[PHP] Empty Delimiter error

Let me try again: This line of the script: if (!stristr($lines[$key], $email)) { yields the following error: Warning: Empty delimiter in /home/sites/site56/web. Do you know what causes this error ? Thanks r -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: h

[PHP] Empty delimiter error - ??

I'm totally unfamiliar with php, and making some slight modificiations to Chris Heilmann's nice v 1.1 Newsleterscript. What exactly is meant by an empty delimiter? This code works just fine, but I get the following error: Warning: Empty delimiter in /home/sites/site56/web/trailcrew.php on line