Whats use of following code in lovefactory extension joomla?

Question

$newMembership = JTable::getInstance('MembershipSold', 'Table');
$newMembership->load($this->membership_sold_id);
$this->membership_sold = $newMembership;
$dispatcher->trigger('onAfterMembershipChanged', array($newMembership));
return parent::store();/* whats the use of above code */

Answer 1

1. $newMembership = JTable::getInstance('MembershipSold', 'Table');
   This line is getting is a static method to get an instance of a JTable class, specifically one called "MembershipSold". You can read about JTable (Joomla's abstract table class) here, the document is a little out of date but you can read the relevant JTable class in your Joomla installation at /libraries/joomla/database/table.php

2. $newMembership->load($this->membership_sold_id);
   This line uses the membership_sold_id to load a record from the table in the database.

3. $this->membership_sold = $newMembership;
   This line inserts the JTable object (now holding the record loaded from the table) into the $this.

4. $dispatcher->trigger('onAfterMembershipChanged', array($newMembership));
   This line appears to be triggering an event and passing in the $newMembership object (Joomla supports a basic event system for plugins etc to act on), you can read more about it in this document "Supporting plugins in your component"

5. return parent::store();
   This line is calling the current objects parent's store() method. See PHP:parent