Simulate a real browser in curl - php

Question

for some time I have been trying to write the ideal browser simulations, for this purpose I wrote a script that to some extent simulates the browser and works correctly on many pages with ssl. Recently during the test site pornhub.com and wikipedia.com encountered a strange error in my script, just for pornhub after a few page reloads shows the status of header "Loading .. Content-length: 1456" and the number of loaded data changes in real time on smaller and larger values. I have a question for already very experienced and professional programmers: Have you met with such a situation, if so you have any hints or corrections for my script ?.
I post my code (test for wikipedia). If you fire it on 3 browser tabs and you will refresh, you will get an error.
<?php
function curl($url)
{
$headers = [
'Accept-Language: pl,en-US;q=0.9,en;q=0.8',
'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8',
'User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36'
];
$cookie = 'cookie.txt';
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_MAXREDIRS, 5);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_VERBOSE, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 0);
curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_TIMEOUT, 10);
curl_setopt($ch, CURLOPT_REFERER, 'https://www.wikipedia.org');
curl_setopt($ch, CURLOPT_ENCODING, 'gzip');
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
if (!file_exists($cookie)){
curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie);
}else{
curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie);
}
$c = curl_exec($ch);
curl_close($ch);
return $c;
}
echo curl('https://www.wikipedia.org');
?>