Confusing session behaviour

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  • David Haynes
    #1

    Confusing session behaviour

    I am running Apache 2, PHP 5.0.5, and windows XP

    I have one php file that populates a SESSION variable and another that
    consumes it.

    If I call the first one from the URL line of the browser, the form fills
    correctly (i.e. the values are passed in the session)

    If I call the first program from the second via an <a href> the session
    is lost.

    So, from the browser URL, the order would be:
    [first.php]
    session_start() ;
    $_SESSION['foo'] = $foo;
    session_write_c lose();
    header("locatio n: second.php");
    exit;

    [second.php]
    session_start() ;
    $foo = $_SESSION['foo'];
    print_r($foo);

    This works.

    If I change second.php to be:
    session_start() ;
    $foo = $_SESSION['foo'];
    <a href="first.php ">first</a>

    then the session is empty when the href is selected.

    What am I missing?
    -david-

    Tags: None
    • Janwillem Borleffs
      #2
      Re: Confusing session behaviour

      David Haynes wrote:[color=blue]
      > If I call the first program from the second via an <a href> the
      > session is lost.
      >
      > So, from the browser URL, the order would be:
      > [first.php]
      > session_start() ;
      > $_SESSION['foo'] = $foo;
      >[/color]

      Where is $foo initially defined?


      JW


        Comment

        • David Haynes
          #3
          Re: Confusing session behaviour

          Janwillem Borleffs wrote:[color=blue]
          > David Haynes wrote:[color=green]
          >> If I call the first program from the second via an <a href> the
          >> session is lost.
          >>
          >> So, from the browser URL, the order would be:
          >> [first.php]
          >> session_start() ;
          >> $_SESSION['foo'] = $foo;
          >>[/color]
          >
          > Where is $foo initially defined?
          >
          >
          > JW
          >
          >[/color]
          $foo just represents some meaningful data.

          I have a real minimal example now:

          [file: foo.ctrl.php]

          <?php
          session_start() ;
          $foo[] = array('this'=>1 , 'that'=>2);
          $_SESSION['foo'] = $foo;
          session_write_c lose();
          header('locatio n: foo.php');
          exit;
          ?>

          [file: foo.php]

          <?php
          session_start() ;
          printf("_SESSIO N<br>\n");
          $foo = $_SESSION['foo'];
          print_r($foo);
          echo <<<EOF
          <html>
          <head></head>
          <body>
          <br/>
          <a href="foo.ctrl. php>foo</a>
          </body>
          EOF;
          ?>

          Calling foo.ctrl.php from the browser URL produces:
          _SESSION
          Array ( [0] => Array ( [this] => 1 [that] => 2 ) )
          foo

          clicking on the 'foo' link produces:
          _SESSION

          foo

          -david-

            Comment

            • Janwillem Borleffs
              #4
              Re: Confusing session behaviour

              David Haynes wrote:[color=blue]
              > Calling foo.ctrl.php from the browser URL produces:
              > _SESSION
              > Array ( [0] => Array ( [this] => 1 [that] => 2 ) )
              > foo
              >
              > clicking on the 'foo' link produces:
              > _SESSION
              >[/color]

              Beside that the assignment $foo[] = ... causes foo to be populated with
              another array, this works on my environment as expected.

              Make sure that the session.cookie_ path directive in your ini file is set to
              "/"; also try to set the session.use_tra ns_sid directive in the same file to
              "1", which should cause the session id to be appended to the link when there
              are problems setting the cookie.


              JW


                Comment

                • David Haynes
                  #5
                  Re: Confusing session behaviour

                  Janwillem Borleffs wrote:[color=blue]
                  > David Haynes wrote:[color=green]
                  >> Calling foo.ctrl.php from the browser URL produces:
                  >> _SESSION
                  >> Array ( [0] => Array ( [this] => 1 [that] => 2 ) )
                  >> foo
                  >>
                  >> clicking on the 'foo' link produces:
                  >> _SESSION
                  >>[/color]
                  >
                  > Beside that the assignment $foo[] = ... causes foo to be populated with
                  > another array, this works on my environment as expected.
                  >
                  > Make sure that the session.cookie_ path directive in your ini file is set to
                  > "/"; also try to set the session.use_tra ns_sid directive in the same file to
                  > "1", which should cause the session id to be appended to the link when there
                  > are problems setting the cookie.
                  >
                  >
                  > JW
                  >
                  >[/color]
                  Thanks for the suggestions JW.

                  Unfortunately, they did not fix my problem. Maybe its a windows or php
                  5.0.5. thing?

                  I'll move the example to Linux and see what happens.

                  -david-

                    Comment

                    • David Haynes
                      #6
                      Re: Confusing session behaviour

                      David Haynes wrote:[color=blue]
                      > Janwillem Borleffs wrote:[color=green]
                      >> David Haynes wrote:[color=darkred]
                      >>> Calling foo.ctrl.php from the browser URL produces:
                      >>> _SESSION
                      >>> Array ( [0] => Array ( [this] => 1 [that] => 2 ) )
                      >>> foo
                      >>>
                      >>> clicking on the 'foo' link produces:
                      >>> _SESSION
                      >>>[/color]
                      >>
                      >> Beside that the assignment $foo[] = ... causes foo to be populated
                      >> with another array, this works on my environment as expected.
                      >>
                      >> Make sure that the session.cookie_ path directive in your ini file is
                      >> set to "/"; also try to set the session.use_tra ns_sid directive in the
                      >> same file to "1", which should cause the session id to be appended to
                      >> the link when there are problems setting the cookie.
                      >>
                      >>
                      >> JW
                      >>[/color]
                      > Thanks for the suggestions JW.
                      >
                      > Unfortunately, they did not fix my problem. Maybe its a windows or php
                      > 5.0.5. thing?
                      >
                      > I'll move the example to Linux and see what happens.
                      >
                      > -david-
                      >[/color]
                      It turns out to be firewall-related. When I disabled my (local)
                      firewall, the application worked as I expected.

                      Thanks for all the suggestions folks.

                      -david-

                        Comment

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