摘要： http://www.php.net/manual/en/function.readfile.php404 File not found!" ); } // Gather relevent info about file $len = filesize ( $file ); $filename = basename ( $file ); $file_extension = strtolower ( substr ( strrchr ( $filename, "." ), 1 ) ); // This will set the Content-... 阅读全文