php - Login page with mysql select where statment -

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i have simple login page, on top simple form validations if , elseif statments. want write mysql select statement below validation code (elseif) statment. if email , password = email , password on database table record, redirect use secured page, , final (else) show error if email or password don't exist or match in database.

i don't know how right way, attempt doesn't work:

    <?php require_once("includes/connection.php"); ?> <?php require_once("includes/functions.php"); ?> <?php  $email = $_post['email']; $hashed_password = md5($_post['password']);      if (isset($_post['submit'])) { // form has been submitted.          if ($_post['email'] == "") {                 $error = "email address required";         }         elseif (!(filter_var($_post['email'], filter_validate_email))) {             $error = "invalid email address";         }         elseif ($_post['password'] == "") {             $error = "type in password";         }         elseif (strlen($_post['password']) < 8) {             $error = "minimum password length 8";         }         elseif {             $query = "select id, email ";             $query .= "from customers ";             $query .= "where email = '{$email}' ";             $query .= "and hashed_password = '{$hashed_password}' ";             $query .= "limit 1";             $result_set = mysql_query($query);             redirect_to("account.php");         }         else {             echo "error";         }      }        ?>     <!-- signup box -->     <div id="box_sign">         <div class="container">             <div class="span12 box_wrapper">                 <div class="span12 box">                     <div>                         <div class="head">                             <h4>sign in</h4><br />                              <div class="text-error">                               <?php echo $error; ?><br />                               <p class="text-success"><strong><?php echo $success; ?></strong></p>                             </div>                         </div>                         <div class="form">                             <form action="sign-in.php" method="post">                                <input type="text" id="email" name="email" placeholder="email"/>                                <input type="password" id="password" name="password" placeholder="password"/>                                     <div class="right">                                         <a href="reset.html">forgot password?</a>                                     </div>                               <input type="submit" name="submit" class="btn" value="sign in"/>                             </form>                         </div>                     </div>                 </div>                 <p class="already">don't have account?                      <a href="signin.html">sign up</a></p>             </div>         </div>     </div>

redirect_to() not pre-defined php function, it's custom function , you've picked code somewhere else , forgot pick function code.. should this

function redirect_to($link) {    header('location: '.$link);    exit; }

also elseif { not valid, won't work without condition


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