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We suggest writing a few extra functions in your zencart admin to place into the /admin/includes/functions/extra_functions/ folder for generating inventory reports.

Here's one of our functions, which simply makes a giant array of how many of each product we've sold in the past week, 2 weeks, 4 kees, 6 weeks, etc. Save this into a file called admin/includes/functions/extra_functions/stats_functions.php

<?php
function getSalesStats()
{
  global $db;
 
 
  $all = array();
  for ($i = 0; $i < 2000; $i++)
    {      $all[$i] = array(0,0,0,0,0,0,0);    }
  $selectql = $db->Execute("SELECT op.products_id, op.products_quantity, o.date_purchased, DATEDIFF(CURDATE(), o.date_purchased) as diff from orders_products op LEFT JOIN orders o on op.orders_id = o.orders_id WHERE DATEDIFF(CURDATE(), o.date_purchased) < 90");
  while(!$selectql->EOF)
    {
      $pid = $selectql->fields['products_id'];
      if($selectql->fields['diff'] <= 7)        {         $all[$pid][0] += $selectql->fields['products_quantity'];      }
      if($selectql->fields['diff'] <= 14)       {         $all[$pid][1] += $selectql->fields['products_quantity'];      }
      if($selectql->fields['diff'] <= 21)       {         $all[$pid][2] += $selectql->fields['products_quantity'];      }
      if($selectql->fields['diff'] <= 28)       {         $all[$pid][3] += $selectql->fields['products_quantity'];      }
      if($selectql->fields['diff'] <= 42)       {         $all[$pid][4] += $selectql->fields['products_quantity'];      }
      if($selectql->fields['diff'] <= 56)       {         $all[$pid][5] += $selectql->fields['products_quantity'];      }
      if($selectql->fields['diff'] <= 90)       {         $all[$pid][6] += $selectql->fields['products_quantity'];      }
      $selectql->MoveNext();
    }
 
  return $all;
 
}
?>

And you will be able to call this function from any new report-generating pages that you create.

Here's an example of a report generating page using this custom created function

inventory_report.php.zip