Using SPLIT( ) to parse HTTP_REFERER

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  • John A. Irwin
    #1

    Using SPLIT( ) to parse HTTP_REFERER

    I'm very new to PHP and am trying to figure out how to parse out a
    variable "HTTP_REFER ER". My reason for this is my site was recently
    "FEATURED" (sic) on a website called FARK.COM. Because of this I
    received over 100,000 Hits in less then one hour and it caused my host's
    server farm to crash. While I understand that I could move to a more
    robust Web Host, I would rather trap any further links from FARK and
    redirect them to a rejection page at the following URL.

    502 Bad Gateway
    http://www.angelfire.com/crazy/actualclient/farkreject.htm


    In doing this I should be able to avoid another crash and save myself
    some phenomenal bandwidth charges.

    I tried the following code to attempt to isolate the word FARK from
    HTTP_REFERER thinking that the 2nd element of the array would be FARK
    (assuming that the HTTP_REFERER = "http://www.fark.com")

    My expected output would be
    $refer_array(1) = http://www
    $refer_array(2) = fark
    $refer_array(3) = com

    However what I get is the following message
    Parse error: parse error in /refer_test.php on line 11

    Here is the Code I'm using to display the results
    -------------------------------------------------------------------------------------------
    <html>
    <head>
    <title>Untitl ed Document</title>
    <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
    </head>

    <body>
    <?php //PHP ADODB document - made with PHAkt 2.2.0
    PRINT HTTP_REFERER

    $refer_array = split(".",HTTP_ REFERER);
    foreach ( $refer_array as $item )
    print "$item<BR>" ;
    ?>
    </body>
    </html>
    ---------------------------------------------------------------------------------------------

    Any help anyone could offer would be greatly appreciated by this
    bumbling n00bie

    Thanks
    John

    Tags: None
    • Jeffrey Silverman
      #2
      Re: Using SPLIT( ) to parse HTTP_REFERER

      On Mon, 21 Jul 2003 11:45:32 -0700, John A. Irwin wrote:
      [color=blue]
      > I'm very new to PHP and am trying to figure out how to parse out a
      > variable "HTTP_REFER ER". My reason for this is my site was recently[/color]
      <snip!>[color=blue]
      > Here is the Code I'm using to display the results
      > -------------------------------------------------------------------------------------------
      > <html>
      > <head>
      > <title>Untitl ed Document</title>
      > <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
      > </head>
      >
      > <body>
      > <?php //PHP ADODB document - made with PHAkt 2.2.0 PRINT HTTP_REFERER
      >
      > $refer_array = split(".",HTTP_ REFERER); foreach ( $refer_array as $item )
      > print "$item<BR>" ;
      > ?>
      > </body>
      > </html>
      > ---------------------------------------------------------------------------------------------
      >
      > Any help anyone could offer would be greatly appreciated by this bumbling
      > n00bie
      >
      > Thanks
      > John[/color]

      First of all, HTTP_REFERER is not a reliable variable to use. However,
      ignoring that aspect, try the following code:
      <?php

      $refer_array = split("\.",$_SE RVER['HTTP_HOST']); foreach ( $refer_array as $item )
      print "$item<BR>" ;
      ?>

      You need to escape the dot "." with a backslash "\." and you also forgot
      the dollar sign "$" indicating that HTTP_REFERER is a variable --
      $HTTP_REFERER.


      later...

      --
      Jeffrey D. Silverman | jeffrey AT jhu DOT edu
      Johns Hopkins University | Baltimore, MD
      Website | http://www.wse.jhu.edu/newtnotes/

        Comment

        • Actual Client
          #3
          Re: Using SPLIT( ) to parse HTTP_REFERER

          Jeff that seemed to work just fine, Thanks for taking the time to respond.


          Jeffrey Silverman wrote:[color=blue]
          > On Mon, 21 Jul 2003 11:45:32 -0700, John A. Irwin wrote:
          >
          >[color=green]
          >>I'm very new to PHP and am trying to figure out how to parse out a
          >>variable "HTTP_REFER ER". My reason for this is my site was recently[/color]
          >
          > <snip!>
          >[color=green]
          >>Here is the Code I'm using to display the results
          >>-------------------------------------------------------------------------------------------
          >><html>
          >><head>
          >><title>Untitl ed Document</title>
          >><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
          >></head>
          >>
          >><body>
          >><?php //PHP ADODB document - made with PHAkt 2.2.0 PRINT HTTP_REFERER
          >>
          >>$refer_arra y = split(".",HTTP_ REFERER); foreach ( $refer_array as $item )
          >> print "$item<BR>" ;
          >>?>
          >></body>
          >></html>
          >>---------------------------------------------------------------------------------------------
          >>
          >>Any help anyone could offer would be greatly appreciated by this bumbling
          >>n00bie
          >>
          >>Thanks
          >>John[/color]
          >
          >
          > First of all, HTTP_REFERER is not a reliable variable to use. However,
          > ignoring that aspect, try the following code:
          > <?php
          >
          > $refer_array = split("\.",$_SE RVER['HTTP_HOST']); foreach ( $refer_array as $item )
          > print "$item<BR>" ;
          > ?>
          >
          > You need to escape the dot "." with a backslash "\." and you also forgot
          > the dollar sign "$" indicating that HTTP_REFERER is a variable --
          > $HTTP_REFERER.
          >
          >
          > later...
          >[/color]

            Comment

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