Cookie problems (simple code included)

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  • ii2o
    #1

    Cookie problems (simple code included)

    Hi all,

    I'm trying to develop a website that selects from 3 stylesheets
    depending on which style they have chosen. Their preference is stored
    in a cookie and this is where the problems begin. I have boiled my code
    down to the bare essentials in the hope that someone can help me with
    this problem. I would be grateful if you could explain what I have done
    is wrong too, because I read that cookie settings should be done before
    the <htmltag, which is what I have done.

    === CODE (this can be copied and pasted into a php file) ===

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
    "http://www.w3.org/TR/html4/loose.dtd">
    <?php
    $cstyle = (int)$_COOKIE["cstyle"];
    print("***$csty le***");

    if ($cstyle < 1 || $cstyle 3)
    {
    $cstyle = 1;
    }

    @extract($_POST );
    $cstylenew = (int)$_GET['cstyle'];

    if ($cstylenew >= 1 && $cstylenew <= 3)
    {
    setcookie("csty le3", "$cstylenew ", time()+5000000) ;
    }
    ?>

    <html>

    <head>
    <link href="style<?ph p print($cstyle); ?>.css" rel="stylesheet "
    type="text/css">
    </head>

    <body>
    <br>
    <a href="<?php print("$PHP_SEL F"); ?>?cstyle=1">st yle 1</a><br>
    <a href="<?php print("$PHP_SEL F"); ?>?cstyle=2">st yle 2</a><br>
    <a href="<?php print("$PHP_SEL F"); ?>?cstyle=3">st yle 3</a><br>
    </body>
    </html>

    Best regards,
    ii2o

    Tags: None
    • Kim André Akerø
      #2
      Re: Cookie problems (simple code included)

      ii2o wrote:
      Hi all,
      >
      I'm trying to develop a website that selects from 3 stylesheets
      depending on which style they have chosen. Their preference is stored
      in a cookie and this is where the problems begin. I have boiled my
      code down to the bare essentials in the hope that someone can help me
      with this problem. I would be grateful if you could explain what I
      have done is wrong too, because I read that cookie settings should be
      done before the <htmltag, which is what I have done.
      >
      === CODE (this can be copied and pasted into a php file) ===
      >
      <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
      "http://www.w3.org/TR/html4/loose.dtd">
      <?php
      $cstyle = (int)$_COOKIE["cstyle"];
      print("***$csty le***");
      >
      if ($cstyle < 1 || $cstyle 3)
      {
      $cstyle = 1;
      }
      >
      @extract($_POST );
      $cstylenew = (int)$_GET['cstyle'];
      >
      if ($cstylenew >= 1 && $cstylenew <= 3)
      {
      setcookie("csty le3", "$cstylenew ", time()+5000000) ;
      }
      ?>
      >
      <html>
      >
      <head>
      <link href="style<?ph p print($cstyle); ?>.css" rel="stylesheet "
      type="text/css">
      </head>
      >
      <body>
      <br>
      <a href="<?php print("$PHP_SEL F"); ?>?cstyle=1">st yle 1</a><br>
      <a href="<?php print("$PHP_SEL F"); ?>?cstyle=2">st yle 2</a><br>
      <a href="<?php print("$PHP_SEL F"); ?>?cstyle=3">st yle 3</a><br>
      </body>
      </html>
      >
      Best regards,
      ii2o
      Cookies are set in the headers, meaning that setcookie() must be called
      before *any* output is sent to the user (even before your DOCTYPE
      statement). Make sure that you don't have any blank spaces before <?php
      as well.

      --
      Kim André Akerø
      - kimandre@NOSPAM betadome.com
      (remove NOSPAM to contact me directly)

        Comment

        • ii2o
          #3
          Re: Cookie problems (simple code included)

          Hi there,

          Thanks for the response. Unfortunately even when I move the doctype
          statement to below the php code, I still get the following error
          "Warning: Cannot modify header information - headers already sent by
          (output started at d:\testserver\t estcookies.php: 3) in
          d:\testserver\t estcookies.php on line 14".

