请帮忙见见 为什么这个条件选择 总是选择不对

$weekarray = date("w");<br />
//echo $weekarray;<br />
if ($weekarray =5 ){<br />
<br />
	$tomorrow = dgmdate(TIMESTAMP + '259200', 'Y-m-d');<br />
	<br />
	}<br />
	<br />
	elseif($weekarray = '6'){<br />
$tomorrow = dgmdate(TIMESTAMP + '172800', 'Y-m-d');}<br />
<br />
    else {$tomorrow = dgmdate(TIMESTAMP + '86400', 'Y-m-d');}<br />
<br />
<br />
$todaytime = strtotime(dgmdate(TIMESTAMP, 'Ymd'));<br />

$_G['timestamp'] // 这个是　discuz 系统的专用的时间戳  <br />
$todaytime = strtotime(dgmdate(TIMESTAMP, 'Ymd'));  <br />
// 可以看到　'Ymd'　只精确到了天。因此$todaytime 的值类似于字符串 20121124