Can I instantiate a PHP class inside another class? -

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I was wondering if he was allowed to make an example of a class inside another class.

, would I have to make it out and then have to pass it through the constructor?

Example (a database class): 

  class something {if (.....) {Include SITE_ROOT 'application /' 'db.class.php '; $ Db = new db

You can not define a square in another class. You should include files with other classes outside the classroom In your case, it will give you two top-level class db and some . You can now create an example of db in the manufacturer of some . For example: 

  included SITE_ROOT 'application /' 'db.class.php'; Class some {public function __ composition () {if (...) {$ this-> Db = new db; }}}

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