<?php session_start(); $email = $_POST['email']; $senha = $_POST['senha']; $conn = mysql_connect("localhost", "root", "123"); mysql_select_db("data_base", $conn); $sql = mysql_query("SELECT * FROM usuarios WHERE email='$email' && senha='$senha'"); $total = mysql_num_rows($sql); if (($email == '')||($senha == '')) { echo "<script language='javascript'>alert('Preencha todos os campos!');history.back(-1);</script>"; } else { if ($total == 1) { $_SESSION['logado'] == true; header("Location: admin.php"); die; } else { echo "<script language='javascript'>alert('Senha ou e-mail incorreto!');history.back(-1);</script>"; } } ?>