Problem using fpassthru()

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  • Leslie Houk
    #1

    Problem using fpassthru()

    I'm just learning PHP, and I'm having a problem using fpassthru(). I
    want to download a file using the following code segment I found,
    which I put into my testing file called portal.php:

    $fileString = './' . $params[1];
    // translate file name properly for Internet Explorer.
    if ( strstr( $_SERVER['HTTP_USER_AGEN T'], "MSIE" )) {
    $params[1] = preg_replace( '/\./', '%2e', $params[1],
    substr_count($p arams[1], '.') - 1 );
    }
    header( "Cache-Control: " ); // leave blank for IE
    header( "Pragma: " ); // leave blank for IE
    header( "Content-type: application/octet-stream" );
    header( "Content-Disposition: attachment; filename=\"" .
    $params[1] . "\"" );
    header( "Content-length:" . (string)(filesi ze( $fileString )));
    sleep(1);
    $fdl = @fopen( $fileString, 'rb' );
    fpassthru( $fdl );

    However, when I run it, I get the following:

    Warning: Cannot modify header information - headers already sent
    by (output started at /export/home/.../portal.php:26) in
    /export/home/.../portal.php on line 178

    Warning: Cannot modify header information - headers already sent
    by (output started at /export/home/.../portal.php:26) in
    /export/home/.../portal.php on line 179

    Warning: Cannot modify header information - headers already sent
    by (output started at /export/home/.../portal.php:26) in
    /export/home/.../portal.php on line 180

    Warning: Cannot modify header information - headers already sent
    by (output started at /export/home/.../portal.php:26) in
    /export/home/.../portal.php on line 182

    Warning: Cannot modify header information - headers already sent
    by (output started at /export/home/.../portal.php:26) in
    /export/home/.../portal.php on line 183

    The contents of the file I am trying to download (an html file) is
    then displayed, interpreted as if it were appended to the end of
    portal.php. Does anyone know what is causing this, and how I can fix
    it? Thanks in advance to all who respond.
    Tags: None
    • Filth
      #2
      Re: Problem using fpassthru()

      > Warning: Cannot modify header information - headers already sent[color=blue]
      > by (output started at /export/home/.../portal.php:26) in
      > /export/home/.../portal.php on line 178
      >
      > Warning: Cannot modify header information - headers already sent
      > by (output started at /export/home/.../portal.php:26) in
      > /export/home/.../portal.php on line 179
      >
      > Warning: Cannot modify header information - headers already sent
      > by (output started at /export/home/.../portal.php:26) in
      > /export/home/.../portal.php on line 180
      >
      > Warning: Cannot modify header information - headers already sent
      > by (output started at /export/home/.../portal.php:26) in
      > /export/home/.../portal.php on line 182
      >
      > Warning: Cannot modify header information - headers already sent
      > by (output started at /export/home/.../portal.php:26) in
      > /export/home/.../portal.php on line 183[/color]

      these are ussually caused when you have already output data to the browser,
      if any output has been sent (even a single space) then headers can not be
      sent


        Comment

        • Leslie Houk
          #3
          Re: Problem using fpassthru()

          "Filth" <peter@petermcd onald.co.uk> wrote in message news:<ynjGc.361 $sw4.5393452@ne ws-text.cableinet. net>...[color=blue]
          >
          > these are usually caused when you have already output data to the browser,
          > if any output has been sent (even a single space) then headers can not be
          > sent[/color]

          Thanks for your response. Now, am I using the wrong technique to download
          a file from a host server? Is there a better way, or am I just using the
          correct technique incorrectly? I would appreciate some guidance, since
          PHP in general is still new to me.

            Comment

            • Andy Barfield
              #4
              Re: Problem using fpassthru()

              Leslie Houk wrote:[color=blue]
              > Does anyone know what is causing this, and how I can fix
              > it? Thanks in advance to all who respond.[/color]

              You need to use output buffering. Check the manual at
              http://www.php.net/ob_start for somewhere to start.

              Regards,

              Andy

                Comment

                • Leslie Houk
                  #5
                  Re: Problem using fpassthru()

                  Andy Barfield <abarfield_01@y ahoo.com> wrote in message news:<k6mdnXaa2 5Z_XHfdRVn-hQ@nildram.net> ...[color=blue]
                  > Leslie Houk wrote:[color=green]
                  > > Does anyone know what is causing this, and how I can fix
                  > > it? Thanks in advance to all who respond.[/color]
                  >
                  > You need to use output buffering. Check the manual at
                  > http://www.php.net/ob_start for somewhere to start.
                  >
                  > Regards,
                  >
                  > Andy[/color]

                  Andy,

                  Thanks for the link! The last user comment on that page pointed
                  me to "http://www.devshed.com/c/a/PHP/Output-Buffering-With-PHP/",
                  which told me exactly how to do what I need.

                  Leslie

                    Comment

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