Brute force beveiliging $_POST

$username	= $_POST['username'];
$email_address	= $_POST['email_address'];

function beveilig($sInput) {
        $sOutput = '';
        if(!get_magic_quotes_gpc() == 0) {
                $sOutput = $sInput;              
        } else {
                if(function_exists('mysql_real_escape_string')) {
                        $sOutput = mysql_real_escape_string($sInput);     
                } else {
                        $sOutput = addslashes($sInput);         
                }
        }
        $sOutput = htmlentities($sOutput, ENT_QUOTES);
        return $sOutput;
}
function beveilig_array($aInput) {
        if(!is_array($aInput)) {
                return false;
        }
        $aOutput = array();
        foreach($aInput as $iKey => $sValue) {
                if(is_array($sValue)) {
                        $aOutput[beveilig($iKey)] = beveilig_array($sValue);            
                } else {
                        $aOutput[beveilig($iKey)] = beveilig($sValue);
                }
         }
        return $aOutput;
}

$_POST = beveilig_array($_POST);