PHP从checkbox取值

<input type="checkbox" name="weeks[]" id="weeks" value=1>  
<input type="checkbox" name="weeks[]" id="weeks" value=2>  
<input type="checkbox" name="weeks[]" id="weeks" value=3>

方法一：  
$weeks = $_POST['weeks'];  
for($i=0;$i<count($weeks);$i++)  
echo $weeks[$i]."<br>";   
  
方法二：  
$array = $this->request->getParameter("weeks[]");  
$str =implode(',',$array);  
echo $str;