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Get File Type by URL for a Remote File in WordPress
* Get the file mime type for a file by its URL.
* @param $url The URL to the file.
* @return The file mime type or empty string on failure.
function km_get_file_type_by_url( $url ) {
$response = wp_remote_get( $url );
return wp_remote_retrieve_header( $response, 'content-type' );
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