PHP Warning: Empty delimiter. in Server Error Log

I was doing some dead link testing on a site today and got this error.

[Mon Jun 15 16:27:14 2009] [error] PHP Warning: strstr() [<a href='function.strstr'>function.strstr</a>]: Empty delimiter. in /includes/functions/functions_general.php on line 996

The call is to Set back button function zen_back_link().

I just can not get my head around how it's screwing up the array.

I have never seen this error before.

Zen Cart 1.38a, with all patches, zj_silver template

I don't think in normal operation that this error ever comes up.

Any ideas?

Skip

  function zen_back_link() {
    if (sizeof($_SESSION['navigation']->path)-2 > 0) {
      $back = sizeof($_SESSION['navigation']->path)-2;
      $link = '<a href="' . zen_href_link($_SESSION['navigation']->path[$back]['page'], zen_array_to_string($_SESSION['navigation']->path[$back]['get'], array('action')), $_SESSION['navigation']->path[$back]['mode']) . '">';
    } else {
      if (isset($_SERVER['HTTP_REFERER']) && strstr(HTTP_SERVER, $_SERVER['HTTP_REFERER'])) {
        $link= $_SERVER['HTTP_REFERER'];
      } else {
        $link = '<a href="' . zen_href_link(FILENAME_DEFAULT) . '">';
      }
      $_SESSION['navigation'] = new navigationHistory;
    }
    return $link;
  }

looks like there is only one call to the strstr function there...only one thing i can imagine would be if the $_SERVER['HTTP_REFERER'] had a comma in it...strstr has two parameters + 1 optional.
http://us.php.net/manual/en/function.strstr.php

that last parameter is called before_needle, but acts much like a delimiter. I don't have an intimate knowledge of how PHP processes though...so I am not sure if that is really possible. But it IS a strange issue, i've never seen it before. Have you discovered anything else?

Thanks for the info.

The only thing that I have seen here and on the web is that it comes from a bad rewrite rule feed to the cart.
I guess adding some sanitizing to the string would fix it but the issue is not that high on list right now.

Skip

yeah sanitizing == smooth operashunz

skipwater:

Thanks for the info.

The only thing that I have seen here and on the web is that it comes from a bad rewrite rule feed to the cart.
I guess adding some sanitizing to the string would fix it but the issue is not that high on list right now.

Skip

Got the same errors msg in my log today?

PHP Warning: strstr(): Empty delimiter. in /home/content/d/y/t/xxx/html/includes/functions/functions_general.php on line 996

  if (isset($_SERVER['HTTP_REFERER']) && strstr(HTTP_SERVER, $_SERVER['HTTP_REFERER'])) 

Have not modified this file "functions_general.php" but did just install the Query Cache mod dont know if that has anything to add to this error or not?

I am having the same problem. It seems to have come up after some trojans were added to our site from a hack.

Is this the case with anyone else? Anyone found a fix?

Thanks, Bill

Might try this bugfix: http://www.zen-cart.com/forum/showpost.php?p=547637&postcount=20