rgrade_export.php

<?php

header('Content-Type: application/vnd.ms-excel;charset=iso-8859-1');
header('Content-Disposition: attachment; filename=rgrade_' . time() . '.csv');
header('Pragma: no-cache');
header('Expires: 0');

$process = [&$_GET, &$_POST, &$_COOKIE, &$_REQUEST];

foreach ($process as $key => $val) {
    foreach ($val as $k => $v) {
        unset($process[$key][$k]);
        if (is_array($v)) {
            $process[$key][stripslashes($k)] = $v;
            $process[] = &$process[$key][stripslashes($k)];
        } else {
            $process[$key][stripslashes($k)] = stripslashes($v);
        }
    }
}

unset($process);

$table_utf8 = $_REQUEST['table'];

// Microsoft Word.
echo utf8_decode($table_utf8);