inicio de sesion

[webankenovi]

<?php
// *** Validate request to login to this site.
if (!isset($_SESSION)) {
session_start();
}

esto esta mal seria asi

Código PHP:

<?php require_once('Connections/config.php'); ?>
<?php
sesion_start();
if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "") 
{
  if (PHP_VERSION < 6) {
    $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;
  }
 
  $theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);
 
  switch ($theType) {
    case "text":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;    
    case "long":
    case "int":
      $theValue = ($theValue != "") ? intval($theValue) : "NULL";
      break;
    case "double":
      $theValue = ($theValue != "") ? doubleval($theValue) : "NULL";
      break;
    case "date":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;
    case "defined":
      $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
      break;
  }
  return $theValue;
}
}
 
mysql_select_db($database_config, $config);
$query_Recordset1 = "SELECT * FROM ft_usuarios";
$Recordset1 = mysql_query($query_Recordset1, $config) or die(mysql_error());
$row_Recordset1 = mysql_fetch_assoc($Recordset1);
$totalRows_Recordset1 = mysql_num_rows($Recordset1);
 
$colname_Recordset2 = "-1";
if (isset($_SESSION['MM_username'])) {
  $colname_Recordset2 = $_SESSION['MM_username'];
}
mysql_select_db($database_config, $config);
$query_Recordset2 = sprintf("SELECT usuario FROM ft_usuarios WHERE usuario = %s", GetSQLValueString($colname_Recordset2, "text"));
$Recordset2 = mysql_query($query_Recordset2, $config) or die(mysql_error());
$row_Recordset2 = mysql_fetch_assoc($Recordset2);
$totalRows_Recordset2 = mysql_num_rows($Recordset2);
?>
<?php
// *** Validate request to login to this site.
if (!isset($_SESSION)) {
 
}
 
$loginFormAction = $_SERVER['PHP_SELF'];
if (isset($_GET['accesscheck'])) {
  $_SESSION['PrevUrl'] = $_GET['accesscheck'];
}
 
if (isset($_POST['usuario'])) {
  $loginUsername=$_POST['usuario'];
  $password=$_POST['pass'];
  $MM_fldUserAuthorization = "";
  $MM_redirectLoginSuccess = "index.php?seccion=welcome";
  $MM_redirectLoginFailed = "index.php?seccion=falleuser";
  $MM_redirecttoReferrer = false;
  mysql_select_db($database_config, $config);
  
  $LoginRS__query=sprintf("SELECT usuario, pass FROM ft_usuarios WHERE usuario=%s AND pass=%s",
    GetSQLValueString($loginUsername, "text"), GetSQLValueString($password, "text")); 
   
  $LoginRS = mysql_query($LoginRS__query, $config) or die(mysql_error());
  $loginFoundUser = mysql_num_rows($LoginRS);
  if ($loginFoundUser) {
     $loginStrGroup = "";
    
    //declare two session variables and assign them
    $_SESSION['MM_Username'] = $loginUsername;
    $_SESSION['MM_UserGroup'] = $loginStrGroup;       
 
    if (isset($_SESSION['PrevUrl']) && false) {
      $MM_redirectLoginSuccess = $_SESSION['PrevUrl'];  
    }
    header("Location: " . $MM_redirectLoginSuccess );
  }
  else {
    header("Location: ". $MM_redirectLoginFailed );
  }
}
?>
<div id="content-box">
        <div class="padding">
            <div class="login" id="element-box">
                <div class="t">
                    <div class="t">
                        <div class="t"></div>
                    </div>
                </div>
                <div class="m">
 
                    <h1>Ingreso de Usuarios Registrados</h1>
                    
                            <div id="section-box">
            <div class="t">
                <div class="t">
                    <div class="t"></div>
                </div>
            </div>
            <div class="m">
                <form ACTION="<?php echo $loginFormAction; ?>" style="clear: both;" id="form-login" name="login" method="POST">
    <p id="form-login-username">
        <label for="modlgn_username">Usuario</label>
        <input type="text" size="15" class="inputbox" id="modlgn_username" name="usuario">
    </p>
 
    <p id="form-login-password">
        <label for="modlgn_passwd">Contraseña</label>
        <input type="password" size="15" class="inputbox" id="modlgn_passwd" name="pass">
    </p>
        <p style="clear: both;" id="form-login-lang">
        
    <div class="button_holder">
    <div class="button1">
        <div class="next">
            <a onclick="login.submit();">
                Entrar</a>
 
        </div>
    </div>
    </div>
    <div class="clr"></div>
    <input type="submit" value="Entrar" style="border: 0; padding: 0; margin: 0; width: 0px; height: 0px;">
    
    
    </form>
<div class="clr"></div>
            </div>
<div class="b">
                <div class="b">
                    <div class="b"></div>
                </div>
            </div>
        </div>
        
                    <p>Ingresa un nombre de usuario y contraseña validos para acceder al Sistema.</p>
                    <p>
                        <a href="javascript:history.back(1)">Regresar a la Pagina Anterior</a>
                    </p>
                    <div id="lock"></div>
                    <div class="clr"></div>
                </div>
    <div class="h_green" id="border-top">
        <div>
            <div>
                <div class="adminform">Insurance Broker Sistem By ARTEM LABS, CA</div>
            </div>
        </div>
    </div>
                <div class="b">
                    <div class="b">
                        <div class="b"></div>
                    </div>
                </div>
            </div>
                        <div class="clr"></div>
        </div>
</div>
    <div id="border-bottom"><div><div></div></div>
</div>
</body><?php
mysql_free_result($Recordset1);
 
mysql_free_result($Recordset2);
?>
 

sessioin_start() siempre antes de verificar una sesion