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<?php |
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/* |
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Plugin Name: Manual Related Posts |
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Plugin URI: https://wordpress.org/plugins/related/ |
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Description: A simple 'related posts' plugin that lets you select related posts manually. |
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Version: 3.4.1 |
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Author: Marcel Pol |
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Author URI: https://timelord.nl |
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Text Domain: related |
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Domain Path: /lang/ |
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|
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|
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Copyright 2010 - 2012 Matthias Siegel (email: matthias.siegel@gmail.com) |
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Copyright 2013 - 2024 Marcel Pol (email: marcel@timelord.nl) |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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|
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/* |
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* Todo: |
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* |
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* - Add shortcode, so it can be used in the middle of a post as well. |
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* - Consider adding a filter with option for the_excerpt as well. |
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* - Add vice-versa linking through an option: |
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* https://wordpress.org/support/topic/automatic-vice-versa-linking/ |
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* - Remove option for 'any'. |
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* - Add AJAX for metabox, so no more memory problems getting all posts. |
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* |
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*/ |
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|
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|
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if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly |
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|
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|
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if ( ! class_exists('Related')) { |
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class Related { |
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|
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/* |
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* __construct |
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* Constructor |
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*/ |
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public function __construct() { |
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|
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// Set some helpful constants |
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$this->define_constants(); |
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|
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// Register hook to save the related posts when saving the post |
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add_action('save_post', array( &$this, 'save' )); |
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|
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// Start the plugin |
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add_action('admin_menu', array( &$this, 'start' ), 10); |
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|
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// Load the scripts |
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add_action('admin_enqueue_scripts', array( &$this, 'admin_scripts' )); |
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|
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// Load the CSS |
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add_action('admin_enqueue_scripts', array( &$this, 'admin_css' )); |
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add_action('wp_enqueue_scripts', array( &$this, 'frontend_css' )); |
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|
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// Add the related posts to the content, if set in options |
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add_filter( 'the_content', array( $this, 'related_content_filter' ), 22 ); |
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|
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// Add the related posts to the RSS Feed, if set in options |
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add_filter( 'the_excerpt_rss', array( $this, 'related_content_rss' ), 22 ); |
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add_filter( 'the_content', array( $this, 'related_content_rss' ), 22 ); |
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} |
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|
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|
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/* |
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* defineConstants |
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* Defines a few static helper values we might need |
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*/ |
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protected function define_constants() { |
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define('RELATED_VERSION', '3.4.1'); |
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define('RELATED_FILE', plugin_basename( __DIR__ )); |
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define('RELATED_ABSPATH', str_replace('\\', '/', WP_PLUGIN_DIR . '/' . plugin_basename( __DIR__ ))); |
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define('RELATED_URLPATH', plugins_url() . '/' . plugin_basename( __DIR__ )); |
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} |
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|
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|
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/* |
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* start |
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* Main function |
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*/ |
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public function start() { |
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|
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// Adds a meta box for related posts to the edit screen of each post type in WordPress |
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$related_show = get_option('related_show'); |
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$related_show = json_decode( $related_show ); |
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if ( empty( $related_show ) ) { |
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$related_show = array(); |
