<?php
  session_start();
  $_SESSION['isLogged'] = False;
  if( !isset($_SESSION['errCount']) ) $_SESSION['errCount'] = 0;
  else if( $_SESSION['errCount'] >= 3 ) die("Numarul de incercari permise a fost depasit");

  $user = $_POST['user'];
  $pass = $_POST['pass'];
 
  $link = mysql_connect("localhost","","") or die(mysql_error());
  mysql_select_db("login");
  $query = "SELECT `user`, `pass` FROM `login` WHERE `user` = '$user' AND `pass` = '$pass' LIMIT 1;";
  $result = mysql_query($query,$link) or die(mysql_error());
 
  if( empty($user) || empty($pass) )
     echo "Trebuie specificat un user si o parola";
  else if( mysql_affected_rows($link) > 0 ){
     echo "Felicitari ! Sunteti logat in sistem";
$_SESSION['isLogged'] = True;
  } else {
     echo "Pentru a va loga trebuie sa introduceti un user si o parola valide";
$_SESSION['errCount']++;
  } 
?>

mysql_connect("localhost","root","")

<?php

$user = $_POST['username'];
$pass = $_POST['password'];

?>

<?php

$sql = mysql_query("INSERT INTO nume_tabel (camp1, camp2) VALUES ('$user', '$pass')");
if($sql) echo 'Adaugarea s-a efectuat cu succes';
else echo 'A intervenit o eroare';

?>