PhpQuery не сохраняет изменения

<?php
require_once("phpQuery/phpQuery.php");
function request($url, $postdata = NULL, $cookiefile = "cookie.txt"){
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    /*curl_setopt($ch, CURLOPT_HEADER, true);*/
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:47.0) Gecko/20100101 Firefox/47.0');
    curl_setopt($ch, CURLOPT_COOKIEJAR, realpath($cookiefile));
    curl_setopt($ch, CURLOPT_COOKIEFILE, realpath($cookiefile));
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    if($postdata){
        curl_setopt($ch, CURLOPT_POSTFIELDS, $postdata);
    }
    $html = curl_exec($ch);
    curl_close($ch);
    return $html;
}
file_put_contents("cookie.txt", '');
 
 
$post = [
   'login_name' => '*******',
    'login_password' => '*******',
    'login' => 'submit',
];
$html = request("https://torrent-igruha.org/", $post);
phpQuery::newDocument($html);
 
$meta = pq("meta");
foreach($meta as $first){
    $first = pq($first);
    $first->attr('content', 'text/html; charset=utf-8');
    break;
}
 
echo $html;
phpQuery::unloadDocuments();