php实现用已经过去多长时间的方式显示时间

function time_is_older_than($t,$check_time){
  $t = strtolower($t);
  $time_type = substr(preg_replace('/[^a-z]/','',$t),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;
}
//使用范例：
// 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',$time);
  print " - is older than 30 minutes<br/>n";
}
else {
  print 'The given timestamp: ' . date('l dS of F Y h:i:s A',$time);
  print " - is NOT older than 30 minutes<br/>n";
}
// short checks:
if (time_is_older_than('10s',$time)){ print "Is older than 10 seconds<br/>n"; }
if (time_is_older_than('200m',$time)){ print "Is older than 200 minutes<br/>n"; }
if (time_is_older_than('2h',$time)){ print "Is older than 2 hours<br/>n"; }
if (time_is_older_than('4d',$time)){ print "Is older than 4 days<br/>n"; }
if (time_is_older_than('1y',$time)){ print "Is older than one year<br/>n"; }