function __construct($filter = null)
{
// set default filter if not provided
if (is_null($filter)) {
$filter = new BlogFilter();
}
$count = 0;
foreach (scandir(POSTS_PATH, SCANDIR_SORT_DESCENDING) as $fileName) {
// create blogPost object for each post and check against $filter
if (preg_match(POST_REGEX, $fileName)) {
$post = new BlogPost($fileName);
if ($post->matchFilter($filter)) {
// check if the matched post appears in the correct filter group
if ($count >= $filter->group * $filter->limit) {
// add post to blogList object
if (count($this->list) < $filter->limit) {
$this->list[] = $post;
} else {
$this->atEnd = false;
break;
}
}
}
$count++;
}
}
}
