php友好格式化时间

/**
* 友好格式化时间
* @param int $timestamp 时间
* @param array $formats
* @return string
*/
public static function formatDateTime($timestamp, $formats = null)
{
if ($formats == null) {
$formats = array(
'DAY'           => '%s天前',
'DAY_HOUR'      => '%s天%s小时前',
'HOUR'          => '%s小时',
'HOUR_MINUTE'   => '%s小时%s分前',
'MINUTE'        => '%s分钟前',
'MINUTE_SECOND' => '%s分钟%s秒前',
'SECOND'        => '%s秒前',
);
}

/* 计算出时间差 */
$seconds = time() - $timestamp;
$minutes = floor($seconds / 60);
$hours   = floor($minutes / 60);
$days    = floor($hours / 24);

if ($days > 0 && $days < 31) {
$diffFormat = 'DAY';
} elseif($days == 0) {
$diffFormat = ($hours > 0) ? 'HOUR' : 'MINUTE';
if ($diffFormat == 'HOUR') {
$diffFormat .= ($minutes > 0 && ($minutes - $hours * 60) > 0) ? '_MINUTE' : '';
} else {
$diffFormat = (($seconds - $minutes * 60) > 0 && $minutes > 0)
? $diffFormat.'_SECOND' : 'SECOND';
}
}else{
$diffFormat = 'TURE_DATE_TIME';//超出30天, 正常时间显示
}

$dateDiff = null;
switch ($diffFormat) {
case 'DAY':
$dateDiff = sprintf($formats[$diffFormat], $days);
break;
case 'DAY_HOUR':
$dateDiff = sprintf($formats[$diffFormat], $days, $hours - $days * 60);
break;
case 'HOUR':
$dateDiff = sprintf($formats[$diffFormat], $hours);
break;
case 'HOUR_MINUTE':
$dateDiff = sprintf($formats[$diffFormat], $hours, $minutes - $hours * 60);
break;
case 'MINUTE':
$dateDiff = sprintf($formats[$diffFormat], $minutes);
break;
case 'MINUTE_SECOND':
$dateDiff = sprintf($formats[$diffFormat], $minutes, $seconds - $minutes * 60);
break;
case 'SECOND':
$dateDiff = sprintf($formats[$diffFormat], $seconds);
break;
default:
$dateDiff = date('Y-m-d H:i:s');
}
return $dateDiff;
}