function setPostViews($postID) {

    $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 = 'views';
        $count = get_post_meta($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);
        }


    }

}