merhaba şöyle bir hat alıyorum web sitemde:

Fatal error: Uncaught Error: Call to undefined function mysql_connect() in /home/mobilgir/public_html/includes/database.php:33 Stack trace: #0 /home/mobilgir/public_html/admin/includes/db_connect.php(2): include_once() #1 /home/mobilgir/public_html/admin/index.php(3): include('/home/mobilgir/...') #2 {main} thrown in /home/mobilgir/public_html/includes/database.php on line 33

database.php de satır 33 şöyle:

$connection = mysql_connect("$mysql_server","$mysql_user","$mysq l_password") or die ("Unable to connect to MySQL server.");

mysql bilgileri girili ama neden böyle bir hata alıyorum bilen var mı?