1function setPostViews($postID) {
2
3    $user_ip = $_SERVER['REMOTE_ADDR']; //retrieve the current IP address of the visitor
4    $key = $user_ip . 'x' . $postID; //combine post ID & IP to form unique key
5    $value = array($user_ip, $postID); // store post ID & IP as separate values (see note)
6    $visited = get_transient($key); //get transient and store in variable
7
8    //check to see if the Post ID/IP ($key) address is currently stored as a transient
9    if ( false === ( $visited ) ) {
10
11        //store the unique key, Post ID & IP address for 12 hours if it does not exist
12        set_transient( $key, $value, 60*60*12 );
13
14        // now run post views function
15        $count_key = 'views';
16        $count = get_post_meta($postID, $count_key, true);
17        if($count==''){
18            $count = 0;
19            delete_post_meta($postID, $count_key);
20            add_post_meta($postID, $count_key, '0');
21        }else{
22            $count++;
23            update_post_meta($postID, $count_key, $count);
24        }
25
26
27    }
28
29}
30