Clone publish layouts

clone.php

<?php
$field_display = array(
                    'visible'       => TRUE,
                    'collapse'      => FALSE, 
                    'html_buttons'  => TRUE,
                    'is_hidden'     => FALSE,
                    'width'         => '100%'
                );
                
                $data = array(
                    'member_group'  => $group_id, 
                    'channel_id'    => $row->channel_id
                );
                
                $qry = $this->EE->db->get_where('layout_publish', $data);

                $insert = array_merge($data, array(
                    'field_layout'  => $qry->row('field_layout'),
                    'site_id'       => $qry->row('site_id'),
                    'channel_id'    => $channel_id
                ));
                
                // See if it's a Structure listing channel first.
                if(array_key_exists('structure', $this->EE->addons->get_installed()))
                {
                    $settings = $this->get_structure_settings();
                    $channel_data = $settings[$channel_id];
                    
                    // If it's unmanaged or a listing, we need to clean up the field_layout.
                    if($channel_data['type'] != 'page')
                    {
                        $field_layout = unserialize($insert['field_layout']);
                        
                        // Remove Structure tab entirely
                        if($channel_data['type'] == 'unmanaged')
                        {
                            unset($field_layout['structure']);
                        }
                        // Just remove a few of fields
                        elseif($channel_data['type'] == 'listing')
                        {
                            unset($field_layout['structure']['structure__listing_channel']);
                            unset($field_layout['structure']['structure__parent_id']);
                            unset($field_layout['structure']['structure__hidden']);
                        }
                        
                        $insert['field_layout'] = serialize($field_layout);
                    }
                }
                
                // Going to do a few channel specific things here so the publish layouts
                // don't blow up and throw a bunch of PHP errors.
                
                // Get channel settings
                $qry = $this->EE->db->get_where('channels', array('channel_id' => $channel_id));
                
                $field_layout = unserialize($insert['field_layout']);
                
                // See if Revisions are enabled for the channel, if not, make sure it's not a set tab
                if($qry->row('enable_versioning') == 'n')
                {
                    unset($field_layout['revisions']);
                }
                
                // Remove the comment exp date field if it's in the layout and commenting is off
                if($qry->row('comment_system_enabled') == 'n')
                {
                    unset($field_layout['date']['comment_expiration_date']);
                }
                // If commenting is on, give the field the default display
                else
                {
                    $field_layout['date']['comment_expiration_date'] = $field_display;
                }
                
                $insert['field_layout'] = serialize($field_layout);
                
                $this->EE->db->insert('layout_publish', $insert);