HATA: Access denied for user 'root'@'localhost' (using password: NO)

<?php if(!defined("include")){ echo '<meta http-equiv="refresh" content="0;URL=/index.php">'; exit(); } 
   
  $dbhost = "localhost"; 
  $dbuser = "root"; //305176 
  $dbpass = ""; //01203486 
  $dbdata = "autoportal"; //305176 
   
  if (!@mysql_connect($dbhost, $dbuser, $dbpass)) { 
    die("Veritabanına bağlanılamadı...<br>HATA: ".mysql_error()); 
  } 
   
  if (!@mysql_select_db($dbdata)) { 
    die("Veritabanı seçilemedi<br>HATA: ".mysql_error()); 
  } 
   
  mysql_query("SET NAMES 'utf8'"); mysql_query("SET CHARACTER SET utf8"); mysql_query("SET COLLATION_CONNECTION = 'utf8_bin'"); 
   
  ?>