중복 지원 방지 소스 문의드립니다.! 채택완료

<? include $_SERVER["DOCUMENT_ROOT"]. "/include/func_common.inc.php"; include $_SERVER["DOCUMENT_ROOT"]. "/include/func_mysqld.inc.php"; include $_SERVER["DOCUMENT_ROOT"]. "/include/func_board.inc.php"; include $_SERVER["DOCUMENT_ROOT"]. "/include/func_user.inc.php"; $t_user_id = ($_POST['user_id'] == "")?$_GET['user_id']:$_POST['user_id']; $user_id = base64_decode($t_user_id); $Recruitment = ($_POST['Recruitment'] == "")?$_GET['Recruitment']:$_POST['Recruitment'];  MySQLConnectDB(); //select : intro_work //where : user_id ,Recruitment  $query = "SELECT user_name FROM tbl_member WHERE user_id = '$user_id'"; //query 보내서 user_name 가져오기 $result = MySQLQuery($query); $t_name = ""; while($list=MySQLFetchArray($result)){  $t_name = $list['user_name']; } //intro_work에 인서트  $regdate = date("Y-m-d");  $updata_reg = $regdate;  $insert_query = "INSERT INTO intro_work (        user_id   , name     , Recruitment           ) VALUES (        '$user_id'        , '$t_name'    , '$Recruitment'           )     ";  MySQLQuery($insert_query);  echo $insert_query;  MySQLCloseDB();?>