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Diffuser le fichier binaire de MySQL à télécharger avec PHP

function getfile($blockid)
{
    global $msa_db;
    $sql = "select filename, filedata from blocks where blockid = '$blockid'";
    $query = mysql_query($sql, $msa_db);
    $result['filename'] = mysql_result($query,0,0);
    $result['filedata'] = mysql_result($query,0,1);
    return $result;

}

function download($fileinfo)
{
    $file = base64_decode($fileinfo['filedata']);
    header("Cache-Control: no-cache private");
    header("Content-Description: File Transfer");
    header('Content-disposition: attachment; filename='.$fileinfo['filename']);
    header("Content-Type: application/vnd.ms-excel");
    header("Content-Transfer-Encoding: binary");
    header('Content-Length: '. strlen($file));
    echo $file;
    exit;
}

$fileinfo = getfile($blockid);

download($fileinfo);