url leri _blank yapmak icin
function blank_yap($content) {
$text = $content;
preg_match_all("/<a.*? href=\"(.*?)\".*?>(.*?)<\/a>/i", $text, $matches);
for($i=0;$i<count($matches[0]);$i++){
if(!preg_match("/target=[\"\']*_blank[\"\']*/",$matches[0][$i])){
preg_match_all("/<a.*...