Possible bug in array_diff() php v4.4.0 or at least some odd behavior

[Edward Vermillion <evermillion@xxxxxxxxxxxx>]

I have two arrays:

$faqDataPost:

array
  1 =>
    array
      'faq_order' => '1'
      'faq_question' => 'What is the air speed of a fully laden swallow?'
      'show_question' => '1'
      'faq_answer' => 'African or European?'
  3 =>
    array
      'faq_order' => '2'
      'faq_question' => 'Where is our shrubbery?'
      'show_question' => '1'
      'faq_answer' => 'Nee! Nee!'
  4 =>
    array
      'faq_order' => '3'
      'faq_question' => 'Where is Lancelot?'
      'show_question' => '1'
      'faq_answer' => 'We eat and drink and dance a lot.'


$faqDataDB:

array
  1 =>
    array
      'faq_data_id' => '1'
      'faq_question' => 'What is the air speed of a fully laden swallow?'
      'faq_answer' => 'African or European?'
      'faq_order' => '1'
      'show_question' => '0'
  3 =>
    array
      'faq_data_id' => '3'
      'faq_question' => 'Where is our shrubbery?'
      'faq_answer' => 'Nee! Nee!'
      'faq_order' => '2'
      'show_question' => '0'
  4 =>
    array
      'faq_data_id' => '4'
      'faq_question' => 'Where is Lancelot?'
      'faq_answer' => 'We eat and drink and dance a lot.'
      'faq_order' => '3'
      'show_question' => '0'

/************************************************************/

and this code(sorry the wrap is a bit off):

print'<br />$faqDataPost:<br />';var_dump($faqDataPost);
print'<br />$faqDataDB:<br />';var_dump($faqDataDB);

// Get the changed data...
//
foreach($faqDataPost as $key => $r) {
	
unset($faqDataDB[$key]['faq_data_id']);
$r['show_question'] = isset($r['show_question']) ? $r['show_question'] : 0;
			
print'<br />$r<br />';var_dump($r);
print'<br />DB<br />';var_dump($faqDataDB[$key]);
			
if((string)$r['show_question'] !== 
(string)$faqDataDB[$key]['show_question']) {

print "<br />Does Not Match. Should show up in diff</br />";
}
			
$faqDataInsert[$key] = array_diff($r, $faqDataDB[$key]);
			
print'<br />diff<br/><pre>';print_r($faqDataInsert[$key]);print'</pre>';

}

/************************************************************/

and these results:

$r

array
  'faq_order' => '1'
  'faq_question' => 'What is the air speed of a fully laiden swallow?'
  'show_question' => '1'
  'faq_answer' => 'African or European?'


DB

array
  'faq_question' => 'What is the air speed of a fully laiden swallow?'
  'faq_answer' => 'African or European?'
  'faq_order' => '1'
  'show_question' => '0'


Does Not Match. Should show up in diff

diff

Array
(
)


$r

array
  'faq_order' => '2'
  'faq_question' => 'Where is our shrubbery?'
  'show_question' => '1'
  'faq_answer' => 'Nee! Nee!'


DB

array
  'faq_question' => 'Where is our shrubbery?'
  'faq_answer' => 'Nee! Nee!'
  'faq_order' => '2'
  'show_question' => '0'


Does Not Match. Should show up in diff

diff

Array
(
    [show_question] => 1
)


$r

array
  'faq_order' => '3'
  'faq_question' => 'Where is Lancealot?'
  'show_question' => '1'
  'faq_answer' => 'We eat and drink and dance a lot.'


DB

array
  'faq_question' => 'Where is Lancealot?'
  'faq_answer' => 'We eat and drink and dance a lot.'
  'faq_order' => '3'
  'show_question' => '0'


Does Not Match. Should show up in diff

diff

Array
(
    [show_question] => 1
)

/**************************************************************/

The problem is that in the first loop through the arrays, array_diff() 
doesn't pick up that ['show_question'] is different, although it does 
pick it up in the following loops.

The interesting bit is that arra_diff_assoc() DOES pick up the 
difference in the first loop.

Both arrays are built in foreach() statements and I can't see any 
difference between the first sub array and subsequent sub arrays that 
would cause array_diff() to miss the diference in the first one.

If I change any of the other values in the first sub array, array_diff() 
will pick those up fine, just not the ['show_question'] part.

I'm going to use array_diff_assoc(0 for this right now because it works 
and that what matters, but does anyone know why I'm having this problem 
with array_diff()? Can you see something that I'm missing?

Thanks!

Ed

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