You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '.ru' at line 1?

define("NEWDB" , "site.ru");
    $dbcnx = mysqli_connect($DBhost,$DBuser,$DBpass);
    $createDB = "CREATE DATABASE ".NEWDB;
    if (mysqli_query($dbcnx, $createDB)) {
        echo "Database ".NEWDB." created successfully<br>";
    } else {
        echo "Error creating database: " . mysqli_error($dbcnx).'<br>';
    }