session_start failure

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  • Florence HENRY
    #1

    session_start failure

    Hello,

    I've searched about my problem on google before posting, but I didn't find
    anything relevant...

    I have a problem with session_start. Here is my code :

    <html>
    <head>
    <?php session_start() ;
    $id = session_id();
    $_SESSION['color'] = 'green'; ?>
    <title>PHP test</title>
    </head>
    <body>
    this is my ID : <?php echo $id; ?>
    <br />
    these are my data : <?php print_r($_SESSI ON); ?>
    </body>
    </html>

    the value printed by "echo $id" or "echo session_id()" is empty!
    As I use post or get to transmit the session id, my scripts don't work.

    The reason may be in the log. Here are the messages I get when I try to
    execute the code above :

    [Tue Mar 30 18:12:02 2004] [error] PHP Warning: session_start() : The
    session id contains invalid characters, valid characters are only a-z, A-Z
    and 0-9 in /home/www/session.php on line 3
    [Tue Mar 30 18:12:02 2004] [error] PHP Warning: Unknown(): The session id
    contains invalid characters, valid characters are only a-z, A-Z and 0-9 in
    Unknown on line 0
    [Tue Mar 30 18:12:02 2004] [error] PHP Warning: Unknown(): Failed to write
    session data (files). Please verify that the current setting of
    session.save_pa th is correct (/tmp) in Unknown on line 0

    How can the session id contain invalid characters, as it is PHP who decides
    it!

    I read many times the doc, I do not understand where I'm wrong...

    Thanks for any tip.

    --
    Florence HENRY
    florence point henry arobasse obspm point fr
    Tags: None
    • kingofkolt
      #2
      Re: session_start failure

      Florence --

      session_start() sends a cookie to the browser. A cookie is sent via the
      headers, which have to be sent to the browser BEFORE anything else (such as
      HTML) is sent. Attempting to set a cookie after you have already output HTML
      (the HTML you had output was "<html>" and "<head>") will result in an error.
      You have to move the session_start() command to the very beginnning of your
      PHP page. So your code should be changed to look like this:

      <?php session_start() ;
      $id = session_id();
      $_SESSION['color'] = 'green'; ?>
      <html>
      <head>
      <title>PHP test</title>
      </head>
      <body>
      this is my ID : <?php echo $id; ?>
      <br />
      these are my data : <?php print_r($_SESSI ON); ?>
      </body>
      </html>

      "Florence HENRY" <raslebol@duspa m.fr> wrote in message
      news:c4cdas$p4r $1@carbone.net. espci.fr...[color=blue]
      > Hello,
      >
      > I've searched about my problem on google before posting, but I didn't find
      > anything relevant...
      >
      > I have a problem with session_start. Here is my code :
      >
      > <html>
      > <head>
      > <?php session_start() ;
      > $id = session_id();
      > $_SESSION['color'] = 'green'; ?>
      > <title>PHP test</title>
      > </head>
      > <body>
      > this is my ID : <?php echo $id; ?>
      > <br />
      > these are my data : <?php print_r($_SESSI ON); ?>
      > </body>
      > </html>
      >
      > the value printed by "echo $id" or "echo session_id()" is empty!
      > As I use post or get to transmit the session id, my scripts don't work.
      >
      > The reason may be in the log. Here are the messages I get when I try to
      > execute the code above :
      >
      > [Tue Mar 30 18:12:02 2004] [error] PHP Warning: session_start() : The
      > session id contains invalid characters, valid characters are only a-z, A-Z
      > and 0-9 in /home/www/session.php on line 3
      > [Tue Mar 30 18:12:02 2004] [error] PHP Warning: Unknown(): The session id
      > contains invalid characters, valid characters are only a-z, A-Z and 0-9 in
      > Unknown on line 0
      > [Tue Mar 30 18:12:02 2004] [error] PHP Warning: Unknown(): Failed to[/color]
      write[color=blue]
      > session data (files). Please verify that the current setting of
      > session.save_pa th is correct (/tmp) in Unknown on line 0
      >
      > How can the session id contain invalid characters, as it is PHP who[/color]
      decides[color=blue]
      > it!
      >
      > I read many times the doc, I do not understand where I'm wrong...
      >
      > Thanks for any tip.
      >
      > --
      > Florence HENRY
      > florence point henry arobasse obspm point fr[/color]


