php实现用已经过去多长时间的方式显示时间

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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"; }