str_putcsv for php

str_putcsv.php

<?php

/* From: http://www.php.net/manual/en/function.str-getcsv.php#88773 and http://www.php.net/manual/en/function.str-getcsv.php#91170 */

if(!function_exists('str_putcsv'))
{
  function str_putcsv($input, $delimiter = ',', $enclosure = '"')
  {
    $csv = fopen('php://temp','r+');

    fputcsv($csv, $input);

    rewind($csv);

    $output = stream_get_contents($csv);

    fclose($csv);

    return $output;
  }
}

What are your thoughts about the original version that has $data = fgets($fp); instead of $output = stream_get_contents($csv);? And any idea why it got -1 points while it seems to work well?