CSV Export

$file_name = 'anything';
$rel_path = 'uploads/' . str_slug($file_name) . '.csv';
$full_path = public_path($rel_path);
$f = fopen($full_path, 'w');

$firstLineKeys = false;

Model::select('data', 'data2')->chunk(500, function($entries) use ($f, $firstLineKeys) {
    $array = json_decode(json_encode($entries), true);

    foreach ($array as $line) {
        if (empty($firstLineKeys)) {
            $firstLineKeys = array_keys($line);
            fputcsv($f, $firstLineKeys);
            $firstLineKeys = array_flip($firstLineKeys);
        }
        fputcsv($f, $line);

    }
});

return Redirect::to('/' . $rel_path);