]+>([^<]+)<\/a>)/i", function($match){
return '[base]'.base64_encode($match[0]) .'[/base]';
}, $str);
$str = preg_replace("/(?))(".$tag_.")+/", "{$tag_}", $str);
}
$str = preg_replace_callback("/\[base\]([^\[]+)\[\/base\]/i", function($match){
return base64_decode($match[1]);
}, $str);
print_r($str) ;
?>