<?php
include ("conexion.php");
include ("pvpgn_hash.php");
$usuario = strtolower(trim($_POST['usuario']));
$password = strtolower(pvpgn_hash(trim($_POST['password'])));
$consulta = mysql_query("SELECT * FROM bnet where acct_username='$usuario'");
if (mysql_num_rows($consulta) > 0) {
    while ($row = mysql_fetch_array($consulta)) {
		$acct_username = $row['acct_username'];
		if ($acct_username == $usuario) {
			echo "Usuario correcto.";
			$acct_password = $row['acct_passhash1'];
			if ($acct_password == $password) {
				echo "Contraseña correcta.";
				session_start();
				$_SESSION['usuario'] = $usuario;
				$email = $row['acct_email'];
				$_SESSION['email'] = $email;
				header("Location: index.php");
			} else{
				echo "Contraseña incorrecta.";
				header("Location: index.php?error=1");
			}
		} else {
			echo "Usuario incorrecto.";
			header("Location: index.php?error=0");
		}
	}
 } else die("No paso el mysql_num_rows");
 ?>

if (($usuario=="") || ($password==""))
 

cadena = "hola"
for caracter in cadena:
    print caracter
 

for caracter in cadena:
    if caracter == ' ':
        blancos += 1