<?php
// $LOGIN_INFORMATION = array('denemeisim1' => 'denemesifre1', 'admin2' => 'adminsifre2');
$LOGIN_INFORMATION = array('mesut');
define('USE_USERNAME', false);
if(isset($_GET['logout'])) { setcookie("verify", ''); header("Location: admin.php"); }
if(!function_exists('showLoginPasswordProtect')) {
function showLoginPasswordProtect($error_msg) {
?>
  <form method="post">
  <p>&nbsp;</p>
	  <h3>Giriş</h3>
    <font color="red"><?php echo $error_msg; ?></font><br />
<?php if (USE_USERNAME) echo 'Adınız:<br /><input type="input" name="access_login" /><br />Şifre:<br />'; ?>
    <input type="password" name="access_password" /><br /><br /><input type="submit" name="Submit" value="Giriş" />
  </form>
<?php die(); } } 
if (isset($_POST['access_password'])) {
  $login = isset($_POST['access_login']) ? $_POST['access_login'] : '';
  $pass = $_POST['access_password'];
  if (!USE_USERNAME && !in_array($pass, $LOGIN_INFORMATION)
  || (USE_USERNAME && ( !array_key_exists($login, $LOGIN_INFORMATION) || $LOGIN_INFORMATION[$login] != $pass ) ) 
  ) {
    showLoginPasswordProtect("Giriş Başarısız");
  }
  else {
	echo '<script>alert("Başarıyla giriş yaptınız");</script>';
    setcookie("verify", md5($pass));
  }
} else {
  if (!isset($_COOKIE['verify'])) { showLoginPasswordProtect(""); }
  $found = false;
  foreach($LOGIN_INFORMATION as $kay=>$val) {
    if ($_COOKIE['verify'] == md5($val)) {
      $found = true;
      break;
    }
  }
  if (!$found) {
    showLoginPasswordProtect("");
  }
}
?>