bu kodun neresinde hata var ?

Notice:  Array to string conversion in C:\xampp\htdocs\bot.php on line 18
Array

$site = "http://www.site.com/?p=123";
$sitecek = file_get_contents($site);
$pattern = '#<title>(.*?)</title>#';
preg_match_all($pattern,$sitecek,$konu_baslik);
echo $konu_baslik;