Codeigniter time ago function

  function time_ago($ptime) {
    $today = time();
    $createdday = mysql_to_unix($ptime);
    $datediff = abs($today - $createdday);
    $difftext = "";
    $years = floor($datediff / (365 * 60 * 60 * 24));
    $months = floor(($datediff - $years * 365 * 60 * 60 * 24) / (30 * 60 * 60 * 24));
    $days = floor(($datediff - $years * 365 * 60 * 60 * 24 - $months * 30 * 60 * 60 * 24) / (60 * 60 * 24));
    $hours = floor($datediff / 3600);
    $minutes = floor($datediff / 60);
    $seconds = floor($datediff);
    //year checker
    if ($difftext == "") {
      if ($years > 1)
      $difftext = $years . " years ago";
      elseif ($years == 1)
      $difftext = $years . " year ago";
    }
    //month checker
    if ($difftext == "") {
      if ($months > 1)
      $difftext = $months . " months ago";
      elseif ($months == 1)
      $difftext = $months . " month ago";
    }
    //month checker
    if ($difftext == "") {
      if ($days > 1)
      $difftext = $days . " days ago";
      elseif ($days == 1)
      $difftext = $days . " day ago";
    }
    //hour checker
    if ($difftext == "") {
      if ($hours > 1)
      $difftext = $hours . " hours ago";
      elseif ($hours == 1)
      $difftext = $hours . " hour ago";
    }
    //minutes checker
    if ($difftext == "") {
      if ($minutes > 1)
      $difftext = $minutes . " minutes ago";
      elseif ($minutes == 1)
      $difftext = $minutes . " minute ago";
    }
    //seconds checker
    if ($difftext == "") {
      if ($seconds > 1)
      $difftext = $seconds . " seconds ago";
      elseif ($seconds == 1)
      $difftext = $seconds . " second ago";
    }
    return $difftext;
  }