php处理百度编辑器有误html

$con = htmlspecialchars_decode($con);
$con = preg_replace('/<img[^>]{0,}spacer[^>]{0,}>/is', '', $con);
$con = preg_replace('/<br[^>]{0,}>/is', '', $con);
$kg = htmlspecialchars_decode('&nbsp;');
$con = preg_replace('/<span[^>]{0,}>[\s' . $kg . ']{0,}<\/span>/is', '', $con);
$con = preg_replace('/<p[^>]{0,}>[\s' . $kg . ']{0,}<\/p>/is', '', $con);
return $con;