this is my solutions :
function removeLink($str){
$regex = '//isU';
preg_match_all($regex,$str,$result);
foreach($result[0] as $rs)
{
$regex = '/(.*)<\/a>/isU';
$text = preg_replace($regex,'$2',$rs);
$str = str_replace($rs,$text,$str);
}
return $str;}
dang tin rao vat