[Resolved] Please explain this class inheritance

[ppowell]

I'm having a serious problem in my application I simply cannot seem to fix, and it has to do with multiple inheritances whereby something is lost.

Class EditView is a child of PagOptionsView
Class Addview is a child of AssocView

EditView's constructor will call a "super()" onto PagOptionsView as so:

parent::PagOptionsView($id, $errorArray);

EditView's constructor will next instantiate an AddView object for itself:

$this->addView =& new AddView($this->id, $this->errorArray);

AddView's constructor will call a "super()" onto AssocView as so:

parent::AssocView($id, $errorArray);

PagOptionsView's constructor instantiates a DBActionPerformer object as so:

$this->dbAP = new DBActionPerformer($id);

AssocView's constructor instantiates a DBActionPerformer object as so:

$this->dbAP =& new DBActionPerformer($id);

DBActionPerformer's constructor instantiates a DBConnection object as so:

$this->dbConnObj = new DBConnection($dbHost, $dbPort, $dbUser, $dbPwd, $dbDefaultName);

Now, when I instantiate an EditView object, I have a method, displayHTML() that will display HTML of stuff. I can do this and everything works beautifully:

$result = $this->dbAP->select(); // RESULTSET EVERY TIME 

However, were I do this, again, in EditView's displayHTML() method:

$html .= $this->addView->displayHTML(); 

I get the following error:

[Quote]...function on a non-object in ...[/Quote]

This occurs because the following doesn't exist as an object:

[Quote]$this->addView->dbAP->dbConnObj[/Quote]

Whereas this exists:

[Quote]$this->dbAP->dbConnObj[/Quote]

What is going on?  The DBConnection object is somehow nonexistent in one method of inheritance but found in another.  I need someone who really REALLY knows their OO PHP (or can fake it good enough) to help me with this one, I'm totally stuck!

Thanx
Phil

[ppowell]

I GOT IT!!

using class DBActionPerformer:

class DBActionPerformer extends MethodGeneratorForActionPerformer {

function DBActionPerformer($id, $errorArray) {
 global $dbHost, $dbPort, $dbUser, $dbPwd, $dbDefaultName;
 $this->id = $id;
 if (is_array($errorArray)) $this->errorArray = $errorArray;
 $this->dbConnObj =& new DBConnection( $dbHost, $dbPort, $dbUser, $dbPwd, $dbDefaultName);
}

function &connect() {
 $this->dbConn = $this->dbConnObj->connect();
}

// HERE WAS THE CULPRIT!!
/**
 * Disconnect from database
 *
 * @access public
 */
function &disconnect() {							// STATIC VOID METHOD
	if ($this->dbConn) $this->dbConnObj->close();
            // THIS CAUSED THE FATAL ERROR:  $this->dbConnObj = null;
	$this->dbConn = null;
}

  }

Apparently what was happening the whole time was that I needed a persistent DB connection, however, I would have methods whereby disconnections would take place and instead of freeing the resource but keeping the object alive, the resources would be freed AND the object destroyed. Thus, reconnection, whenever warranted, would be impossible, simply because I was performing the connect() method on a... non-object!

I also decided to allow for an option to keep persistent DB connections (not allowing even for a disconnect() method to be called) in certain methods so that the connection stays open as long as it needs to stay open until you're done with the DB.

Phil