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$related_show[] = 'any'; |
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} |
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if ( in_array( 'any', $related_show ) ) { |
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foreach (get_post_types() as $post_type) { |
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$post_type = sanitize_text_field( $post_type ); |
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add_meta_box($post_type . '-related-posts-box', esc_html__('Related posts', 'related' ), array( &$this, 'display_metabox' ), $post_type, 'normal', 'high'); |
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} |
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} else { |
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foreach ($related_show as $post_type) { |
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$post_type = sanitize_text_field( $post_type ); |
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add_meta_box($post_type . '-related-posts-box', esc_html__('Related posts', 'related' ), array( &$this, 'display_metabox' ), $post_type, 'normal', 'high'); |
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} |
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} |
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|
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} |
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|
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|
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/* |
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* Load JavaScript for Admin |
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*/ |
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public function admin_scripts() { |
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wp_enqueue_script('jquery-ui-core'); |
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wp_enqueue_script('jquery-ui-sortable'); |
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wp_enqueue_script('related-scripts', RELATED_URLPATH . '/js/scripts.js', false, RELATED_VERSION, true); |
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wp_enqueue_script('related-chosen', RELATED_URLPATH . '/chosen/chosen.jquery.js', false, RELATED_VERSION, true); |
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} |
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|
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|
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/* |
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* Load CSS for Admin |
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*/ |
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public function admin_css() { |
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wp_enqueue_style('related-admin-css', RELATED_URLPATH . '/css/admin-style.css', false, RELATED_VERSION, 'all'); |
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wp_enqueue_style('related-chosen-css', RELATED_URLPATH . '/chosen/chosen.min.css', false, RELATED_VERSION, 'all'); |
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} |
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|
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|
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/* |
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* Load CSS for Frontend |
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*/ |
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public function frontend_css() { |
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wp_enqueue_style('related-frontend-css', RELATED_URLPATH . '/css/frontend-style.css', false, RELATED_VERSION, 'all'); |
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} |
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|
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/* |
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* save |
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* Save related posts when saving the post |
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* |
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* @param $post_id int ID of the current post. |
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*/ |
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public function save( $post_id ) { |
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global $pagenow; |
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|
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if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) |
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return; |
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if ( defined( 'DOING_AJAX' ) && DOING_AJAX ) |
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return; |
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if ( defined( 'DOING_CRON' ) && DOING_CRON ) |
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return; |
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|
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/* Check Nonce */ |
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$verified = false; |
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if ( isset($_POST['related_nonce']) ) { |
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$verified = wp_verify_nonce( $_POST['related_nonce'], 'related_nonce' ); |
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} |
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if ( $verified == false ) { |
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// Nonce is invalid. |
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return; |
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} |
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|
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if ( isset($_POST['related-posts']) ) { |
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$related_posts = $_POST['related-posts']; |
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$related_posts_new = array(); |
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foreach ( $related_posts as $related_post ) { |
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if ( $post_id == (int) $related_post ) { continue; } |
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$related_posts_new[] = (int) $related_post; // cast to int for security. |
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} |
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update_post_meta( $post_id, 'related_posts', $related_posts_new ); |
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} |
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/* Only delete on post.php page, not on Quick Edit. */ |
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if ( empty($_POST['related-posts']) ) { |
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if ( $pagenow == 'post.php' ) { |
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delete_post_meta($post_id, 'related_posts'); |
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} |
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} |
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} |
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|
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|
