php - how to detect username and password than login to different page -

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 <?php  if (isset($_post["loginbtn"])){     $euser = $_post["emp_username"];     $epassw = $_post["emp_password"];      $check_user = mysql_query("select * employee emp_username = '".$euser."'          , emp_password= '".$epassw."'");      if ($row=mysql_fetch_assoc($check_user)){         $_session["loggedin"] = "true";         $_session["eid"] = $row["emp_id"]; // keeps member id in session        header("location: profile.php"); // proceeds profile page     }else{     ?>         <script type = "text/javascript">         alert("invalid username or password");         </script>     <?php     } } ?>

i think need if condition inside block code:

if (isset($_post["loginbtn"])) {     $euser = $_post["emp_username"];     $epassw = $_post["emp_password"];     $check_user = mysql_query("select * employee emp_username = '".$euser."' > , emp_password= '".$epassw."'");      if ($row=mysql_fetch_assoc($check_user)) {         $_session["loggedin"] = "true";         $_session["eid"] = $row["emp_id"]; // keeps member id in session          if (in_array($row["position"], array("ceo", "manager", "...")) {             header("location: profile.php"); // proceeds profile page         }     } } else { ?> alert("invalid username or password");

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