PHP Call to a member function on a non-object - Help!

[jsdd3]

Hi There,

I have come across a very frustrating issue, which I see is quite a popular one. The following bit of code saves information to an XML file, but since upgrading to PHP 5.2.0 I get the following error:

Call to a member function on a non-object

It is very difficult for us (virtually impossible) to downgrade our version of PHP both from an infrastructural point of view, and also we need to ensure we have the latest version.

I would really appreciate it if anyone could be of assistance in helping me change the code below. The two critical lines in each are:

$this->questions[$idx]->setQuestionText($questionField);
$this->questions[$question_index_id]->fields[$field_index_id]->setHint($hint);

Code snippet:

function getContdevEditorOutput($challenge_id=0,$tutorial_id=0) {
                   $this->challenge_id = $challenge_id;
                   $this->tutorial_id = $tutorial_id;
                   //error_reporting(E_ALL);
                   $form = (isset($_POST['formvars']) ? $_POST['formvars'] : array());
                  
                   // check if form was submitted - all returned
                   if(isset($form['nodeEditForm']) && $form['elementToEdit']=="allfields") {
                             // save question text                             
                             $questionTextFields = $form['saveQText'];
echo "QUESTIONS:<br><br>";
print_r($this->questions);
                             foreach($questionTextFields as $idx=>$questionField)
                             {
                                      $this->questions[$idx]->setQuestionText($questionField);                                      
 
                             }
                            
                            
                             // save hints
                             $hints = $form['saveHint'];
                             foreach($hints as $idx=>$hint) {
                                      $refArr = explode("_",$idx);
                                      $question_index_id = $refArr[0];
                                      $field_index_id = $refArr[1];
                                     
                                      $this->questions[$question_index_id]->fields[$field_index_id]->setHint($hint);
                                                                            
                             }
                            
                             // option texts
                            
                             $options = $form['saveOptionText'];
                             foreach($options as $idx=>$option) {
                                      $refArr = explode("_",$idx);
                                      $question_index_id = $refArr[0];
                                      $field_index_id = $refArr[1];
                                      $option_index_id = $refArr[2];
                                     
                                      if(!isset($questions[$question_index_id]))
                                      $this->questions[$question_index_id]->fields[$field_index_id]->options[$option_index_id]->setLabel($option);
                                                                                                                  
                                      //print "<br/>IDX:".$idx;
                                      //print_r($option);
                             }

Regards,
James Dey