php実装は過去どのくらいの時間で時間を表示しますか?

この例では、phpが過去どのくらいの時間で時間を表示する方法について説明する.皆さんの参考にしてください.具体的には以下の通りです.
ここでは、距離が今10秒、距離が今1日など、読み取り可能な方法でどのくらい経ったかを示します.

function time_is_older_than($t, $check_time){
  $t = strtolower($t);
  $time_type = substr(preg_replace('/[^a-z]/', '', $t), 0, 1);
  $val = intval(preg_replace('/[^0-9]/', '', $t));
  $ts = 0;
  // (s)econds, (m)inutes, (d)ays, (y)ears
  if ($time_type == 's'){ $ts = $val; }
  else if ($time_type == 'm'){ $ts = $val * 60; }
  else if ($time_type == 'h'){ $ts = $val * 60 * 60; }
  else if ($time_type == 'd'){ $ts = $val * 60 * 60 * 24; }
  else if ($time_type == 'y'){ $ts = $val * 60 * 60 * 24 * 365; }
  else { die('Unknown time format given!'); }
  if ($check_time < (time()-$ts)){ return true; }
  return false;
}

//    ：
// timestamp to test: 
// (could be from an database or something else)
$time = 1146722922;
// long if check:
if (time_is_older_than('30m', $time)){
  print 'The given timestamp: ' . date('l dS \of F Y h:i:s A',$time);
  print " - is older than 30 minutes

";
}
else {
  print 'The given timestamp: ' . date('l dS \of F Y h:i:s A',$time);
  print " - is NOT older than 30 minutes

";
}
// short checks:
if (time_is_older_than('10s', $time)){ print "Is older than 10 seconds

"; }
if (time_is_older_than('200m', $time)){ print "Is older than 200 minutes

"; }
if (time_is_older_than('2h', $time)){ print "Is older than 2 hours

"; }
if (time_is_older_than('4d', $time)){ print "Is older than 4 days

"; }
if (time_is_older_than('1y', $time)){ print "Is older than one year

"; }

本稿で述べたphpプログラム設計に役立つことを願っています.