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/* |
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* display_metabox |
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* Creates the output on the post screen |
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*/ |
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public function display_metabox() { |
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global $post; |
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$post_id = $post->ID; |
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|
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/* Nonce */ |
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$nonce = wp_create_nonce( 'related_nonce' ); |
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echo '<input type="hidden" id="related_nonce" name="related_nonce" value="' . esc_attr( $nonce ) . '" />'; |
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|
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echo '<p>' . esc_html__('Choose related posts. You can drag-and-drop them into the desired order:', 'related' ) . '</p><div id="related-posts">'; |
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|
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// Get related posts if existing |
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$related = get_post_meta($post_id, 'related_posts', true); |
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|
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if ( ! empty($related)) { |
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foreach ($related as $r) { |
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if ( $post_id == $r ) { continue; } |
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$p = get_post( (int) $r ); |
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|
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if ( is_object( $p ) ) { |
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if ($p->post_status !== 'trash') { |
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echo ' |
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<div class="related-post" id="related-post-' . (int) $r . '"> |
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<input type="hidden" name="related-posts[]" value="' . (int) $r . '"> |
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<span class="related-post-title">' . esc_html( $p->post_title ) . ' (' . ucfirst(get_post_type($p->ID)) . ')</span> |
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<a href="#">' . esc_html__('Delete', 'related' ) . '</a> |
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</div>'; |
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} |
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} |
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|
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} |
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} |
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|
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/* First option should be empty with a data placeholder for text. |
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* The jQuery call allow_single_deselect makes it possible to empty the selection |
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*/ |
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echo ' |
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</div> |
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<p class="related-posts-select"> |
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<select class="related-posts-select chosen-select" name="related-posts-select" data-placeholder="' . esc_html__('Choose a related post... ', 'related' ) . '">'; |
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|
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echo '<option value="0"></option>'; |
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|
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|
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$related_list = get_option('related_list'); |
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$related_list = json_decode( $related_list ); |
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|
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if ( empty( $related_list ) || in_array( 'any', $related_list ) ) { |
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// list all the post_types |
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$related_list = array(); |
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|
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$post_types = get_post_types( '', 'names' ); |
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foreach ( $post_types as $post_type ) { |
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if ( $post_type === 'revision' || $post_type === 'nav_menu_item' ) { |
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continue; |
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} |
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$related_list[] = $post_type; |
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} |
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} |
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|
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foreach ( $related_list as $post_type ) { |
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|
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if ( is_post_type_hierarchical($post_type) ) { |
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$orderby = 'title'; |
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$order = 'ASC'; |
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} else { |
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$orderby = 'date'; |
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$order = 'DESC'; |
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} |
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echo '<optgroup label="' . ucwords($post_type) . ' ' . sprintf( esc_html__('(sorted on %s)', 'related'), $orderby ) . '">'; |
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|
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/* Use suppress_filters to support WPML, only show posts in the right language. */ |
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$query_args = array( |
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'nopaging' => true, |
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'posts_per_page' => 500, |
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'orderby' => $orderby, |
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'order' => $order, |
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'post_type' => $post_type, |
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'suppress_filters' => 0, |
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'post_status' => 'publish, inherit', |
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'exclude' => array( $post_id ), |
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); |
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|
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$posts = get_posts( $query_args ); |
