php - Redirect to Index Page if the Submitted Form Has no Username or Password -

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what wrong in code?

if(isset($_request["ok"])) {     $id= mysql_real_escape_string($_request["usr"]);     $pwd=mysql_real_escape_string($_request["pass"]);     $row=mysql_query("select * tbl_login usr_id='$id' , password='$pwd'");     $data=mysql_fetch_array($row);     if($pwd==$data["password"]) {         $usr=mysql_query("select * tbl_usr u_id='".$data['u_id']."'");         $nm=mysql_fetch_array($usr);         $_session["usr"]=$nm["u_fname"];         $_session["id"]=$nm["u_id"];         header("location:index.php");     } else {         $msg="email or password not valid";     } }

and html code 

<form  method="post" enctype="multipart/form-data" > email-id<input type="text" name="usr" /> <br/>     password<input type="password" name="pass"/>     <input type="submit" value="login" name="ok" /> </form>

when user clicks on submit button without filling username , password, page should redirect index page.

in statement

if($pwd==$data["password"]) {     $usr=mysql_query("select * tbl_usr u_id='".$data['u_id']."'");     $nm=mysql_fetch_array($usr);     $_session["usr"]=$nm["u_fname"];     $_session["id"]=$nm["u_id"];     header("location:index.php"); }

since both $pwd , $data["password"] null, go inside if statement , redirect page index.php.


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