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* @param int $depth Depth of current element.
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* @param array $args An array of arguments.
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* @param string $output Passed by reference. Used to append additional content.
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public function display_element( $element, &$children_elements, $max_depth, $depth, $args, &$output ) {
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$id_field = $this->db_fields['id'];
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$id = $element->$id_field;