        Comment

        • Andreas Paasch
          #3
          Re: session_start failure

          According to Vulcan logic - or learning thereof - kingofkolt wrote:
          [color=blue]
          > Florence --
          >
          > session_start() sends a cookie to the browser. A cookie is sent via the
          > headers, which have to be sent to the browser BEFORE anything else (such
          > as HTML) is sent. Attempting to set a cookie after you have already output
          > HTML (the HTML you had output was "<html>" and "<head>") will result in an
          > error. You have to move the session_start() command to the very beginnning
          > of your PHP page. So your code should be changed to look like this:
          >
          > <?php session_start() ;
          > $id = session_id();
          > $_SESSION['color'] = 'green'; ?>
          > <html>
          > <head>
          > <title>PHP test</title>
          > </head>
          > <body>
          > this is my ID : <?php echo $id; ?>
          > <br />
          > these are my data : <?php print_r($_SESSI ON); ?>
          > </body>
          > </html>
          >
          > "Florence HENRY" <raslebol@duspa m.fr> wrote in message
          > news:c4cdas$p4r $1@carbone.net. espci.fr...[color=green]
          >> Hello,
          >>
          >> I've searched about my problem on google before posting, but I didn't
          >> find anything relevant...
          >>
          >> I have a problem with session_start. Here is my code :
          >>
          >> <html>
          >> <head>
          >> <?php session_start() ;
          >> $id = session_id();
          >> $_SESSION['color'] = 'green'; ?>
          >> <title>PHP test</title>
          >> </head>
          >> <body>
          >> this is my ID : <?php echo $id; ?>
          >> <br />
          >> these are my data : <?php print_r($_SESSI ON); ?>
          >> </body>
          >> </html>
          >>
          >> the value printed by "echo $id" or "echo session_id()" is empty!
          >> As I use post or get to transmit the session id, my scripts don't work.
          >>
          >> The reason may be in the log. Here are the messages I get when I try to
          >> execute the code above :
          >>
          >> [Tue Mar 30 18:12:02 2004] [error] PHP Warning: session_start() : The
          >> session id contains invalid characters, valid characters are only a-z,
          >> A-Z and 0-9 in /home/www/session.php on line 3
          >> [Tue Mar 30 18:12:02 2004] [error] PHP Warning: Unknown(): The session
          >> [id
          >> contains invalid characters, valid characters are only a-z, A-Z and 0-9
          >> in Unknown on line 0
          >> [Tue Mar 30 18:12:02 2004] [error] PHP Warning: Unknown(): Failed to[/color]
          > write[color=green]
          >> session data (files). Please verify that the current setting of
          >> session.save_pa th is correct (/tmp) in Unknown on line 0
          >>
          >> How can the session id contain invalid characters, as it is PHP who[/color]
          > decides[color=green]
          >> it!
          >>
          >> I read many times the doc, I do not understand where I'm wrong...
          >>
          >> Thanks for any tip.
          >>
          >> --
          >> Florence HENRY
          >> florence point henry arobasse obspm point fr[/color][/color]

          Damn, I should have seen that. I was looking at it, but didn't see the
          obvious.

          /Andreas
          --
          Peace and long life ...
          Registeret Linux user #292411

            Comment

            • Florence HENRY
              #4
              Re: session_start failure

              kingofkolt a écrit :
              [color=blue]
              > session_start() sends a cookie to the browser. A cookie is sent via the
              > headers, which have to be sent to the browser BEFORE anything else (such
              > as HTML) is sent. Attempting to set a cookie after you have already output
              > HTML (the HTML you had output was "<html>" and "<head>") will result in an
              > error. You have to move the session_start() command to the very beginnning
              > of your PHP page. So your code should be changed to look like this:[/color]

              Thanks for your explanation. It works nice now!

              Obviously, I did not understand what the manual said... I did not undersand
              that cookies was the default method used, then I did not take care of the
              sentence saying "If you are using cookie-based sessions, you must call
              session_start() before anything is outputted to the browser."


              --
              Florence HENRY
              florence point henry arobasse obspm point fr

                Comment

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