file_url_transform_relative($file_url)
Transforms an absolute URL of a local file to a relative URL.
May be useful to prevent problems on multisite set-ups and prevent mixed content errors when using HTTPS + HTTP.
Parameters
string $file_url: A file URL of a local file as generated by file_create_url().
Return value
string If the file URL indeed pointed to a local file and was indeed absolute, then the transformed, relative URL to the local file. Otherwise: the original value of $file_url.
See also
Related topics
- File interface
- Common file handling functions.
File
- core/includes/file.inc, line 250
- API for handling file uploads and server file management.
Code
function file_url_transform_relative($file_url) {
// Unfortunately, we pretty much have to duplicate Symfony's
// Request::getHttpHost() method because Request::getPort() may return NULL
// instead of a port number.
$request = \Drupal::request();
$host = $request->getHost();
$scheme = $request->getScheme();
$port = $request->getPort() ? : 80;
if (('http' == $scheme && $port == 80) || ('https' == $scheme && $port == 443)) {
$http_host = $host;
}
else {
$http_host = $host . ':' . $port;
}
return preg_replace('|^https?://' . $http_host . '|', '', $file_url);
}
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