Problema con sesión

[NSD]

mmm que intentas hacer con esto:

Código PHP:

$sql = mysql_query("SELECT * FROM members WHERE nick='$nick' AND password='$password' AND activacion='1'"); 
$login_check = mysql_num_rows($sql);
if($login_check > 0){ 
while($row = mysql_fetch_array($sql)){ 
// Get member ID into a session variable
$id = $row["id"]; 
$_SESSION['id'] = $id;
 
// Get member username into a session variable
$nick = $row["nick"]; 
$_SESSION['nick'] = $nick;
 
// Print success message here if all went well then exit the script
header("location: http://www.vacancesisortides.com/index.php"); 
exit();
} // close while
}
 

yo usaria:

Código PHP:

$sql = mysql_query("SELECT * FROM members WHERE nick='$nick' AND password='$password' AND activacion='1'"); 
    if(mysql_num_rows($sql) > 0) {
        $row = mysql_fetch_array($sql); 
        // Get member ID into a session variable
        $_SESSION['id'] = $row["id"];
 
        // Get member username into a session variable
        $_SESSION['nick'] = $row["nick"];
 
        // Print success message here if all went well then exit the script
        header("location: http://www.vacancesisortides.com/index.php"); 
        exit();
    } else {
 

dejendo ese detalle de lado, no veo en que momentos compruebas si el usuario ya esta logueado, podemos mejorar ese codigo pero el problema no esta alli...