Using the following code, files greater than 10Megs do not download. Less than 10 is working. Can anyone explain why? Files that will be downloaded are 5G plus in size.

    function download() {

        global $_GET;

        //Gather relevent info about file
        $file = "/user/dac420/tts/incoming/".$_GET['name'];
        $len = filesize($file);
        $filename = basename($file);
        $file_extension = strtolower(substr(strrchr($filename,"."),1));

        // Determine correct MIME type
        switch($file_extension){

            case "asf":     $ctype = "video/x-ms-asf";                break;
            case "avi":     $ctype = "video/x-msvideo";               break;
            case "exe":     $ctype = "application/octet-stream";      break;
            case "mov":     $ctype = "video/quicktime";               break;
            case "mp3":     $ctype = "audio/mpeg";                    break;
            case "mpg":     $ctype = "video/mpeg";                    break;
            case "mpeg":    $ctype = "video/mpeg";                    break;
            case "rar":     $ctype = "encoding/x-compress";           break;
            case "txt":     $ctype = "text/plain";                    break;
            case "wav":     $ctype = "audio/wav";                     break;
            case "wma":     $ctype = "audio/x-ms-wma";                break;
            case "wmv":     $ctype = "video/x-ms-wmv";                break;
            case "zip":     $ctype = "application/x-zip-compressed";  break;
            default:        $ctype = "application/force-download";    break;

        }

        //Begin writing headers
        header("Cache-Control:");
        header("Cache-Control: public");

        //Use the switch-generated Content-Type
        header("Content-Type: $ctype");

        if (strstr($_SERVER['HTTP_USER_AGENT'], "MSIE")) {
            # workaround for IE filename bug with multiple periods / multiple dots in filename
            # that adds square brackets to filename - eg. setup.abc.exe becomes setup[1].abc.exe
            $iefilename = preg_replace('/\./', '%2e', $filename, substr_count($filename, '.') - 1);
            header("Content-Disposition: attachment; filename=\"$iefilename\"");
        } else {
            header("Content-Disposition: attachment; filename=\"$filename\"");
        }

        header("Accept-Ranges: bytes");

        $size=filesize($file);

        //check if http_range is sent by browser (or download manager)
        if(isset($_SERVER['HTTP_RANGE'])) {

            list($a, $range)=explode("=",$_SERVER['HTTP_RANGE']);

            //if yes, download missing part
            str_replace($range, "-", $range);
            $size2=$size-1;
            $new_length=$size2-$range;

            header("HTTP/1.1 206 Partial Content");
            header("Content-Length: $new_length");
            header("Content-Range: bytes $range$size2/$size");

        } else {

            $size2=$size-1;
            header("Content-Range: bytes 0-$size2/$size");
            header("Content-Length: ".$size);

        }

        //open the file
        $fp=fopen("$file","rb");

        //seek to start of missing part
        fseek($fp,$range);

        //start buffered download
        while(!feof($fp)){

            //reset time limit for big files
            set_time_limit(0);

            print(fread($fp,filesize($file)));
            flush();
            ob_flush();

        }

        fclose($fp);
        exit;

    }

What error do you have ?

PHP Fatal error: Allowed memory size of 8388608
bytes exhausted (tried to allocate 11076561 bytes)

What I thought....

If your file is binary, there are many chances that the datas are stored on 1 big line.
You use fread, good. But you need to specify a "read up to" value below your max_memory threshold.
Right now, you ask it to get the whole file content in 1 operation.

PHP Code:

fread($fp,filesize($file)) 


You will need to split the processing in several parts.
Look at that comment for an example.
It should resolve your case.

PHP Code:

$total     = filesize($file);
$sent      = 0;
$blocksize = (2 << 20); //2M chunks
$handle    = fopen($file, "r");

while($sent < $total){
    echo fread($handle, $blocksize);
    $sent += $blocksize;
}
            
exit(0); 


And for those (like me) that didn't knew about the << operator, it's a "bitwise shift left".
http://www.php.net/manual/en/languag...rs.bitwise.php
Now, I need to understand what it does.....

Edit:
Ok, now, Wikipedia was really useful to understand it better. If any of you is interested:
http://en.wikipedia.org/wiki/Bitwise_operation

These two lines might help in your htaccess file:

php_value post_max_size 110M
php_value upload_max_filesize 100M

Originally Posted by mgraphic

These two lines might help in your htaccess file:

php_value post_max_size 110M
php_value upload_max_filesize 100M

Nope, they will not.
He sends a file for download, he's not receiving an upload.

He should alter the max_memory value if he would to achieve this without modifying the script, but he might hit the wall again the day a file definitively bigger than the max_memory will be downloaded.
It can go up to crashing the server because all it's memory would be dispatched to the script.

That's why I explained why to fix it rather than how raising the max_memory limit.

Wtf. You never should send files through php fread(). Install some lightweight webserver like nginx or lighttpd to send large static files with conditions check.

