Saving data between pages

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  • Lamp
    #1

    Saving data between pages

    Is it possible to save session values between pages? I did a little script
    to let the users login. I use this script to check username and password the
    user introduces in a form in the main page, index.php.
    If a user is found with username and password, than I create
    $_SESSION['Login'] and assign it a value of true, else I assign it a value
    of false. If a user is non registered, I send it to the proper page to
    register, RegistraUtente. php, if he is registered yet, I send him back to
    index.php
    But here in index.php $_SESSION['Login'] has no value.

    Here is the script I wrote:

    <?php

    session_start() ;

    include("dbconn ect.php");

    $tabella="table ";

    $dbname="Zucca" ;

    if (!isset($_SESSI ON['Login']))

    {

    $_SESSION['Login']=false;

    }

    $IdUser=session _id();

    $data=date('Y-m-d');

    if (!ISSET($HTTP_C OOKIE_VARS["PiOnLine"]))

    setcookie("PiOn Line",$IdUser,t ime()+60*60*24* 365);

    else

    $IdUser=$HTTP_C OOKIE_VARS["PiOnLine"];

    mysql_select_db ($dbname,$db);

    $username=$_POS T["username"];

    $password=$_POS T["password"];

    $query="Select Username, UserPassword from $tabella where
    ('$password'=Us erPassword) and ('$username'=Us ername)";

    $result=mysql_q uery("$query") or die(mysql_error ());

    // Se esiste l'utente con username e password allora consenti il login

    if (mysql_num_rows ($result)==1)

    {

    $_SESSION['Login']=true;

    session_write_c lose();

    $url="index.php ";

    header ("Location: $url");

    }

    else // Invia l'utente sulla pagina di registrazione

    {

    $_SESSION['Login']=false;

    session_write_c lose();

    $url="RegistraU tente.php";

    header ("Location: $url");

    }

    ?>


    Franz





    Tags: None
    • Eric Stein
      #2
      Re: Saving data between pages

      The whole point of session variables is inter-pageview preservation. You
      just aren't using the session vars just right. Where you did:

      $_SESSION['Login']=true;

      You should have done:

      $Login = true;
      session_registe r("Login");

      Later, pages can access it as $HTTP_SESSION_V ARS["Login"]. I'm not sure if
      there are differences between $HTTP_SESSION_V ARS and $_SESSION - check the
      PHP docs @ http://www.php.net and remember to provide a logout:

      $Login=false;
      session_registe r("Login");

      You can also log the user out by using session_destroy ().
      ~Eric

      My PGP public key: http://www.parabolagames.com/chem/pgppubkey.txt

      "Lamp" <lamp@dina.it > wrote in message
      news:HQvic.1383 40$rM4.5430596@ news4.tin.it...[color=blue]
      > Is it possible to save session values between pages? I did a little script
      > to let the users login. I use this script to check username and password[/color]
      the[color=blue]
      > user introduces in a form in the main page, index.php.
      > If a user is found with username and password, than I create
      > $_SESSION['Login'] and assign it a value of true, else I assign it a value
      > of false. If a user is non registered, I send it to the proper page to
      > register, RegistraUtente. php, if he is registered yet, I send him back to
      > index.php
      > But here in index.php $_SESSION['Login'] has no value.
      >
      > Here is the script I wrote:
      >
      > <?php
      >
      > session_start() ;
      >
      > include("dbconn ect.php");
      >
      > $tabella="table ";
      >
      > $dbname="Zucca" ;
      >
      > if (!isset($_SESSI ON['Login']))
      >
      > {
      >
      > $_SESSION['Login']=false;
      >
      > }
      >
      > $IdUser=session _id();
      >
      > $data=date('Y-m-d');
      >
      > if (!ISSET($HTTP_C OOKIE_VARS["PiOnLine"]))
      >
      > setcookie("PiOn Line",$IdUser,t ime()+60*60*24* 365);
      >
      > else
      >
      > $IdUser=$HTTP_C OOKIE_VARS["PiOnLine"];
      >
      > mysql_select_db ($dbname,$db);
      >
      > $username=$_POS T["username"];
      >
      > $password=$_POS T["password"];
      >
      > $query="Select Username, UserPassword from $tabella where
      > ('$password'=Us erPassword) and ('$username'=Us ername)";
      >
      > $result=mysql_q uery("$query") or die(mysql_error ());
      >
      > // Se esiste l'utente con username e password allora consenti il login
      >
      > if (mysql_num_rows ($result)==1)
      >
      > {
      >
      > $_SESSION['Login']=true;
      >
      > session_write_c lose();
      >
      > $url="index.php ";
      >
      > header ("Location: $url");
      >
      > }
      >
      > else // Invia l'utente sulla pagina di registrazione
      >
      > {
      >
      > $_SESSION['Login']=false;
      >
      > session_write_c lose();
      >
      > $url="RegistraU tente.php";
      >
      > header ("Location: $url");
      >
      > }
      >
      > ?>
      >
      > Franz[/color]