          When you mean before any output is sent to the user, do you mean that I
          can't use the $_GET statement? If so, how is possible to select a
          stylesheet in the code without accessing this variable?

          I'm very confused!

          Thanks,
          ii2o


          Kim André Akerø wrote:
          ii2o wrote:
          >
          Hi all,

          I'm trying to develop a website that selects from 3 stylesheets
          depending on which style they have chosen. Their preference is stored
          in a cookie and this is where the problems begin. I have boiled my
          code down to the bare essentials in the hope that someone can help me
          with this problem. I would be grateful if you could explain what I
          have done is wrong too, because I read that cookie settings should be
          done before the <htmltag, which is what I have done.

          === CODE (this can be copied and pasted into a php file) ===

          <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
          "http://www.w3.org/TR/html4/loose.dtd">
          <?php
          $cstyle = (int)$_COOKIE["cstyle"];
          print("***$csty le***");

          if ($cstyle < 1 || $cstyle 3)
          {
          $cstyle = 1;
          }

          @extract($_POST );
          $cstylenew = (int)$_GET['cstyle'];

          if ($cstylenew >= 1 && $cstylenew <= 3)
          {
          setcookie("csty le3", "$cstylenew ", time()+5000000) ;
          }
          ?>

          <html>

          <head>
          <link href="style<?ph p print($cstyle); ?>.css" rel="stylesheet "
          type="text/css">
          </head>

          <body>
          <br>
          <a href="<?php print("$PHP_SEL F"); ?>?cstyle=1">st yle 1</a><br>
          <a href="<?php print("$PHP_SEL F"); ?>?cstyle=2">st yle 2</a><br>
          <a href="<?php print("$PHP_SEL F"); ?>?cstyle=3">st yle 3</a><br>
          </body>
          </html>

          Best regards,
          ii2o
          >
          Cookies are set in the headers, meaning that setcookie() must be called
          before *any* output is sent to the user (even before your DOCTYPE
          statement). Make sure that you don't have any blank spaces before <?php
          as well.
          >
          --
          Kim André Akerø
          - kimandre@NOSPAM betadome.com
          (remove NOSPAM to contact me directly)

            Comment

            • Kim André Akerø
              #4
              Re: Cookie problems (simple code included)

              ii2o wrote:
              Kim André Akerø wrote:
              ii2o wrote:
              Hi all,
              >
              I'm trying to develop a website that selects from 3 stylesheets
              depending on which style they have chosen. Their preference is
              stored in a cookie and this is where the problems begin. I have
              boiled my code down to the bare essentials in the hope that
              someone can help me with this problem. I would be grateful if you
              could explain what I have done is wrong too, because I read that
              cookie settings should be done before the <htmltag, which is
              what I have done.
              >
              === CODE (this can be copied and pasted into a php file) ===
              >
              <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
              "http://www.w3.org/TR/html4/loose.dtd">
              <?php
              $cstyle = (int)$_COOKIE["cstyle"];
              print("***$csty le***");
              >
              if ($cstyle < 1 || $cstyle 3)
              {
              $cstyle = 1;
              }
              >
              @extract($_POST );
              $cstylenew = (int)$_GET['cstyle'];
              >
              if ($cstylenew >= 1 && $cstylenew <= 3)
              {
              setcookie("csty le3", "$cstylenew ", time()+5000000) ;
              }
              ?>
              >
              <html>
              >
              <head>
              <link href="style<?ph p print($cstyle); ?>.css" rel="stylesheet "
              type="text/css">
              </head>
              >
              <body>
              <br>
              <a href="<?php print("$PHP_SEL F"); ?>?cstyle=1">st yle
              1</a><br <a href="<?php print("$PHP_SEL F");
              ?>?cstyle=2">st yle 2</a><br <a href="<?php
              print("$PHP_SEL F"); ?>?cstyle=3">st yle 3</a><br </body>
              </html>
              >
              Best regards,
              ii2o
              Cookies are set in the headers, meaning that setcookie() must be
              called before any output is sent to the user (even before your
              DOCTYPE statement). Make sure that you don't have any blank spaces
              before <?php as well.
              >
              Hi there,
              >
              Thanks for the response. Unfortunately even when I move the doctype
              statement to below the php code, I still get the following error
              "Warning: Cannot modify header information - headers already sent by
              (output started at d:\testserver\t estcookies.php: 3) in
              d:\testserver\t estcookies.php on line 14".
              >
              When you mean before any output is sent to the user, do you mean that
              I can't use the $_GET statement? If so, how is possible to select a
              stylesheet in the code without accessing this variable?
              >
              I'm very confused!
              print() is considered sending output, too.

