How can one identify the source of a file when including it using a subdomain in PHP, as described in the forum thread?

To identify the source of a file when including it using a subdomain in PHP, you can use the `$_SERVER['HTTP_HOST']` variable to get the current host name. This can help you determine if the file is being included from the main domain or a subdomain. By checking this variable, you can ensure that the file is being included from the correct source. 

$host = $_SERVER['HTTP_HOST'];

if ($host == 'example.com') {
    include 'maindomainfile.php';
} elseif ($host == 'subdomain.example.com') {
    include 'subdomainfile.php';
} else {
    echo 'Invalid host';
}

Keywords

subdomain file inclusion PHP source identification forum thread

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