        Comment

        • Chung Leong
          #3
          Re: Saving data between pages

          "Eric Stein" <no@spam.com> wrote in message
          news:c6k1ji$2an o$1@news.wplus. net...[color=blue]
          > The whole point of session variables is inter-pageview preservation. You
          > just aren't using the session vars just right. Where you did:
          >
          > $_SESSION['Login']=true;
          >
          > You should have done:
          >
          > $Login = true;
          > session_registe r("Login");[/color]

          No, $_SESSION['Login'] = true should work perfectly fine. I'm not entirely
          sure what the problem is. I suspect it has something to do with setting the
          cookie. In general when you're using session variables, you should keep your
          hand off the cookie. Stay away from session_registe r() too.


            Comment

            • Eric Stein
              #4
              Re: Saving data between pages

              Chung,
              Sorry, I didn't know - but I've been using session_registe r() for a long
              time and it's always worked. Why shouldn't I use it?
              ~Eric

              My PGP public key: http://www.parabolagames.com/chem/pgppubkey.txt

              "Chung Leong" <chernyshevsky@ hotmail.com> wrote in message
              news:scmdnYz1uc EFKhDd4p2dnA@co mcast.com...[color=blue]
              > No, $_SESSION['Login'] = true should work perfectly fine. I'm not entirely
              > sure what the problem is. I suspect it has something to do with setting[/color]
              the[color=blue]
              > cookie. In general when you're using session variables, you should keep[/color]
              your[color=blue]
              > hand off the cookie. Stay away from session_registe r() too.[/color]


                Comment

                • Daniel Tryba
                  #5
                  Re: Saving data between pages

                  Eric Stein <no@spam.com> wrote:[color=blue]
                  > Chung,
                  > Sorry, I didn't know - but I've been using session_registe r() for a long
                  > time and it's always worked. Why shouldn't I use it?[/color]

                  Because the manual says so :)
                  <q src='http://nl2.php.net/session_registe r'>
                  Caution

                  If you want your script to work regardless of register_global s, you need
                  to instead use the $_SESSION array as $_SESSION entries are
                  automatically registered. If your script uses session_registe r(), it
                  will not work in environments where the PHP directive register_global s
                  is disabled.
                  </q>

                  Also look at the other warnings.

                  --

                  Daniel Tryba

                    Comment

                    • .:Ninja
                      #6
                      Re: Saving data between pages

                      Eric Stein wrote:
                      [color=blue]
                      > The whole point of session variables is inter-pageview preservation. You
                      > just aren't using the session vars just right. Where you did:
                      >
                      > $_SESSION['Login']=true;
                      >
                      > You should have done:
                      >
                      > $Login = true;
                      > session_registe r("Login");
                      >
                      > Later, pages can access it as $HTTP_SESSION_V ARS["Login"]. I'm not sure
                      > if there are differences between $HTTP_SESSION_V ARS and $_SESSION - check
                      > the PHP docs @ http://www.php.net and remember to provide a logout:
                      >
                      > $Login=false;
                      > session_registe r("Login");
                      >
                      > You can also log the user out by using session_destroy ().
                      > ~Eric
                      >
                      > My PGP public key: http://www.parabolagames.com/chem/pgppubkey.txt
                      >
                      > "Lamp" <lamp@dina.it > wrote in message
                      > news:HQvic.1383 40$rM4.5430596@ news4.tin.it...[color=green]
                      >> Is it possible to save session values between pages? I did a little
                      >> script to let the users login. I use this script to check username and
                      >> password[/color]
                      > the[color=green]
                      >> user introduces in a form in the main page, index.php.
                      >> If a user is found with username and password, than I create
                      >> $_SESSION['Login'] and assign it a value of true, else I assign it a
                      >> value of false. If a user is non registered, I send it to the proper page
                      >> to register, RegistraUtente. php, if he is registered yet, I send him back
                      >> to index.php
                      >> But here in index.php $_SESSION['Login'] has no value.[/color][/color]

                      From the posted script the problem isn't immediately obvious. Other than
                      maybe the following. Are you testing the script on your local box running a
                      web server? Make sure that you access your script through
                      http://127.0.0.1/scriptname.php and not http://localhost/scriptname.php
                      because: If you session_start() on a "localhost" page, that session is not
                      available to a "127.0.0.1" page. On Apache, I can access
                      http://localhost/login.php no problem, but when I send the variable to a
                      relative path from login.php, Apache changes the hostname to the loopback
                      interface, 127.0.0.1, which of course the session won't work for.

                      Just a thought :)

                      ..:Albe

                      --
                      http://www.ninja.up.ac.za

                        Comment

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