• http://us3.php.net/manual/en/function.ob-start.php
    21-Nov-2009 07:58

    Hey folks, as dan already noted, using the ob_gzhandler will make it impossible to get the content-length, and thusly will make the download of files a little ugly. the client cant show progress as it wont know how large it’s targeted download actually is. even if you write a custom handler, it seems impossible to set the buffer’s size to a global. the ob_handler seems to not share a global scope.i wrote a small php to solve that problem, by not using the ob_* functions, but rather gzencode manually:

        $file = $_REQUEST["file"] or die("Please specify the 'file' parameter.");
        $allowedExtensions = array(
            "jpg" => "image",
            "png" => "image",
            "gif" => "image"
        $path = pathinfo($file);
        if(!in_array(strtolower($path["extension"]), array_keys($allowedExtensions))) {
            header("HTTP/1.0 403 Access denied");
            die("403 You dont have access to that file, wether it exists or not.");
        $pack = true;
        if(!empty($_SERVER["HTTP_ACCEPT_ENCODING"]) && strpos("gzip",$_SERVER["HTTP_ACCEPT_ENCODING"]) === NULL)
            $pack = false;
        if(!is_file($file) || !is_readable($file)) {
            header("HTTP/1.0 404 Not Found");
            die("404 The file you are looking for is not available.");
        $buffer = file_get_contents($file);
        if($pack) {
            header("Content-Encoding: gzip");
            $buffer = gzencode($buffer,9,true);
        $length = strlen($buffer);
        header("Content-Type: {$allowedExtensions[$path["extension"]]}/{$path["extension"]}");   
        header("Content-Length: ".$length);
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