function activityType($activity_type){
    switch ($activity_type) {
    case 0:
        echo "ERROR";
        break;
    case 1:
        return "are now following user ID ";
        break;
    case 2:
        return " have uploaded an photo, the photo ID is ";
        break;
}
}

function activityFeed($CurrentUser){
    $query = mysql_query("SELECT * FROM `follow` WHERE `user_id` = '$CurrentUser'") or trigger_error(mysql_error().$query);
    while($row = mysql_fetch_array($query)){
        @$following[] .= $row['follow_id']; // grabs a array of who current user is following e.g user_ids 3,8,34,75.

    }
    foreach($following as $k => $value){
    $query = mysql_query("SELECT * FROM `activity` WHERE `user_id` = '$value'") or trigger_error(mysql_error().$query); // grabs all activitys from each user i am following
        while($row = mysql_fetch_array($query)){// for every activty per user display the activty.
            @$activitys['id'][] = $row['id'];
            @$activitys['user_id'][] = $row['user_id'];
            @$activitys['source_id'][] = $row['source_id'];
            //$activity_type = activityType($row['activity_type']);
            //echo "I am following user $value . They ".$activity_type."".$row['source_id']."<br />";
        }
    }
}