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1/**
2 * log_popular_categories
3 *
4 * This function logs popularity for categories when a user views an article on the website.
5 * How it works:
6 *     * User is given a hash based on their IP, user agent, the post ID and the date
7 *     * The hash is used to ensure that the popularity of the category only goes up once per user per post.
8 *     * A single user can traverse many articles in a category and that would increase the popularity for that category.
9 *     * However, a single user can only increase the popularity of a category once per post per day.
10 *     * Data is saved in the wp_options table under the option name: popular_categories_{category_id}
11 *     * This will later be retrieved by a WP CRON function that will parse the actual popularity.
12 */
13function log_popular_categories() {
14    global $post;
15
16    // Only run if we're on a single page.
17    if ( is_single( get_the_ID() ) ) {
18        $id         = get_the_ID(); // Get the ID
19        $date       = date( 'mdY' ); // Get the current date.
20        $categories = get_the_terms( $id, 'category' ); // Get all the categories associated with this post.
21
22        $hash = md5( $_SERVER['REMOTE_ADDR'] . $_SERVER['HTTP_USER_AGENT'] . $id . $date ); // Generate a hash. This is used to ensure that page reloads don't duplicate the popularity.
23
24        // Continue if there are categories associated with this post.
25        if ( $categories !== false ) {
26
27            // Loop through each category on the page and log each of the categories in the options table.
28            foreach ( $categories as $cat ) {
29
30                $options_name  = 'popular_categories_' . $cat->term_id;
31                $options_value = null;
32
33                $current_option_value = get_option( $options_name ); // Returns serialized string or false.
34
35
36                if ( $current_option_value !== false ) {
37                    // Option exists, unserialize the data, and add values.
38                    $options_value = unserialize( $current_option_value );
39
40
41                    if ( isset( $options_value[ $date ] ) ) {
42                        // Today's date is in the array.
43
44                        $options_value[ $date ][] = $hash; // Add the hash to the existing array.
45                        $options_value[ $date ]   = array_unique( $options_value[ $date ] ); // Filter out duplicate hashes.
46                    } else {
47                        // Today's date is not in the array.
48                        $options_value[ $date ] = array( $hash ); // Create an array for the current date and fill it with the hash.
49                    }
50
51                    update_option( $options_name, serialize( $options_value ) ); // Save to the database
52
53                } else {
54                    // Option doesn't exist, create it.
55
56                    $options_value = array(
57                        date( 'mdY' ) => array( $hash )
58                    );
59                    update_option( $options_name, serialize( $options_value ) ); // Save to the database
60                }
61            }
62        }
63    }
64}