Returns response for export in CSV format for laravel

routes.php

<?php

/**
 * Returns response in CSV format
 *
 * Call this class from Controller as below
 * return Response::csv($data, $filename);
 */
Response::macro('csv', function($data, $filename = 'data.csv', $status = 200, $delimiter = ",", $linebreak = "\n", $headers = array())
{ 
    return Response::stream(function() use ($data, $delimiter, $linebreak) {
        foreach ($data as $row) {
            $keys = array(); $values = array();
            $i = (isset($i)) ? $i+1 : 0;
            foreach ($row->toArray() as $k => $v) {
                if ($i==0) $keys[] = $k;
                $values[] = is_numeric($v) ? $v : '"' . str_replace('"', '""', $v) . '"';
            }
            if (count($keys) > 0) echo implode($delimiter,$keys) . $linebreak;
            if (count($values) > 0) echo implode($delimiter,$values) . $linebreak;
        }
    }, $status, array_merge(array(
        'Content-type' => 'application/csv',
        'Cache-Control' => 'must-revalidate, post-check=0, pre-check=0',
        'Content-Description' => 'File Transfer',
        'Content-type' => 'text/csv',
        'Content-Disposition' => 'attachment; filename=' . $filename,
        'Expires' => '0',
        'Pragma' => 'public',
    ), $headers));
});