Pieter Goosen Post Views

if ( ! function_exists( 'pietergoosen_get_post_views' ) ) :

function pietergoosen_get_post_views($postID){
    $count_key = 'post_views_count';
    $count = get_post_meta($postID, $count_key, true);
    if($count==''){
        delete_post_meta($postID, $count_key);
        add_post_meta($postID, $count_key, '0');
        return 0;
   }
   return $count;
}

endif;

// function to count views.
if ( ! function_exists( 'pietergoosen_update_post_views' ) ) :

function pietergoosen_update_post_views($postID) {
    if( !current_user_can('administrator') ) {
        $user_ip = $_SERVER['REMOTE_ADDR']; //retrieve the current IP address of the visitor
        $key = $user_ip . 'x' . $postID; //combine post ID & IP to form unique key
        $value = array($user_ip, $postID); // store post ID & IP as separate values (see note)
        $visited = get_transient($key); //get transient and store in variable

        //check to see if the Post ID/IP ($key) address is currently stored as a transient
        if ( false === ( $visited ) ) {

            //store the unique key, Post ID & IP address for 12 hours if it does not exist
           set_transient( $key, $value, 60*60*12 );

            // now run post views function
            $count_key = 'post_views_count';
            $count = get_post_meta($postID, $count_key, true);
            if($count==''){
                $count = 0;
                delete_post_meta($postID, $count_key);
                add_post_meta($postID, $count_key, '0');
            }else{
                $count++;
                update_post_meta($postID, $count_key, $count);
            }
        }
    }
}

endif;

remove_action( 'wp_head', 'adjacent_posts_rel_link_wp_head', 10, 0);

// initialzing
function wpb_track_post_views2 ($post_id) {
    if ( !is_single() ) return;
    if ( empty ( $post_id) ) {
        global $post;
        $post_id = $post->ID;
    }
    pietergoosen_update_post_views($post_id);
}
add_action( 'wp_head', 'wpb_track_post_views2');