function SafeEval($sScript){
    $sStart = "ob_start('__buffCallback');";
    $sEnd = "\$r = ob_get_contents();ob_end_clean();return \$r;";
    $r = eval($sStart.$sScript.$sEnd);
    if(!is_string($r)){
        ob_end_clean();
    }elseif($r=='__buffCallback'){
        $r = ob_get_contents();
        ob_end_clean();
    }
    return $r;
}
function __buffCallback($b){return $b;}