Get week information of a certain month based on PHP

<?php
 function getMonthweeks($date){
 $ret=array();
  $stimestamp=strtotime($date);
  $mdays=date(&#39;t&#39;,$stimestamp);
  $msdate=date(&#39;Y-m-d&#39;,$stimestamp);
  $medate=date(&#39;Y-m-&#39;.$mdays,$stimestamp);
 $etimestamp = strtotime($medate);
 //獲取第一周
 $zcsy=6-date(&#39;w&#39;,$stimestamp);//第一周去掉第一天還有幾天
 $zcs1=$msdate;
 $zce1=date(&#39;Y-m-d&#39;,strtotime("+$zcsy day",$stimestamp));
 $ret[1]="第1周".$zcs1.&#39;~&#39;.$zce1;
 //獲取中間周次
 $jzc=0;
 //獲得當前月份是6周次還是5周次
 $jzc0="";
 $jzc6="";
 for($i=$stimestamp; $i<=$etimestamp; $i+=86400){
 if(date(&#39;w&#39;, $i) == 0){$jzc0++;}
 if(date(&#39;w&#39;, $i) == 6){$jzc6++;}
 }
 if($jzc0==5 && $jzc6==5)
 {
 $jzc=5;
 }else{
 $jzc=4;
 }
 date_default_timezone_set(&#39;PRC&#39;);
 $t = strtotime(&#39;+1 monday &#39;.$msdate);
 $n = 1;
 for($n=1; $n<$jzc; $n++) {
 $b = strtotime("+$n week -1 week", $t);
 $dsdate=date("Y-m-d", strtotime("-1 day", $b));
 $dedate=date("Y-m-d", strtotime("5 day", $b));
 $jzcz=$n+1;
 $ret[$jzcz]="第".$jzcz."周".$dsdate.&#39;~&#39;.$dedate;
 }
 //獲取最後一周
 $zcsy=date(&#39;w&#39;,$etimestamp);//最後一周是周幾日~六 0~6
 $zcs1=date(&#39;Y-m-d&#39;,strtotime("-$zcsy day",$etimestamp));
 $zce1=$medate;
 $jzcz=$jzc+1;
 $ret[$jzcz]="第".$jzcz."周".$zcs1.&#39;~&#39;.$zce1;
 return $ret;
}
$ret=getMonthweeks(&#39;2012-12-01&#39;);
for($i=0; $i<=count($ret); $i++) {
 echo @$ret[$i]."<br />";
}
?>