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I'm trying the following:

$url = 'https://www.tripadvisor.es/Hotels-g187514-Madrid-Hotels.html'

$ta_html = file_get_html($url);
var_dump($ta_html);

it returns false, this is working and correctly getting the html for:

$url = 'https://www.tripadvisor.es/Hotels-g294316-Lima_Lima_Region-Hotels.html#ACCOM_OVERVIEW'

My first thought was that it had a redirect but I checked the headers with curl and its 200 ok and it seemed like the same on both cases. What can be happening? how it can be solved?

This seems to be a duplicate of this problem: Simple HTML DOM returning false that is also unanswered

Answers

It looks like HTML DOM parser is failing because the HTML file size is greater than the library's max file size. When you call file_get_html() it does a file size check based on it's MAX_FILE_SIZE constant. So before calling any HTML DOM parser methods, increase the max file size used by the library by calling:

define('MAX_FILE_SIZE', 1200000); // or larger if needed, default is 600000

Also as as you found out you can work around the file size check with doing this

$html = new simple_html_dom();
$html->load($str);