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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;
}
//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"; }
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