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Posted by J.O. Aho on 07/31/06 14:18
Lupus Yonderboy wrote:
> Having the need to make some videos available for download from my website,
> some time ago I created a script by putting together some snippets from
> different examples found on the net (the first one was from php.net function
> reference), until everything appeared to run smoothly. The file types I
> wanted to release through the download function are .avi, .wmv, .mov and
> .mp4. For some time everything went peachy, until recently I uploaded
> another video and I noticed that my script doesn't work with files above a
> given filesize, say around 20 Mb: Firefox opens the small download window on
> the bottom right and it closes right away, saving a 0 byte file; IE6 does
> just the same, besides it names the file wrongly (with the name of the .php
> file containing the call to the download script). Can anybody provide an
> hint? The script follows:
in your php.ini you limit the amount of memory that a php script can use, this
limits the size of things for you, say around 20Mb in your case.
> <?php
> function getfile($name, $file){
>
> $len = filesize($file);
> $filename = basename($file);
> $file_extension = strtolower(substr(strrchr($filename,"."),1));
>
>
> //This will set the Content-Type to the appropriate setting for the file
> switch( $file_extension ) {
> case "mov": $ctype="video/quicktime"; break;
> case "avi": $ctype="video/x-msvideo"; break;
> case "wmv": $ctype="video/x-msvideo"; break;
>
> //The following are for extensions that shouldn't be downloaded
> //(sensitive stuff, like php files)
> case "php":
> case "htm":
> case "html":
> case "txt": die("<b>Cannot be used for ". $file_extension ."
> files!</b>"); break;
>
> default: $ctype="application/force-download";
> }
>
>
> //Begin writing headers
> header("Pragma: public");
> header("Expires: 0");
> header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
> header("Cache-Control: public");
> header("Content-Description: File Transfer");
>
> //Use the switch-generated Content-Type
> header("Content-Type: $ctype");
>
> //Force the download
> $header="Content-Disposition: attachment; filename=\"$name\";";
> header($header );
> header("Content-Transfer-Encoding: binary");
> header("Content-Length: ".$len);
> @readfile($file);
> exit;
> }
> ?>
I think fpassthru() uses less memory, as long as you don't use
ob_start()/ob_flush()
For more info, see http://www.php.net/manual/en/function.fpassthru.php
//Aho
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