<?php
if(isset($_POST["submit"])==true){
$server="localhost";
$username="stmarksi";
$password="u8iiT4:-RiJM74";
$database="stmarksi_ict";
$link= mysqli_connect($server,$username,$password,$database);
if(!$link){
  die("ERROR:Websever could not connect to database");
  }
$user=$_POST["user"];
$pw=$_POST["pw"];
$query="SELECT pw FROM sms26122 where name='$user'";
$result= mysqli_query($link,$query);
$detail=mysqli_fetch_assoc($result);
if($detail==$pw){
echo "<h1>login success!</h1>";
}
}
else{
?>
<!DOCTYPE html>
<html>
    <h1>Login</h1>
    <form method="POST">
      username:<input type="text"name="user"<br>
      password:<input type="password"name="pw"<br>
      <input type="submit"name="submit"value="submit">
    </form>
</html>
<?php
}
?>