Remove unnecessary columns from CSV

if($maxProd && !empty($productFields)) {
    $first = array();
    $o = reset($this->orders);
    foreach($o as $key => $val) {
      if(is_array($val))
        continue;
      $first[] = $key;
    }
    $o = null;
    for($i=1;$i<=$maxProd;$i++){
      foreach($productFields as $field){
        $first[] = 'item'.$i.'_'.$field;
      }
    }
  } else {
    $first = array_keys(get_object_vars(reset($this->orders)));
  }
  $export->writeLine($first);

if(!empty($this->orders)){
  $maxProd = 0;
  $productFields = null;
  foreach($this->orders as $order){
    $nbProd = count($order->products);
    if($maxProd < $nbProd){
      $maxProd = $nbProd;
      if(empty($productFields)){
        $productFields = array_keys(get_object_vars(reset($order->products)));
      }
    }
  }

  if($maxProd && !empty($productFields)) {
    $first = array();
    $o = reset($this->orders);
    foreach($o as $key => $val) {
      if(is_array($val))
        continue;

if(in_array($key,array('order_number','user_created','user_email')))  
$first[] = $key;

    }
    $o = null;
    for($i=1;$i<=$maxProd;$i++){
      foreach($productFields as $field){
        $first[] = 'item'.$i.'_'.$field;
      }
    }
  } else {
    $first = array_keys(get_object_vars(reset($this->orders)));
  }
  $export->writeLine($first);

  foreach($this->orders as $row){
    if(!empty($row->user_created)) $row->user_created = hikashop_getDate($row->user_created,'%Y-%m-%d %H:%M:%S');
    if(!empty($row->order_created)) $row->order_created = hikashop_getDate($row->order_created,'%Y-%m-%d %H:%M:%S');
    if(!empty($row->order_modified)) $row->order_modified = hikashop_getDate($row->order_modified,'%Y-%m-%d %H:%M:%S');

$new_row = array();
foreach ($row as $key => $value)  {
if(in_array($key,array('order_number','user_created','user_email')))  
$new_row[$key] = $value;

}

    if($maxProd && !empty($productFields)){
      for($i=1;$i<=$maxProd;$i++){
        $prod =& $row->products[$i-1];
        foreach($productFields as $field){
          $n = 'item_'.$i.'_'.$field;
          $row->$n = @$prod->$field;
        }
      }
    }

    $export->writeLine($new_row);
  }
}

<?php
/**
 * @package	HikaShop for Joomla!
 * @version	2.3.2
 * @author	hikashop.com
 * @copyright	(C) 2010-2014 HIKARI SOFTWARE. All rights reserved.
 * @license	GNU/GPLv3 http://www.gnu.org/licenses/gpl-3.0.html
 */
defined('_JEXEC') or die('Restricted access');
?><?php
while(ob_get_level() > 1)
	ob_end_clean();

$config =& hikashop_config();
$format = $config->get('export_format','csv');
$separator = $config->get('csv_separator',';');
$force_quote = $config->get('csv_force_quote',1);

$export = hikashop_get('helper.spreadsheet');
$export->init($format, 'hikashop_export', $separator, $force_quote);

if(!empty($this->orders)){
	$maxProd = 0;
	$productFields = null;
	foreach($this->orders as $order){
		$nbProd = count($order->products);
		if($maxProd < $nbProd){
			$maxProd = $nbProd;
			if(empty($productFields)){
              $productFields = array('order_product_code','order_product_quantity');
			}
		}
	}

	if($maxProd && !empty($productFields)) {
		$first = array();
		$o = reset($this->orders);
		foreach($o as $key => $val) {
			if(is_array($val))
				continue;
          if(in_array($key,array('order_number','user_created','user_email','order_status','order_payment_method','order_full_price','order_discount_price','shipping_address_title','shipping_address_firstname','shipping_address_lastname','shipping_address_street','shipping_address_street2','shipping_address_post_code','shipping_address_post_code','shipping_address_city','shipping_address_telephone','shipping_address_state','shipping_address_country' )))  
        $first[] = $key;
		}
		$o = null;
		for($i=1;$i<=$maxProd;$i++){
			foreach($productFields as $field){
                  if(in_array($field,array('order_product_code','order_product_quantity'))) 
                    $first[] = 'item'.$i.'_'.$field;
			}
		}
	} else {
		$first = array_keys(get_object_vars(reset($this->orders)));
	}
	$export->writeLine($first);

	foreach($this->orders as $row){
		if(!empty($row->user_created)) $row->user_created = hikashop_getDate($row->user_created,'%Y-%m-%d %H:%M:%S');
		if(!empty($row->order_created)) $row->order_created = hikashop_getDate($row->order_created,'%Y-%m-%d %H:%M:%S');
		if(!empty($row->order_modified)) $row->order_modified = hikashop_getDate($row->order_modified,'%Y-%m-%d %H:%M:%S');
      
      $new_row = array();
foreach ($row as $key => $value)  {
if(in_array($key,array('order_number','user_created','user_email','order_status','order_payment_method','order_full_price','order_discount_price','shipping_address_title','shipping_address_firstname','shipping_address_lastname','shipping_address_street','shipping_address_street2','shipping_address_post_code','shipping_address_post_code','shipping_address_city','shipping_address_telephone','shipping_address_state','shipping_address_country' )))  
$new_row[$key] = $value;

}
   
      
		if($maxProd && !empty($productFields)){
			for($i=1;$i<=$maxProd;$i++){
				$prod =& $row->products[$i-1];
				foreach($productFields as $field){
					$n = 'item_'.$i.'_'.$field;
					$new_row[$n] = @$prod->$field;
				}
			}
		}
$export->writeLine($new_row);
	}
}

$export->send();
exit;