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Php class loading performance and using extensions,

I have an includes.php page that I load at the top of every page of my website. When I design a website, the number of classes I use is growing. So I get something like this:

$db = new DB($config);
$login = new Login($db, $config);
$form = new Form($db, $config);

And the list goes on and on. I have two questions about this practice:

Firstly, given that I cannot use a class on a specific page (I may not have a $ form on every single page), how important is it to deal with loading this class every time any given page is loaded?

Secondly, you may have noticed that I am passing an instance of the $ db class to all other classes, as well as the $ config variable. In the php code of each class, I am doing something like this:

public $db;
public $config;

public function __construct($db, $config, $smarty){
    $this->db = $db;
    $this->config = $config;
}

'this' :

public function myfunction(){
  $this->db;
  $this->config;
}

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+5
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 require_once("includes/php/class." . $class_name . ".php");
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+1

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