              --
              Kim André Akerø
              - kimandre@NOSPAM betadome.com
              (remove NOSPAM to contact me directly)

                Comment

                • ii2o
                  #5
                  Re: Cookie problems (simple code included)

                  Brilliant - I see where I was going wrong now. Thanks for your help!
                  ii2o

                  Kim André Akerø wrote:
                  ii2o wrote:
                  >
                  Kim André Akerø wrote:
                  ii2o wrote:
                  >
                  Hi all,

                  I'm trying to develop a website that selects from 3 stylesheets
                  depending on which style they have chosen. Their preference is
                  stored in a cookie and this is where the problems begin. I have
                  boiled my code down to the bare essentials in the hope that
                  someone can help me with this problem. I would be grateful if you
                  could explain what I have done is wrong too, because I read that
                  cookie settings should be done before the <htmltag, which is
                  what I have done.

                  === CODE (this can be copied and pasted into a php file) ===

                  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
                  "http://www.w3.org/TR/html4/loose.dtd">
                  <?php
                  $cstyle = (int)$_COOKIE["cstyle"];
                  print("***$csty le***");

                  if ($cstyle < 1 || $cstyle 3)
                  {
                  $cstyle = 1;
                  }

                  @extract($_POST );
                  $cstylenew = (int)$_GET['cstyle'];

                  if ($cstylenew >= 1 && $cstylenew <= 3)
                  {
                  setcookie("csty le3", "$cstylenew ", time()+5000000) ;
                  }
                  ?>

                  <html>

                  <head>
                  <link href="style<?ph p print($cstyle); ?>.css" rel="stylesheet "
                  type="text/css">
                  </head>

                  <body>
                  <br>
                  <a href="<?php print("$PHP_SEL F"); ?>?cstyle=1">st yle
                  1</a><br <a href="<?php print("$PHP_SEL F");
                  ?>?cstyle=2">st yle 2</a><br <a href="<?php
                  print("$PHP_SEL F"); ?>?cstyle=3">st yle 3</a><br </body>
                  </html>

                  Best regards,
                  ii2o
                  >
                  Cookies are set in the headers, meaning that setcookie() must be
                  called before any output is sent to the user (even before your
                  DOCTYPE statement). Make sure that you don't have any blank spaces
                  before <?php as well.
                  Hi there,

                  Thanks for the response. Unfortunately even when I move the doctype
                  statement to below the php code, I still get the following error
                  "Warning: Cannot modify header information - headers already sent by
                  (output started at d:\testserver\t estcookies.php: 3) in
                  d:\testserver\t estcookies.php on line 14".

                  When you mean before any output is sent to the user, do you mean that
                  I can't use the $_GET statement? If so, how is possible to select a
                  stylesheet in the code without accessing this variable?

                  I'm very confused!
                  >
                  print() is considered sending output, too.
                  >
                  --
                  Kim André Akerø
                  - kimandre@NOSPAM betadome.com
                  (remove NOSPAM to contact me directly)

                    Comment

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