error on mysqli multiple connection via class - php

Question

i have the following problem which costs me the last couple of hours...
i have a class for mysqli connections:
class database extends SplObjectStorage{
private $db_link;
public function __construct($MySQLi_DB){
if(!file_exists($_SERVER["HOME"].'/'.(substr($_SERVER['PHP_SELF'], 1, strpos(substr($_SERVER['PHP_SELF'], 1),'/'))).'/includes/mysqli.inc.php')){
echo "MySQLi Include Datei nicht vorhanden";
}else{
if (!$this->create_connection($MySQLi_DB) == true){
echo "Error creating Database. Parameter '".$MySQLi_DB."' unknown<br><br>";
}
}
}
public function query($query){
Return $this->db_link->query($query);
}
public function close(){
mysqli_close($this->db_link);
}
private function create_connection($MySQLi_DB){
include_once($_SERVER["HOME"].'/'.(substr($_SERVER['PHP_SELF'], 1, strpos(substr($_SERVER['PHP_SELF'], 1),'/'))).'/includes/mysqli.inc.php');
$this->db_link = new mysqli($MySQLi_Host, $MySQLi_User, $MySQLi_Passw, $MySQLi_Praefix.$MySQLi_DB);
$this->attach($this->db_link);
if ($mysqli->connect_errno) {
echo "Failed to connect to MySQLi: (" . $mysqli->connect_errno . ") " . $mysqli->connect_error;
return false;
}else{
return true;
}
echo $mysqli->host_info . "\n";
}
The constructor initializes the class by looking for an include-file which contains all connectiondata like user, pwd, etc.
it although receive a parameter ($MySQLi_DB) which is similar to the databasename.
When i call this class with this command:
$SSO_DB = new database('SSO');
This class works fine.
Changing the parameter do another databasename is no problem.
e.g.: $Social_DB = new database('social');
This is even no problem until i call two instanzes of my class on the same page!
e.g.:
$SSO_DB = new database('SSO');
$Social_DB = new database('social');
Returns this error:
Warning: mysqli::mysqli(): (HY000/1044): Access denied for user ''#'localhost' to database 'social' in /volume1/web/portal/classes/database.class.php on line 41
Line 41 is:
$this->db_link = new mysqli($MySQLi_Host, $MySQLi_User, $MySQLi_Passw, $MySQLi_Praefix.$MySQLi_DB);
When i remove one of the classcalls no error.
No matter which call i remove...
Any idea?

Answer 1

changing include_once() into include() solved the problem! php seems to store how often the class is called on one page and did not included the file a second time.