使用implode下载csv Laravel 4的前导零

When I download the csv:

54 is displayed instead of 00054. I'm using the next code:

    $table = PldUsuario::all();
    $output='';
    foreach ($table as $row) {
        $output.=  implode(",",$row->toArray());
        $output.= "
";
    }
    $headers = array(
        'Content-Type' => 'text/csv',
        'Content-Disposition' => 'attachment; filename="UsersPld.csv"',
    );
    return Response::make(rtrim($output, "
"), 200, $headers);

In my table in mysql displayed 00054.

To get excel to not remove the leading zeros, first make sure that they are a string in your initial array, then when setting them as the field in the CSV, it should read ,="00054". You'd probably need to go through your $row->toArray() prior to imploding it to make those fields be "=\"00054\"" first.