add related-posts class

guaraci.php

@@ -9,4 +9,5 @@ License:     GPL2
 */
 
 require 'library/images.php';
+require 'library/related-posts.php';
 require 'pagebuilder-components/index.php';
\ No newline at end of file

library/related-posts.php

+<?php
+namespace guaraci;
+
+class related_posts {
+
+    static function init() {
+        add_action( 'admin_init', 'guaraci\\related_posts::settings_api_init' );
+    }
+
+    static function settings_api_init() {
+        add_settings_field(
+            'related_posts__use',
+            __('Posts Relacionados', 'guaraci'),
+            'guaraci\\related_posts::settings',
+            'reading',
+        );
+        
+        register_setting( 'reading', 'related_posts__use' );
+        register_setting( 'reading', 'related_posts__tags_weight' );
+        register_setting( 'reading', 'related_posts__categories_weight' );
+
+    }
+
+    static function settings() {
+        ?>
+        <p><label><input name="related_posts__use" id="related_posts__use" type="checkbox" value="1" class="code" <?= checked( 1, get_option( 'related_posts__use' ), false ) ?> /> <?php _e('Usar posts relacionados') ?></label></p>
+        <p><label><?php _e('Peso das tags') ?><br> <input name="related_posts__tags_weight" id="related_posts__tags_weight" type="number" step="0.1" value="<?= get_option('related_posts__tags_weight', 2) ?>" class="code" /></label></p>
+        <p><label><?php _e('Usar posts relacionados') ?><br> <input name="related_posts__categories_weight" id="related_posts__categories_weight" type="number" step="0.1" value="<?= get_option('related_posts__categories_weight', 1.5) ?>" class="code" /></label></p>
+        <?php
+    }
+
+
+    static function get_post_taxonomy_terms($post_id, $taxonomy){
+        $_terms = get_the_terms($post_id, $taxonomy) ?: [];
+
+        $_terms = array_map(function($el) {
+            return $el->term_taxonomy_id;
+        }, $_terms);
+
+        $result = implode(',', $_terms);
+        return $result ?: -1;
+    }
+
+
+    static function get_posts($post_id = null, $num = 6, $post_types = ['post']){
+        global $wpdb;
+
+        $post_types = implode("','", $post_types);
+
+        if(is_null($post_id)){
+            $post_id = get_the_ID();
+        }
+
+        $tags_multiplier = get_option('related_posts__tags_weight', 2);
+        $categories_multiplier = get_option('related_posts__categories_weight', 1.5);
+
+
+        $categories = self::get_post_taxonomy_terms($post_id, 'category');
+        $tags = self::get_post_taxonomy_terms($post_id, 'post_tag');
+
+        $tags_sql = "((SELECT COUNT(t1.term_taxonomy_id) * $tags_multiplier FROM $wpdb->term_relationships t1 WHERE t1.object_id = p.ID AND t1.term_taxonomy_id IN ($tags)))";
+        $cats_sql = "((SELECT COUNT(t2.term_taxonomy_id) * $categories_multiplier FROM $wpdb->term_relationships t2 WHERE t2.object_id = p.ID AND t2.term_taxonomy_id IN ($categories)))";
+        $date_sql = "
+        (3/ABS(datediff(
+            (SELECT post_date FROM $wpdb->posts WHERE ID = $post_id),
+            p.post_date
+        )))";
+
+        $sql = "
+        SELECT
+            p.ID,
+            (
+                $tags_sql + 
+                $cats_sql + 
+                $date_sql
+            ) AS num
+
+        FROM $wpdb->posts p
+        WHERE
+            p.post_type IN ('$post_types') AND
+            p.post_status = 'publish' AND
+            p.ID <> $post_id
+        GROUP BY p.ID
+        ORDER BY num DESC, ID ASC
+        LIMIT $num";
+
+        $result = $wpdb->get_results($sql);
+        // echo '<pre>';
+        // echo $sql;
+        // print_r($result);
+        // echo '</pre>';
+        $ids = array_map(function($el) { return $el->ID; }, $result);
+
+        if(!$ids) {
+            $ids = [-1];
+        }
+
+        $query = new \WP_Query([
+            'post__in' => $ids,
+            'post_type' => ['post'],
+            'posts_per_page' => -1,
+            'orderby' => 'post__in'
+        ]);
+
+        return $query;
+    }
+}
+
+related_posts::init();
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