export data in CSV with Zip. (Its so usefull to download the big size data)

exportCSV_Zip.php

<?php
function exportCSV_Zip($id, $data) {
    $this->load->library('zip'); //load CodeIgniter Zip Library
    $csv_data = '';
    if ($data && count($data[0]) > 0) {
        $rc = 0;
        foreach ($data[0] as $key => $value) {
            if ($rc > 0) {
                $csv_data .= ',';
            } $rc++;
            $csv_data .= "$key";
        }
        $csv_data .= "\r\n";
        foreach ($data as $row):
            $rc = 0;
            foreach ($row as $key => $field_value):
                if ($rc > 0) {
                    $csv_data .= ',';
                } $rc++;
                if (empty($field_value)) {
                    //
                } else if (strlen($field_value) > 10) {
                    $csv_data .= '"' . addslashes($field_value) . '"';
                } else if (is_numeric($field_value)) {
                    $csv_data .= $field_value;
                } else {
                    $csv_data .= '"' . addslashes($field_value) . '"';
                }
            endforeach;
            $csv_data .= "\r\n";
        endforeach;
    } else {
        $csv_data .= "Data Not Found!";
    }
    //data variablise 
    
    //make zip file with data
    $folder_name = "reports_of_$id";
    $name = "report_$id.csv";
    $this->zip->add_data($name, $csv_data);

//        $this->zip->archive(base_url()."csv/$folder_name.zip");   // Write the zip file to a folder on server. Name it "$folder_name.zip"

    $this->zip->download("$folder_name.zip");// Download the file to desktop.
}