html - How to open a local file/url and include its output into another page via PHP

Hello I have a one page website (the entire site is in one page):

/index.html
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I want to wrap the header and footer of that page around another page inside a folder on the server:

/folder/newpage.php
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(with headers and footer of /index.html, but different content)

I've isolated the header and footer and saved them in separate files in the root:

/index_header.html
/index_footer.html
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If launched from the root they display correctly but I can't seem to include them in the "newpage.php" because none of the CSS, JS and images inside the header and footer are loaded.

I've tried the following 4 methods:

include($_SERVER["DOCUMENT_ROOT"].'/index_header.html');

file_get_contents($_SERVER["DOCUMENT_ROOT"].'/index_header.html');

ob_start();
include($_SERVER["DOCUMENT_ROOT"].'/index_header.html');
$output = ob_get_clean();
echo $output;

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://".$_SERVER['HTTP_HOST']."/index_header.html");
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$output = curl_exec($ch);
echo $output;
curl_close($ch);
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But none of these methods work... Can anyone help me out? Thank you

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