mysql - Call to a member function query() on a non-object in PHP -


I have a little problem converting from mysql to mysqli, this error has been displayed in: Member Function on a non-object Call query ()

here is config.php: 

  $ db = new mysqli ($ dbhost, $ dbuser, $ dbpass, $ dbname); If ($ db-> Connect_error) {trigger_error ('error:'. $ Db-> Connect_uper, E_USER_ERROR); }   
 And here is the function in statistics.php:  
  public function getTotalServerCount () {$ sql = 'SELECT * control from paneel.server'; $ Total = $ db- & gt; Query ($ sql); Counterpart $ total; }   
 Please note that this function is contained in class in the name of statistics.  
 I understand that the original code was done in a procedural way and I am trying to convert it to an object oriented way, but I have not yet found any solution.   
 
 
 <<>> $ db  is the property of the class that can < / p> 
  $ total = $ this-  $ db  This function is undetermined in scope, & gt; Db- & gt; Query ($ SQL); You can optionally pass it as a parameter:  
  public function getTotalServerCount ($ db) {// ... < / Code>

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