년별 월별 일별 시간 범위 구하기

function getDateRange($DATE, $format='Y-m-d H:i:s') {
$TS = strtotime(str_pad($DATE, 8, '01'));
$TE = strtotime((($l=strlen($DATE)) === 4 ? $DATE.'1231' : ($l === 6 ? $DATE.date('t', $TS) : $DATE)) . ' 23:59:59');
return array(
'start' => !$format ? $TS : date($format, $TS),
'end' => !$format ? $TE : date($format, $TE),
);
}

var_export(getDateRange('2011'));

array (
'start' => '2011-01-01 00:00:00',
'end' => '2011-12-31 23:59:59',
)

var_export(getDateRange('201205'));

array (
'start' => '2012-05-01 00:00:00',
'end' => '2012-05-31 23:59:59',
)

var_export(getDateRange('20131103'));

array (
'start' => '2013-11-03 00:00:00',
'end' => '2013-11-03 23:59:59',
)

var_export(getDateRange('20131103', false));

array (
'start' => 1383404400,
'end' => 1383490799,
)