src/ImageResponse.php
private function usesXSendFile()
    {
        return isset($this->headers['x-sendfile']) &&
            isset($this->headers['content-lenght']) &&
            isset($this->headers['content-disposition']);
    }
private function usesXSendFile()
    {
        return isset($this->headers['x-sendfile']) &&
            isset($this->headers['content-lenght']) &&
            isset($this->headers['content-disposition']);
    }
private function usesXSendFile ( ) { return isset ( $ this -> headers [ 'x-sendfile' ] ) && isset ( $ this -> headers [ 'content-lenght' ] ) && isset ( $ this -> headers [ 'content-disposition' ] ) ; }
usesXSendFile

@return bool
usesXSendFile