Генерирую сайт на php - получаю код html в одну строку. Почему?

require ('simple_html_dom.php');
set_time_limit(0);
$filearray = glob("xml/*.xml");
echo "Was found ".count($filearray).'txt files<br>';
$cat = ceil(count($filearray)/50.0);
$string_cats = '<a href="index.html">1</a>  ';
for($j = 2; $j <= $cat; $j++){
    $string_cats.='<a href="cat_'.$j.'.html">'.$j.'</a>  ';
}
var_dump($filearray);
//die;
 
$count = 1;
 
$html = new simple_html_dom();
$html = file_get_html('template.html');
 
//$index = new simple_html_dom();
$index = fopen('index.html', 'r');
//$index = file_get_html('index.html');
$index_html = fread($index, 100000);
$new_cats = $index_html;
$count_cat = 1;
$current_cat = ('html/index.html');
 
 
$sitemap = fopen('sitemap.html', 'r');
$sitemap_html = fread($sitemap, 100000);
 
 
foreach($filearray as $files_name){
   
$xml = simplexml_load_file($files_name,SimpleXMLElement,LIBXML_NOCDATA );
$my_post = array();
 
 
foreach ($xml as  $key => $value) {
  $my_post["$key"] = trim($value);
  
}
$b = $html -> find('#post', 0);
$b->outertext = $my_post['post'];
$b = $html -> find('#mytitle', 0);
$b->outertext = '<h2>'.$my_post['title'].'</h2>';
$b = $html -> find('title', 0);
$b->innertext = $my_post['title'];
$b = $html -> find('cats', 0);
$b->outertext = $string_cats;
 
    $html -> save('html/article_'.$count.'.html');
    //$a = $index -> find('next_search', 0);
    $short_post = substr($my_post['post'], 0, 255);
    $short_post .="...";
    $new_cats = str_replace('<next_search></next_search>', '<p><h2><a href="article_'.$count.'.html" title="'.$my_post['title'].'">'.$my_post['title'].'</a></h2>'
    .$short_post.'</p>'."\r\n<next_search></next_search>", $new_cats);
    
    //$a->outertext = '<p><h2><a href="article_'.$count.'.html" title="'.$my_post['title'].'">'.$my_post['title'].'</a></h2>'.$short_post.'</p>'."\r\n<next_search></next_search>";
    $sitemap_html = str_replace('<next_search></next_search>', '<p><a href="article_'.$count.'.html" title="'.$my_post['title'].'">'.$my_post['title'].'</a></p>'."\r\n<next_search></next_search>", $sitemap_html);
    $count++;
    if(($count%50) == 0){
        //$a = $index -> find('next_search', 0);
        //$a->outertext = '';
        $new_cats = str_replace('<next_search></next_search>', '', $new_cats);
        $new_cats = str_replace('<cats></cats>', $string_cats, $new_cats);
        $handle = fopen($current_cat, 'w+');
        fwrite($handle, $new_cats);
        fclose($handle);
        //$index ->save($current_cat);
        $count_cat++;
        //$index ->clear();
        //$index = file_get_html('index.html');
        $current_cat = ('html/cat_'.$count_cat.'.html');
        $new_cats = $index_html;
    } 
    //$cat_html = str_replace('<next_search></next_search>', '<p><a href="article_'.$count.'.html" title="'.$title.'">'.$title.'</a></p>'."\r\n<next_search></next_search>", $cat_html);
    
    
}
$new_cats = str_replace('<next_search></next_search>', '', $new_cats);
$new_cats = str_replace('<cats></cats>', $string_cats, $new_cats);
$handle = fopen($current_cat, 'w+');
fwrite($handle, $new_cats);
fclose($handle);
$sitemap_html = str_replace('<next_search></next_search>', '', $sitemap_html);
$sitemap_html = str_replace('<cats></cats>', $string_cats, $sitemap_html);
$new_sitemap = fopen('html/sitemap.html', 'w+');
fwrite($new_sitemap, $sitemap_html);
fclose($new_sitemap);
fclose($sitemap);

$html = file_get_html('template.html', false, null, -1, -1, true, true, DEFAULT_TARGET_CHARSET, false);

$html = file_get_html('template.html', false, null, -1, -1, true, true, DEFAULT_TARGET_CHARSET, false);