Just noticed I failed to include the expected results for the above
form. If you select Option 4 with the original code the form validation
will fail even though it's a valid option. The suggested fix will
validate the form successfully.

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https://bugs.launchpad.net/bugs/1497341

Title:
  Pieforms "select" rule validation with optgroups fails

Status in Mahara:
  In Progress
Status in Mahara 1.10 series:
  New
Status in Mahara 1.9 series:
  New
Status in Mahara 15.04 series:
  New

Bug description:
  The validation for pieform select elements fails in some cases when
  optgroups are used. Mahara 15.04.3 used but this will affect previous
  versions going back to the introduction of optgroup support.

  I think this may only affect optgroups that have an integer as the
  key. Example optgroup array to reproduce the issue:

  
  $optgroup = array(
      array("label" => "Test Group 1", "options" => array(
          1 => "Option 1",
          2 => "Option 2"
      )),
      array("label" => "Test Group 2", "options" => array(
          3 => "Option 3",
          4 => "Option 4"
      ))
  );

  $elements['example_optgroup_select'] = array(
      'type' => 'select',
      'description' => "Choose an option",
      'optgroups' => $optgroup,
      'title' => "Example optgroup select",
      'rules' => array()
  );

  
  Selecting "Option 4" will cause the validation to throw an error: The option 
"4" is invalid.

  The issues appears to be in the "pieform_element_select_get_options"
  function in htdocs/lib/pieforms/pieform/elements/select.php

  Specifically:

  foreach ($element['optgroups'] as $optgroup) {
     $options = array_merge($options, $optgroup['options']);
  }

  To retain the array key required for validation I believe this should
  be:

  foreach ($element['optgroups'] as $optgroup) {
     $options = $options + $optgroup['options'];
  }

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