秒数转天时分秒

/**
 * PHP 格式化秒
 */
 
function vtime($time) {
  $output = '';
  foreach (array(86400 => '天', 3600 => '小时', 60 => '分', 1 => '秒') as $key => $value) {
        if ($time >= $key) $output .= floor($time/$key) . $value;
        $time %= $key;
  }
  return $output;
}