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MySql Error Message for Host, Database, Username and Password.

Hello.

I've read the entire book (Learning PHP, MySQL & JavaScript, 4th Edition) and reread several chapters I didn't completely understand. Right now, I'm attempting to build a sample social network right now.

Here's an error that's been troubling me for a day or two. I'll probably reread a few sections in the book to figure it out myself later on.

Warning: mysqli::mysqli(): (HY000/1045): Access denied for user 'commune'@'localhost' (using password: YES) in /Applications/XAMPP/xamppfiles/htdocs/dev/functions.php on line 8
Access denied for user 'commune'@'localhost' (using password: YES)

Here's the code for the "functions.php".

connect_error) die($connection->connect_error);

function createTable($name, $query)
{
queryMysql("CREATE TABLE IF NOT EXIST $name($query)");
echo "Table '$name' created or already exists.
";
}

function queryMysql($query)
{
global $connection;
$result = $connection->query($query);
if (!$result) die($connection->error);
return $result;
}

function destroySession()
{
$_SESSION=array();

if (session_id() != "" || isset($_COOKIE[session_name()]))
setcookie(session_name(), '', time()-2592000, '/');

session_destroy();
}

function sanitizeString($var)
{
global $connection;
$var = strip_tags($var);
$var = htmlentities($var);
$var = stripslashes($var);
return $connection->real_escape_string($var);
}

?>

This is pretty much the exact same code from the book. Eventually when I get better I'll write my code.

So what is the problem here? Thank You
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