EDIT

/**

 * Extracts the tagged text for sec references name in source with separator from a tagged text array.

 * @param $tagged_text

 *    The tagged text to operate on

 * @param bool $replace_with_placeholder

 *    Indicates the method to add a empty placeholder tagged text alement as relpacement for the extrated tagged text

 *    elements.

 *

 * @return array

 */

function tagged_text_extract_secReference_name_in_source(&$tagged_text) {

  $extracted_tt = array();

  if (is_array($tagged_text)) {

    $tt_length = count($tagged_text);

    $index = -1;

    for ($i = 0; $i < $tt_length; $i++) {

      if ($i < $tt_length -1 && isset($tagged_text[$i]) && $tagged_text[$i+1]->type == 'name' && $tagged_text[$i]->type == "secNameInSourceSeparator") {

        $extracted_tt[++$index] = $tagged_text[$i];

        $extracted_tt[++$index] = $tagged_text[$i + 1];

        unset($tagged_text[$i]);

        unset($tagged_text[$i + 1]);

        continue;

        //search for all elements with type secNameInSource and the last separator

      }

      if (isset($tagged_text[$i]) && $tagged_text[$i]->type == 'secNameInSourceSeparator') {

        $extracted_tt[++$index] = $tagged_text[$i];

        unset($tagged_text[$i]);

        break;

        //search for all elements with type secNameInSource and the last separator

      }

      if(isset($tagged_text[$i])  && $index >0){

          $extracted_tt[++$index] = $tagged_text[$i];

          unset($tagged_text[$i]);

      }

    }

  }

  $tagged_text = array_values($tagged_text); // re-index array to make it continuous again

  return $extracted_tt;

}