Как найти пользователя по email

function memberoptions() {
global $exbb,$vars,$lang;

if (empty($vars['action']))
{
$inputfields = 'По имени <input type="text" name="username" maxlength="50" size="20" />
По E-mail <input type="text" name="usermail" maxlength="50" size="20" />
<input type="hidden" name="action" value="find" />
<input type="submit" name="usersubmit" value="'.$lang['Find_user'].'"/>';
}
else
{
$filedata = get_file($exbb['home_path'].'data/users.php');
$data = '';
$username = trim($vars['username']);
$usermail = trim($_POST['usermail']);
$usermail = vm($usermail);
if (empty($username) && empty($usermail))
{
adminerror($lang['User_admin'],"Не заданы критерии для поиска",'',0);
}
if (empty($username) && FALSE === vm($usermail))
{
adminerror($lang['User_admin'],"Неправильный формат E-mail адреса",'',0);
}
$username = strtolower($vars['username']);
$username = str_replace( "'" , ''', $username);
foreach ($filedata as $id=>$info)
{
if (preg_match("#^".preg_quote($username)."#is",$info['n']) && preg_match("#^".preg_quote($usermail)."#is",$info['m']))
{
$data .= '<option value="'.$id.'">'.$info['n'].'</option>';
}
}
if (empty($data))
{
adminerror($lang['User_admin'],$lang['User_notfound'],'',0);
}

$inputfields = '<select name="userid">'.$data.'</select>
<input type="hidden" name="action" value="edit_user" />
<input type="submit" name="usersubmit" value="'.$lang['Sel_user'].'"/>';

}
include('./admin/all_header.tpl');
include('./admin/user_select.tpl');
include('page_tail_admin.php');

}

<tr class="gen">
<td class="row1" align="center">$inputfields</td>
</tr>