rounded-lg shadow-md hover:shadow-lg transition">
+                        <h3 class="text-xl font-semibold text-gray-800"><?php echo esc_html($author->guest_author); ?></h3>
+                        <p class="text-gray-600"><?php echo esc_html($author->post_count); ?> <?php _e('Beiträge', 'wp-multi'); ?></p>
+                    </a>
+                <?php endforeach; ?>
+            <?php else : ?>
+                <p class="col-span-2 text-center text-gray-600"><?php _e('Keine Gastautoren gefunden.', 'wp-multi'); ?></p>
+            <?php endif; ?>
+        </div>
+    </div>
+
+    <!-- Tailwind CSS CDN -->
+    <script src="https://cdn.tailwindcss.com"></script>
+    <?php
+
+    return ob_get_clean();
+}
+add_shortcode('guest_authors', 'wp_multi_guest_author_shortcode');
+
+// Shortcode für Gastautoren-Beiträge
+function wp_multi_guest_author_posts_shortcode() {
+    ob_start();
+
+    $guest_author = isset($_GET['guest_author']) ? sanitize_text_field(wp_unslash($_GET['guest_author'])) : '';
+
+    ?>
+    <div id="guest-author-posts" class="container mx-auto px-4 py-8">
+        <h2 class="text-2xl font-semibold text-gray-800 mb-4">
+            <?php
+            if ($guest_author) {
+                printf(__('Beiträge von %s', 'wp-multi'), esc_html($guest_author));
+            } else {
+                _e('Beiträge auswählen', 'wp-multi');
+            }
+            ?>
+        </h2>
+        <div class="grid grid-cols-1 md:grid-cols-2 gap-6">
+            <?php
+            if ($guest_author) {
+                $args = array(
+                    'post_type' => ['post', 'page', 'dein_custom_post_type'],
+                    'post_status' => 'publish',
+                    'meta_query' => array(
+                        array(
+                            'key' => '_guest_author',
+                            'value' => $guest_author,
+                            'compare' => '='
+                        )
+                    ),
+                    'tax_query' => array(
+                        array(
+                            'taxonomy' => 'category',
+                            'field' => 'slug',
+                            'terms' => 'series',
+                            'operator' => 'NOT IN'
+                        )
+                    ),
+                    'posts_per_page' => -1
+                );
+
+                $query = new WP_Query($args);
+
+                
+
+                if ($query->have_posts()) {
+                    while ($query->have_posts()) {
+                        $query->the_post();
+                        // Beitragsinhalt abrufen und kürzen
+                        $content = get_the_content();
+                        $content = wp_strip_all_tags($content); // HTML-Tags entfernen
+                        $trimmed_content = wp_trim_words($content, 30, '...');
+                        ?>
+                        <div class="post-card bg-white p-6 rounded-lg shadow-md">
+                            <h3 class="text-lg font-medium text-gray-800">
+                                <a href="<?php the_permalink(); ?>" class="hover:text-blue-600"><?php the_title(); ?></a>
+                            </h3>
+                            <p class="text-gray-600 line-clamp-3"><?php echo esc_html($trimmed_content); ?></p>
+                        </div>
+                        <?php
+                    }
+                    wp_reset_postdata();
+                } else {
+                    ?>
+                    <p class="col-span-2 text-gray-600"><?php _e('Keine Beiträge gefunden.', 'wp-multi'); ?></p>
+                    <?php
+                }
+            } else {
+                ?>
+                <p class="col-span-2 text-gray-600"><?php _e('Wählen Sie einen Gastautor aus, um die Beiträge anzuzeigen.', 'wp-multi'); ?></p>
+                <?php
+            }
+            ?>
+        </div>
+    </div>
+
+    <!-- Tailwind CSS CDN -->
+    <script src="https://cdn.tailwindcss.com"></script>
+    <?php
+
+    return ob_get_clean();
+}
+add_shortcode('guest_author_posts', 'wp_multi_guest_author_posts_shortcode');
+