function to get time difference
function get_days($row)
{
$diff = strtotime($row['duedate']) - strtotime(date('Y-m-d'));
$diff_days = floor($diff/(60*60*24));
$html = abs($diff_days)<10000 ? '<td>'.$diff_days.'</td>' : '<td> </td>';
return $html;
}
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