체크박스, post 로 넘기고 받아서 다시 체크하기, checkbox

<? 
    if($_POST['search']) 
    { 
        $search=$_POST['search']; 
    } 
    else 
    { 
        $search=array(); 
    } 
$searchword = $_POST['searchword']
?> 
<form method="post" action="" name="search_form"> 
    <table align="center"> 
        <tr> 
            <td> 
                성명 <input type="checkbox" name="search[]" value="b_writer" <? if(in_array('b_writer',$search)){ echo 'checked="checked"';} ?>><br> 
                제목 <input type="checkbox" name="search[]" value="b_title" <? if(in_array('b_title',$search)){ echo 'checked="checked"';} ?>><br> 
                내용 <input type="checkbox" name="search[]" value="b_content" <? if(in_array('b_content',$search)){ echo 'checked="checked"';} ?>><br> 
          </td> 
          <td> 
              <font size="3"><input type="text" name="searchword" value="<? echo $searchword; ?>" size="20" maxlength="15"></font> 
              <font size="2" face="굴림"><input type="submit" value="검색"></font> 
          </td> 
      </tr> 
    </table> 
</form>