Function YeniSayfadaAc($icerik){
$metin = $icerik;
preg_match_all("/<a.*? href=\"(.*?)\".*?>(.*?)<\/a>/i", $metin, $matches);
for($i=0;$i<count($matches[0]);$i++){
if(!preg_match("/target=[\"\']*_blank[\"\']*/",$matches[0][$i])){
preg_match_all("/<a.*? href=\"(.*?)\"(.*?)>(.*?)<\/a>/i", $matches[0][$i], $matches1);
$metin = str_replace(">".$matches1[3][0]."</a>"," target=\"_blank\">".$matches1[3][0]."</a>",$text);
}
}
return $metin;
}
add_filter('the_content', 'YeniSayfadaAc');