Thanks Trippy, your solution worked.

Now it seem my fseek() is failing... actually $_SERVER['HTTP_RANGE'] is never being set. How do i get this to set?

actually $_SERVER['HTTP_RANGE'] is never being set. How do i get this to set?

For that, I have no idea. Sorry.

PHP Code:

//seek to start of missing part
        fseek($fp,$range); 


it's because you don't set any $range value in your else.
Set it to 0 (I guess) and try again.

So now that I have the download working I need to know why the page is not refreshing at the end of the script. The download happen, then nothing. How do i get the page to continue after download?

hmm, don't know, as we don't see your page code.
But, did you tried to redirect after the end of the download() function ?

PHP Code:

header("location: /sompage.html");
die(); 


This is my function so far. I still haven't gotten the header() at the end to work, or the resume on fail feature. Still working on it.

PHP Code:

function download() {

    global $_GET,$_SERVER;

    require '../db/db.inc';
    $connection = mysql_connect($hostname,$username,$password);
    if (!($connection)) die ("can not connect");
    mysql_select_db($databasename,$connection);

    /*   update download count for file. update who downloaded - 3/1/2008 */
    $query_update = "UPDATE datalog SET timesdownloaded = timesdownloaded + 1 WHERE dataid = '".$_GET['id']."'";
    mysql_query($query_update,$connection);

    /*   update download count for file. update who downloaded - 3/1/2008 */
    $query_update = "INSERT INTO download_log (universalid,dataid,status) VALUES ('".$_SERVER['HTTP_SM_UNIVERSALID']."','".$_GET['id']."','1')";
    mysql_query($query_update,$connection);

    //Gather relevent info about file
    $file = "/user/dac420/tts/incoming/".$_GET['name'];
    $len = filesize($file);
    $filename = basename($file);
    $file_extension = strtolower(substr(strrchr($filename,"."),1));

    // Determine correct MIME type
    switch($file_extension){

        case "asf":     $ctype = "video/x-ms-asf";                break;
        case "avi":     $ctype = "video/x-msvideo";               break;
        case "exe":     $ctype = "application/octet-stream";      break;
        case "mov":     $ctype = "video/quicktime";               break;
        case "mp3":     $ctype = "audio/mpeg";                    break;
        case "mpg":     $ctype = "video/mpeg";                    break;
        case "mpeg":    $ctype = "video/mpeg";                    break;
        case "rar":     $ctype = "encoding/x-compress";           break;
        case "txt":     $ctype = "text/plain";                    break;
        case "wav":     $ctype = "audio/wav";                     break;
        case "wma":     $ctype = "audio/x-ms-wma";                break;
        case "wmv":     $ctype = "video/x-ms-wmv";                break;
        case "zip":     $ctype = "application/x-zip-compressed";  break;
        default:        $ctype = "application/force-download";    break;

    }

        //Begin writing headers
    header("Cache-Control:");
    header("Cache-Control: public");

    //Use the switch-generated Content-Type
    header("Content-Type: $ctype");

    if (strstr($_SERVER['HTTP_USER_AGENT'], "MSIE")) {
        # workaround for IE filename bug with multiple periods / multiple dots in filename
        # that adds square brackets to filename - eg. setup.abc.exe becomes setup[1].abc.exe
        $iefilename = preg_replace('/\./', '%2e', $filename, substr_count($filename, '.') - 1);
        header("Content-Disposition: attachment; filename=\"$iefilename\"");
    } else {
        header("Content-Disposition: attachment; filename=\"$filename\"");
    }

    header("Accept-Ranges: bytes");

    $size=filesize($file);

    //check if http_range is sent by browser (or download manager)
    if(isset($_SERVER['HTTP_RANGE'])) {

        list($a, $range)=explode("=",$_SERVER['HTTP_RANGE']);

        //if yes, download missing part
        str_replace($range, "-", $range);
        $size2=$size-1;
        $new_length=$size2-$range;

        header("HTTP/1.1 206 Partial Content");
        header("Content-Length: $new_length");
        header("Content-Range: bytes $range$size2/$size");

    } else {

        $size2=$size-1;
        header("Content-Range: bytes 0-$size2/$size");
        header("Content-Length: ".$size);

    }

    //open the file
    $fp=fopen($file,"rb");

    //seek to start of missing part
    fseek($fp,$range);

    //reset time limit for big files
    set_time_limit(0);

    //start buffered download
    while(!feof($fp)){

        $total     = filesize($file);
        $sent      = 0;
        $blocksize = (2 << 20); //2M chunks
        $handle    = fopen($file, "r");

        // Now we need to loop through the file and echo out chunks of file data
        // Dumping the whole file fails at > 30M!
        while($sent < $total){
            echo fread($handle, $blocksize);
            $sent += $blocksize;
        }

        @flush();
        @ob_flush();
    }

    fclose($fp);

header("location: /welcome.php");

} 


the header wont work if there is out put to the browser before it. so if there is no output it will work