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|
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if ( ! empty( $posts ) ) { |
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$args = array( $posts, 0, $query_args ); |
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|
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$walker = new Walker_RelatedDropdown(); |
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echo call_user_func_array( array( $walker, 'walk' ), $args ); |
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} |
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|
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echo '</optgroup>'; |
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|
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} // endforeach |
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|
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wp_reset_postdata(); |
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|
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echo ' |
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</select> |
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</p>'; |
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|
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} |
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|
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|
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/* |
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* show |
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* The frontend function that is used to display the related post list. |
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* |
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* Parameters: |
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* - Post ID: the post ID with the list of related posts. |
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* - Return: If true, returns a simple array of related posts to do as you please. |
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* If false (default), it will return a string with formatted HTML. |
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*/ |
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public function show( $id, $return = false ) { |
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|
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global $wpdb; |
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|
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/* Compatibility for Qtranslate, Qtranslate-X and Qtranslate-XT, and the get_permalink function */ |
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if ( function_exists( 'qtrans_convertURL' ) ) { |
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add_filter('post_type_link', 'qtrans_convertURL'); |
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} |
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if ( function_exists( 'qtranxf_convertURL' ) ) { |
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add_filter('post_type_link', 'qtranxf_convertURL'); |
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} |
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|
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if ( ! empty($id) && is_numeric($id)) { |
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$related = get_post_meta($id, 'related_posts', true); |
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|
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if ( ! empty($related)) { |
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$rel = array(); |
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foreach ($related as $r) { |
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$p = get_post( (int) $r ); |
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$rel[] = $p; |
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} |
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|
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// If value should be returned as array, return it. |
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if ($return) { |
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return $rel; |
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} |
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|
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// Otherwise return a formatted list |
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if ( is_array( $rel ) && count( $rel ) > 0 ) { |
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$extended_view = get_option('related_content_extended', 0); |
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if ( $extended_view ) { |
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$list = ' |
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<ul class="related-posts extended_view">'; |
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} else { |
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$list = ' |
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<ul class="related-posts">'; |
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} |
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foreach ($rel as $r) { |
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if ( is_object( $r ) ) { |
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if ($r->post_status !== 'trash') { |
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if ( $extended_view ) { |
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$thumb_id = get_post_thumbnail_id($r->ID); |
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$tn_size = apply_filters( 'related_show_post_tn_size', 'medium' ); |
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$tn = wp_get_attachment_image_src( $thumb_id, sanitize_text_field( $tn_size ) ); |
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$image_url = ''; |
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if ( isset($tn[0]) ) { |
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$image_url = $tn[0]; |
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} |
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$image_alt = get_post_meta( $thumb_id, '_wp_attachment_image_alt', true ); |
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if ( strlen($image_alt) == 0 ) { // No alt set for featured image, use the related post title. |
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$image_alt = get_the_title($r->ID); |
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} |
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$image = ''; |
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if ( strlen($image_url) > 0 ) { |
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$image = '<img src="' . $image_url . '" alt="' . $image_alt . '" class="related-post-image" />'; |
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} |
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$related_post = ' |
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<li class="related-post extended_view"> |
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<a href="' . get_permalink($r->ID) . '" class="related-post-link"> |
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' . $image |
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. '<span class="related-post-title">' . get_the_title($r->ID) . '</span> |
