$ilk = "<A HREF="http://www.siteadresi.com/" target=_blank>[b]Site[/b]</A>";
$ilk = str_replace("<A HREF="http://www.siteadresi.com/" target=_blank>", "", $andyou);
$ilk = str_replace("</A>", "", $andyou);
echo $andyou;