/home/edulekha/crm.edulekha.com/application/views/admin/invoices/filter_params.php
<?php defined('BASEPATH') or exit('No direct script access allowed'); ?>
<div class="_filters _hidden_inputs">
    <?php
    foreach ($invoices_sale_agents as $agent) {
        echo form_hidden('sale_agent_' . $agent['sale_agent']);
    }

foreach ($invoices_statuses as $_status) {
    $val = '';
    if ($_status == $this->input->get('status')) {
        $val = $_status;
    }
    echo form_hidden('invoices_' . $_status, $val);
}

foreach ($invoices_years as $year) {
    echo form_hidden('year_' . $year['year'], $year['year']);
}

foreach ($payment_modes as $mode) {
    echo form_hidden('invoice_payments_by_' . $mode['id']);
}
echo form_hidden('not_sent', $this->input->get('filter'));
echo form_hidden('not_have_payment');
echo form_hidden('recurring');
echo form_hidden('project_id');
?>
</div>