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</a> |
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</li>'; |
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/* |
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* Filter for developers, where you can change content, or add content. |
| 375 |
*/ |
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$related_post = apply_filters( 'related_show_post', $related_post, $r ); |
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$list .= $related_post; |
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} else { |
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$related_post = ' |
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<li class="related-post"> |
| 381 |
<a href="' . get_permalink($r->ID) . '">' . get_the_title($r->ID) . '</a> |
| 382 |
</li>'; |
| 383 |
/* |
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* Filter for developers, where you can change content, or add content. |
| 385 |
*/ |
| 386 |
$related_post = apply_filters( 'related_show_post', $related_post, $r ); |
| 387 |
$list .= $related_post; |
| 388 |
} |
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} |
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} |
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} |
| 392 |
$list .= ' |
| 393 |
</ul> |
| 394 |
<div style="clear:both;"></div>'; |
| 395 |
|
| 396 |
/* |
| 397 |
* Filter for developers, where you can change content, or add content. |
| 398 |
*/ |
| 399 |
$list = apply_filters( 'related_show_post_list', $list, $rel ); |
| 400 |
|
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return $list; |
| 402 |
} |
| 403 |
} else { |
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return false; |
| 405 |
} |
| 406 |
} else { |
| 407 |
return esc_html__('Invalid post ID specified', 'related' ); |
| 408 |
} |
| 409 |
} |
| 410 |
|
| 411 |
|
| 412 |
/* |
| 413 |
* Add the plugin data to the content, if it is set in the options. |
| 414 |
*/ |
| 415 |
public function related_content_filter( $content ) { |
| 416 |
if ( is_feed() ) { |
| 417 |
return $content; |
| 418 |
} |
| 419 |
if ( (get_option( 'related_content', 0 ) == 1 && is_singular() ) || get_option( 'related_content_all', 0 ) == 1 ) { |
| 420 |
global $related; |
| 421 |
$related_posts = $related->show( get_the_ID() ); |
| 422 |
if ( $related_posts ) { |
| 423 |
$content .= '<div class="related_content" style="clear:both;">'; |
| 424 |
$filtered_title = '<h3 class="widget-title">'; |
| 425 |
$filtered_title .= stripslashes(get_option('related_content_title', esc_html__('Related Posts', 'related'))); |
| 426 |
$filtered_title .= '</h3>'; |
| 427 |
$content .= apply_filters( 'related_content_title', $filtered_title ); |
| 428 |
$content .= $related_posts; |
| 429 |
$content .= '</div> |
| 430 |
'; |
| 431 |
} |
| 432 |
} |
| 433 |
// otherwise returns the old content |
| 434 |
return $content; |
| 435 |
} |
| 436 |
|
| 437 |
|
| 438 |
/* |
| 439 |
* Add the plugin data to the content of the RSS Feed. |
| 440 |
*/ |
| 441 |
public function related_content_rss( $content ) { |
| 442 |
if ( is_feed() && get_option( 'related_content_rss', 0 ) == 1 ) { |
| 443 |
global $related; |
| 444 |
$related_posts = $related->show( get_the_ID() ); |
| 445 |
if ( $related_posts ) { |
| 446 |
$content .= '<div class="related_content" style="clear:both;">'; |
| 447 |
$filtered_title = '<h3 class="widget-title">'; |
| 448 |
$filtered_title .= stripslashes(get_option('related_content_title', esc_html__('Related Posts', 'related'))); |
| 449 |
$filtered_title .= '</h3>'; |
| 450 |
$content .= apply_filters( 'related_content_title', $filtered_title ); |
| 451 |
$content .= $related_posts; |
| 452 |
$content .= '</div> |
| 453 |
'; |
| 454 |
} |
| 455 |
} |
| 456 |
// otherwise returns the old content |
| 457 |
return $content; |
| 458 |
} |
| 459 |
} |
| 460 |
|
| 461 |
} |
| 462 |
|
| 463 |
|
| 464 |
/** |
| 465 |
* Create HTML dropdown list of hierarchical post_types. |
| 466 |
* Returns the list of <option>'s for the select dropdown. |
| 467 |
*/ |
| 468 |
class Walker_RelatedDropdown extends Walker { |
| 469 |
/** |
| 470 |
* @see Walker::$tree_type |
| 471 |
* @since 2.1.0 |
| 472 |
* @var string |
| 473 |
*/ |
| 474 |
public $tree_type = 'page'; |
| 475 |
|
| 476 |
/** |
| 477 |
* @see Walker::$db_fields |
| 478 |
* @since 2.1.0 |
| 479 |
* @todo Decouple this |
| 480 |
* @var array |
| 481 |
*/ |
| 482 |
public $db_fields = array( 'parent' => 'post_parent', 'id' => 'ID' ); |
| 483 |
|
| 484 |
/** |
| 485 |
* @see Walker::start_el() |
| 486 |
* @since 2.1.0 |
| 487 |
* |
| 488 |
* @param string $output Passed by reference. Used to append additional content. |
| 489 |
* @param object $page Page data object. |
| 490 |
* @param int $depth Depth of page in reference to parent pages. Used for padding. |
| 491 |
* @param int $id |
| 492 |
*/ |
| 493 |
public function start_el( &$output, $page, $depth = 0, $args = array(), $id = 0 ) { |
| 494 |
$pad = str_repeat(' ', $depth * 3); |
| 495 |
|
| 496 |
$output .= "\t<option class=\"level-$depth\" value=\"" . esc_attr( $page->ID ) . "\">"; |
| 497 |
|
| 498 |
$title = $page->post_title; |
| 499 |
if ( '' === $title ) { |
| 500 |
$title = sprintf( esc_html__( '#%d (no title)', 'related' ), $page->ID ); |
| 501 |
} |
| 502 |
|
| 503 |
/** |
| 504 |
* Filter the page title when creating an HTML drop-down list of pages. |
| 505 |
* |
| 506 |
* @since 3.1.0 |
| 507 |
* |
| 508 |
* @param string $title Page title. |
| 509 |
* @param object $page Page data object. |
| 510 |
*/ |
| 511 |
$title = apply_filters( 'list_pages', $title, $page ); |
| 512 |
$output .= $pad . esc_html( $title ); |
| 513 |
$output .= "</option>\n"; |
| 514 |
} |
| 515 |
} |
| 516 |
|
| 517 |
|
| 518 |
/* |
| 519 |
* related_links |
| 520 |
* Add Settings link to the main plugin page |
| 521 |
* |
| 522 |
*/ |
| 523 |
function related_links( $links, $file ) { |
| 524 |
if ( $file === plugin_basename( __DIR__ . '/related.php' ) ) { |
| 525 |
$links[] = '<a href="' . esc_url( admin_url( 'options-general.php?page=related.php' ) ) . '">' . esc_html__( 'Settings', 'related' ) . '</a>'; |
| 526 |
} |
| 527 |
return $links; |
| 528 |
} |
| 529 |
add_filter( 'plugin_action_links', 'related_links', 10, 2 ); |
| 530 |
|
| 531 |
|
| 532 |
/* Include Settings page */ |
| 533 |
if ( is_admin() ) { |
| 534 |
require_once 'adminpages/page-related.php'; |
| 535 |
} |
| 536 |
|
| 537 |
/* Include widget */ |
| 538 |
require_once 'widgets/related-widget.php'; |
| 539 |
|
| 540 |
/* Include Double Up plugin */ |
| 541 |
require_once 'related_du.php'; |
| 542 |
|
| 543 |
|
| 544 |
/* |
| 545 |
* Load language files |
| 546 |
*/ |
| 547 |
function related_load_plugin_textdomain() { |
| 548 |
|
| 549 |
load_plugin_textdomain('related', false, dirname( plugin_basename( __FILE__ ) ) . '/lang/'); |
| 550 |
|
| 551 |
} |
| 552 |
add_action( 'init', 'related_load_plugin_textdomain' ); |
| 553 |
|
| 554 |
|
| 555 |
/* |
| 556 |
* Make an instance of Related() |
| 557 |
*/ |
| 558 |
function related_init() { |
| 559 |
|
| 560 |
// Start the plugin |
| 561 |
global $related; |
| 562 |
$related = new Related(); |
| 563 |
|
| 564 |
} |
| 565 |
add_action( 'plugins_loaded', 'related_init' ); |
| 566 |
|
