pre_save()?

[dwh]

Sorry to bug you, but if you can elaborate it would be most helpful. I can't understand lines like

PHP Code:

pre_save($doquery = true) 


It was called as pre_save() so what is the value of $doquery?

PHP Code:

 if ($this->presave_called !== null)
{
return $this->presave_called;
}
if (!parent::pre_save($doquery))
{
$this->presave_called = false;
return false;
}
if (!$this->pre_save_post($doquery))
{
$this->presave_called = false;
return false;
} 


Totally lost on this?

PHP Code:

 if (!$this->condition)
{
$this->set('lastpost', $this->fetch_field('dateline'));
$this->set('lastposter', $this->fetch_field('username', 'post'));
$this->set('replycount', 0);
$this->set('hiddencount', 0);
} 


dateline? username? post? Where are they getting all this from?

PHP Code:

 if (!$this->condition AND $this->fetch_field('open') === null)
{ 


fetch_field? From where? The database? The existing arrays?


No clue in the slightest what's going on here.