javascript - in php i m creating registration and login but its not dynamic -

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<?php session_start(); if (isset($_post["btnsubmit"])) {     $nm=$_post["username"];     $pwd=$_post["password"];     $conn = new mysqli("localhost", "root", "", "simple_login");     // check connection     if ($conn->connect_error)     {         die("connection failed: " . $conn->connect_error);     }      $sql = "select * member username='$nm' , password='$pwd'" ;     $result = $conn->query($sql);     if ($result->num_rows > 0) {     // add sesssion value         $_session["memid"]=$row["mem_id"];         $_session["username"]=$row["username"];         header("location:demo2.php");     } } else { echo "wrong username or password" ; } ?>

in facing designing database problems , facing problems in storing session variables well

    <?php     session_start();     if (isset($_post["btnsubmit"]))     {         $nm=$_post["username"];         $pwd=$_post["password"];         $conn = new mysqli("localhost", "root", "", "simple_login");         // check connection         if ($conn->connect_error)         {             die("connection failed: " . $conn->connect_error);         }          $sql = "select * member username='$nm' , password='$pwd'" ;         $result = $conn->query($sql);     while($row = $result->fetch_array())       { $row["mem_id"]; $row["username"]; }         if ($result->num_rows > 0) {         // add sesssion value             $_session["memid"]=$_post["username"];             $_session["username"]=$_post["password"];             header("location:demo2.php");         }     } else { echo "wrong username or password" ; }     ?>

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