PHP to mySQL Connect to DB

Alright, I am at a very beginner stage of learning PHP and have attempted to find the solution to this problem on my own; but with no luck. So any advice is appreciated.

I have a website that is hosted on Bluehost and have setup a database with tables on the same host, same account. I can login to this database through phpMyAdmin, and did so to setup the tables. So I know my username/password is correct.

The script on my web page is this:

PHP Code:

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<?php include 'header.php';

$username ="anaddmin_rmd";
$password = "DidThis65?";
$host = "localhost";
$conn = new mysqli($host, $username, $password);

if (!$conn)
  {
  die('Could Not Connect to Server: ' . mysql_error());
  }

mysql_select_db ("anaddmin_stpsormd") or die ("Could Not Connect to Database:" . mysql_error());

$sql="INSERT INTO options (options_make, options_model, options_ecp, options_bootapp, options_burnapp, options_mcu, options_ch721)
VALUES ('$_POST[make]','$_POST[model]','$_POST[ecp]','$_POST[bootapp]','$_POST[burnapp]','$_POST[mcu]','$_POST[ch721]',)";

if (!mysql_query($sql,$conn))
{
die ('Error: ' . mysql_error());
}
echo "Record added";

?>

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Username and Password were altered for security but the format is exactly the same as above, in case it's part of the problem.

So anyway, I have an HTML form on the page with a few text-boxes and when I fill them out and click 'submit', I get this error:

Quote:

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Could Not Connect to Database:Access denied for user 'root'@'localhost' (using password: NO)

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On a seperate occassion I have verified that the server connects just fine. I only receive an error when attempting to select the database (name has not been altered).

Any ideas? I'd really appreciate it...

I should add that I have created/verified the user specified within the connect code is assigned to the database. I use this same account to access it via phpMyAdmin.

I'm not sure where this root@localhost is coming from since I'm not trying to connect as root.

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Also, should

PHP Code:

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mysql_select_db ("anaddmin_stpsormd") or die ("Could Not Connect to Database:" . mysql_error()); 


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really be

PHP Code:

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mysql_select_db ('anaddmin_stpsormd') or die ('Could Not Connect to Database:' . mysql_error()); 


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? I need to learn more about when to use double and single quotes in PHP.

PHP Code:

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<?php
include 'header.php';
$user ="anatar_bgg";
$pass = "RatDag52?";
try {
    $dbh = new PDO('mysql:host=localhost;dbname=ansdain_tsdffd', $user, $pass);
    //Connect to Database.
    $dbh->exec("SET CHARACTER SET utf8");
    //Set Character Code to UTF8.
        
    $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    
    //Catch Connection Errors.
    $make = $_POST["make"];
    $model = $_POST["model"];
    $ecp = $_POST["ecp"];
    $bootapp = $_POST["bootapp"];
    $burnapp = $_POST["burnapp"];
    $mcu = $_POST["mcu"];
    $ch721 = $_POST["ch721"];
    //Establish Variables Submitted by Form.
    $dbh->beginTransaction();
    $dbh->exec("INSERT INTO options (options_make, options_model, options_ecp, options_bootapp, options_burnapp, options_mcu, options_ch721) 
    VALUES ('" . $make . "','" . $model . "','" . $ecp . "','" . $bootapp . "','" . $burnapp . "','" . $mcu . "','" . $ch721 . "')");
    $dbh->commit();
    //Insert Variables into Database.
} 
    
catch (Exception $e) {
$dbh->rollBack();
echo "Failed: " . $e->getMessage();}

$dbh = null;

?>

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Works