旧版本中PHP缺少功能

Question

My this PHP function converts a datetime string into more readable way to represent passed date and time. This is working perfect in PHP version 5.3.0 but on the server side it is PHP version 5.2.17 which lacks this function. Is there a way I can fix this efficiently? This is not only a function which needs this "diff" function but there are many more.

public function ago($dt1)
 {
  $interval = date_create('now')->diff(date_create($dt1));
  $suffix = ($interval->invert ? ' ago' : '-');
  if ($v = $interval->y >= 1) return $this->pluralize($interval->y, 'year') . $suffix;
  if ($v = $interval->m >= 1) return $this->pluralize($interval->m, 'month') . $suffix;
  if ($v = $interval->d >= 1) return $this->pluralize($interval->d, 'day') . $suffix;
  if ($v = $interval->h >= 1) return $this->pluralize($interval->h, 'hour') . $suffix;
  if ($v = $interval->i >= 1) return $this->pluralize($interval->i, 'minute') . $suffix;
   return $this->pluralize($interval->s, 'second') . $suffix;
 } 

Answer 1

I came to this re-written function which works pretty well.

class DateTimeFormatter
{
    private $now;
    public $invert;
    public $y, $m, $d, $h, $i, $s;

    function DateTimeFormatter()
    {
        $this->now = date_parse(date("Y-m-d H:i:s"));   
    }

    function now()
    {
        $this->now = date_parse(date("Y-m-d H:i:s"));
        return $this->now;
    }

    function diff($dt)
    {
        if (!is_array($dt))
            $dt = date_parse($dt);

        if ($this->now() > $dt)
        {
            $this->invert = 1;
            $this->y = $this->now['year'] - $dt['year'];
            $this->m = $this->now['month'] - $dt['month'];
            $this->d = $this->now['day'] - $dt['day'];
            $this->h = $this->now['hour'] - $dt['hour'];
            $this->i = $this->now['minute'] - $dt['minute'];
            $this->s = $this->now['second'] - $dt['second'];
        }
        else
        {
            $this->invert = 0;
            $this->y = $dt['year'] - $this->now['year'];
            $this->m = $dt['month'] - $this->now['month'];
            $this->d = $dt['day'] - $this->now['day'];
            $this->h = $dt['hour'] - $this->now['hour'];
            $this->i = $dt['minute'] - $this->now['minute'];
            $this->s = $dt['second'] - $this->now['second'];
        }

        return $this;                            
    }

    function ago($datetime)
    {
        $interval = $this->diff($datetime);
        $suffix = ($interval->invert ? ' ago' : '');
        if ($v = $interval->y >= 1) return $this->pluralize($interval->y, 'year') . $suffix;
        if ($v = $interval->m >= 1) return $this->pluralize($interval->m, 'month') . $suffix;
        if ($v = $interval->d >= 1) return $this->pluralize($interval->d, 'day') . $suffix;
        if ($v = $interval->h >= 1) return $this->pluralize($interval->h, 'hour') . $suffix;
        if ($v = $interval->i >= 1) return $this->pluralize($interval->i, 'minute') . $suffix;
        return $this->pluralize($interval->s, 'second') . $suffix;
    }

    function pluralize( $count, $text )
    {
        return $count . (($count == 1) ? (" $text") : (" ${text}s"));
    }
}