PHP timeago函数

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define('TIMEZONE', 'Asia/Shanghai');
date_default_timezone_set(TIMEZONE);

function last_seen($date_time) {
  
    $timestamp = strtotime($date_time);

    $strTime = array("second","minute","hour","day","month","year");
    $length = array("60","60","24","30","12","10");

    $currentTime = time();

    if ($currentTime >= $timestamp) {
      // code...
      $diff = time() - $timestamp;
      for ($i=0; $diff >= $length[$i] && $i < count($length) - 1 ; $i++) { 
        $diff = $diff / $length[$i];
      }

      $diff = round($diff);
      if ($diff < 59 && $strTime[$i] == "second") {
        // code...
        return "Active";
      } else {
        return $diff . " " . $strTime[$i] . "(s) ago";

      }

    }

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