체크박스, post 로 넘기고 받아서 다시 체크하기, checkbox > php

<?
    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>