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Filename : csv_helper.php
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<?php

if (!defined('BASEPATH'))
    exit('No direct script access allowed');
if (!function_exists('array_to_csv')) {

    function array_to_csv($array, $download = "") {
        if ($download != "") {
            header('Content-Type: application/csv');
            header('Content-Disposition: attachement; filename="' . $download . '"');
        }
        ob_start();
        $f = fopen('php://output', 'w') or show_error("Can't open php://output");
        $n = 0;
        foreach ($array as $line) {
            $n++;
            if (!fputcsv($f, $line)) {
                show_error("Can't write line $n: $line");
            }
        }
        fclose($f) or show_error("Can't close php://output");
        $str = ob_get_contents();
        ob_end_clean();
        if ($download == "") {
            return $str;
        } else {
            echo $str;
        }
    }

}

if (!function_exists('query_to_csv')) {

    function query_to_csv($query, $headers = TRUE, $download = "") {
        if (!is_object($query) OR ! method_exists($query, 'list_fields')) {
            show_error('invalid query');
        }
        $array = array();
        if ($headers) {
            $line = array();
            foreach ($query->list_fields() as $name) {
                $line[] = $name;
            }
            $array[] = $line;
        }
        foreach ($query->result_array() as $row) {
            $line = array();
            foreach ($row as $item) {
                $line[] = $item;
            }
            $array[] = $line;
        }
        echo array_to_csv($array, $download);
    }

}