mysqli_select_db（）期望参数1为mysqli，给定字符串＆mysqli_error（）需要1个参数，0在DATABASE_CONNECT_ERROR [duplicate]中给出

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• Warning: mysqli_select_db() expects exactly 2 parameters, 1 given in C:\ [duplicate] 1 answer

Ive searched on here and various other places and I just cannot find the answer to solve this problem. I just bought new hosting and am trying to move my sites. I am getting the error below.

Warning: mysqli_select_db() expects parameter 1 to be mysqli, string given in
/home4/purefic/public_html/demo/mytcg/settings.php on line 230

Warning: mysqli_error() expects exactly 1 parameter, 0 given in
/home4/purefic/public_html/demo/mytcg/settings.php on line 231
DATABASE_CONNECT_ERROR

And this is the coding I have on my settings page (originally working just fine on my old host I had everything as mysql and not mysqli like my research seemed to tell me to change to but as you can see it didnt work)

$users = array($user => md5($pass));
$salt = substr(md5(date("F")), 8);

$connect = mysqli_connect("$db_server", "$db_user", "$db_password")
    or die( DATABASE_CONNECT_ERROR . mysqli_error() );
mysqli_select_db("$db_database" , $connect)
    or die( DATABASE_CONNECT_ERROR . mysqli_error() );

function CleanUp($data) {
    $data = trim(htmlentities(strip_tags($data)));
    return $data;
    }

function escape_sql($sql) {
    if (get_magic_quotes_gpc()) $sql = stripslashes($sql);
    return mysqli_real_escape_string($sql);
    }
?>

</div>

Answer 1

First of all you no need to have "" for your DB connection because you pass it as a variable

Second thing is In MYSQLI always Pass $connection with your Connection.

And for a mysqli_error pass $connection to let server know you are looking for error in Database Connection.

Try this.

$connect = mysqli_connect($db_server, $db_user, $db_password)
    or die( DATABASE_CONNECT_ERROR . mysqli_error($connect) );
mysqli_select_db($connect, $db_database)
    or die( DATABASE_CONNECT_ERROR . mysqli_error($connect) );

Edit

either way you can try connect your DB As follow

$connect = mysqli_connect($db_server, $db_user, $db_password, $db_database);

// If no connection than Print error
if (mysqli_connect_errno())
  {
      echo "No Active DB Connection Please check: " . mysqli_connect_error();
  }