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<?php
  if(isset($_POST['username']) && isset($_POST['password']))
  {
    $user = $_POST['username'];
    $pass = $_POST['password'];

    if ($user === 'admin' && $pass === 'password')
    {
      //do something
    }
    else
    {
      //do something
    }
  }
?>

<!DOCTYPE html>
<html>
<head>
  <title>Login</title>
</head>
<body>
    <h1>login?</h1>

    <form method="POST" action="">
		<input type="text" name="username" placeholder="Username">
		<input type="password" name="password" placeholder="Password">
		<input type="submit" value="Submit">
	</form>
</body>
</html>