Função para Download

download.php

<?php

function downloadFile($file,$name,$mime_type=''){
    /*
    This function takes a path to a file to output ($file),
    the filename that the browser will see ($name) and
    the MIME type of the file ($mime_type, optional).

    If you want to do something on download abort/finish,
    register_shutdown_function('function_name');
    */

    if(!is_readable($file)) die('File not found or inaccessible!');

    $size = filesize($file);
    $name = rawurldecode($name);

    /* Figure out the MIME type (if not specified) */
    $known_mime_types = array(
        "pdf"=>"application/pdf",
        "txt"=>"text/plain",
        "html"=>"text/html",
        "htm"=>"text/html",
        "exe"=>"application/octet-stream",
        "zip"=>"application/zip",
        "doc"=>"application/msword",
        "xls"=>"application/vnd.ms-excel",
        "ppt"=>"application/vnd.ms-powerpoint",
        "gif"=>"image/gif",
        "png"=>"image/png",
        "jpeg"=>"image/jpg",
        "jpg"=> "image/jpg",
        "php"=>"text/plain"
    );

    if($mime_type==''){
        $file_extension = strtolower(substr(strrchr($file,"."),1));
        if(array_key_exists($file_extension, $known_mime_types)){$mime_type=$known_mime_types[$file_extension];
        }else $mime_type="application/force-download";
    };

   @ob_end_clean();// turn off output buffering to decrease cpu usage

    // required for IE, otherwise Content-Disposition may be ignored
    if(ini_get('zlib.output_compression')) ini_set('zlib.output_compression','Off');

    header('Content-Type: '.$mime_type);
    header('Content-Disposition: attachment; filename="'.$name.'"');
    header("Content-Transfer-Encoding: binary");
    header('Accept-Ranges: bytes');

    /* The three lines below basically make the
    download non-cacheable */
    header("Cache-control: private");
    header('Pragma: private');
    header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");

    // multipart-download and download resuming support
    if(isset($_SERVER['HTTP_RANGE'])){
        list($a, $range) = explode("=",$_SERVER['HTTP_RANGE'],2);
        list($range) = explode(",",$range,2);
        list($range,$range_end) = explode("-",$range);
        $range = intval($range);
        if(!$range_end){$range_end=$size-1;
        }else $range_end=intval($range_end);

        $new_length = $range_end-$range+1;
        header("HTTP/1.1 206 Partial Content");
        header("Content-Length: $new_length");
        header("Content-Range: bytes $range-$range_end/$size");
    }else{
        $new_length = $size;
        header("Content-Length: ".$size);
    }

    /* output the file itself */
    $chunksize = 1*(1024*1024); //you may want to change this
    $bytes_send = 0;
    if($file = fopen($file,'r')){
        if(isset($_SERVER['HTTP_RANGE'])) fseek($file, $range);
        while(!feof($file) && (!connection_aborted()) && ($bytes_send<$new_length)){
            $buffer = fread($file,$chunksize);
            echo($buffer);
            flush();
            $bytes_send+=strlen($buffer);
        }

        fclose($file);
       
    }else die('Error - can not open file.');

   return true;
}
?>