Related Posts function - functions.php

wp-content/themes/mag-wp/functions.php

@@ -900,4 +900,130 @@ function custom_breadcrumbs() {
 
         echo '</ul>';
 	}
+}
+
+// ---------------------------------------------------------------------------------------------------- 
+// New function for Related Posts 
+// -- It picks from tags first, then categories, and excludes all posts from Recent Posts query - Andre
+// ---------------------------------------------------------------------------------------------------- 
+function get_max_related_posts( $recent_posts = '', $taxonomy_1 = 'post_tag', $taxonomy_2 = 'category', $total_posts = 4 ) {
+	// First, make sure we are on a single page, if not, bail
+	if ( !is_single() )
+	    return false;
+
+	// Sanitize and vaidate our incoming data
+	if ( 'post_tag' !== $taxonomy_1 ) {
+	    $taxonomy_1 = filter_var( $taxonomy_1, FILTER_SANITIZE_STRING );
+	    if ( !taxonomy_exists( $taxonomy_1 ) )
+	        return false;
+	}
+
+	if ( 'category' !== $taxonomy_2 ) {
+	    $taxonomy_2 = filter_var( $taxonomy_2, FILTER_SANITIZE_STRING );
+	    if ( !taxonomy_exists( $taxonomy_2 ) )
+	        return false;
+	}
+
+	if ( 4 !== $total_posts ) {
+	    $total_posts = filter_var( $total_posts, FILTER_VALIDATE_INT );
+	        if ( !$total_posts )
+	            return false;
+	}
+
+	// Everything checks out and is sanitized, lets get the current post
+	$current_post = sanitize_post( $GLOBALS['wp_the_query']->get_queried_object() );
+
+	// Lets get the first taxonomy's terms belonging to the post
+	$terms_1 = get_the_terms( $current_post, $taxonomy_1 );
+
+	// Set a varaible to hold the post count from first query
+	$count = 0;
+	// Set a variable to hold the results from query 1
+	$q_1   = [];
+
+	// Make sure we have terms
+	if ( $terms_1 ) {
+	    // Lets get the term ID's
+	    $term_1_ids = wp_list_pluck( $terms_1, 'term_id' );
+
+	    $exclude = array_merge( [$current_post->ID], $recent_posts );
+
+	    // Lets build the query to get related posts
+	    $args_1 = [
+	        'post_type'      => $current_post->post_type,
+	        'post__not_in'   => $exclude,
+	        'posts_per_page' => $total_posts,
+	        'fields'         => 'ids',
+	        'tax_query'      => [
+	            [
+	                'taxonomy'         => $taxonomy_1,
+	                'terms'            => $term_1_ids,
+	                'include_children' => false
+	            ]
+	        ],
+	    ];
+	    $q_1 = get_posts( $args_1 );
+	    // Count the total amount of posts
+	    $q_1_count = count( $q_1 );
+
+	    // Update our counter
+	    $count = $q_1_count;
+	}
+
+	// We will now run the second query if $count is less than $total_posts
+	if ( $count < $total_posts ) {
+	    $terms_2 = get_the_terms( $current_post, $taxonomy_2 );
+	    // Make sure we have terms
+	    if ( $terms_2 ) {
+	        // Lets get the term ID's
+	        $term_2_ids = wp_list_pluck( $terms_2, 'term_id' );
+
+	        // Calculate the amount of post to get
+	        $diff = $total_posts - $count;
+
+	        // Create an array of post ID's to exclude
+	        if ( $q_1 ) {
+	            $exclude = array_merge( $exclude, $q_1 );
+	        }
+
+	        $args_2 = [
+	            'post_type'      => $current_post->post_type,
+	            'post__not_in'   => $exclude,
+	            'posts_per_page' => $diff,
+	            'fields'         => 'ids',
+	            'tax_query'      => [
+	                [
+	                    'taxonomy'         => $taxonomy_2,
+	                    'terms'            => $term_2_ids,
+	                    'include_children' => false
+	                ]
+	            ],
+	        ];
+	        $q_2 = get_posts( $args_2 );
+
+	        if ( $q_2 ) {
+	            // Merge the two results into one array of ID's
+	            $q_1 = array_merge( $q_1, $q_2 );
+	        }
+	    }
+	}
+
+	// Make sure we have an array of ID's
+	if ( !$q_1 )
+	    return false;
+
+	// Run our last query, and output the results
+	$final_args = [
+	    'ignore_sticky_posts' => 1,
+	    'post_type'           => $current_post->post_type,
+	    'posts_per_page'      => count( $q_1 ),
+	    'post__in'            => $q_1,
+	    'order'               => 'ASC',
+	    'orderby'             => 'post__in',
+	    'suppress_filters'    => true,
+	    'no_found_rows'       => true
+	];
+	$final_query = new WP_Query( $final_args );
+
+	return $final_query;
 }