The php manual page http://www.php.net/manual/function.setcookie.php says "Multiple calls to setcookie() in the same script will be performed in reverse order. If you are trying to delete one cookie before inserting another you should put the insert before the delete."

This behaviour does not exist for my setup:
apache 1.3.12
php 4.0.0
configure options: --with-apache=../apache_1.3.12 --with-ftp --with-gd=../gd1.4   --with-ttf=../freetype-1.3.1  --with-mysql   --enable-track-vars --with-xml --with-mck=../cybercash/ --with-gettext --disable-debug --with-imap --enable-versioning

I'm not sure if that was an intentional change, but if it is, it's a little inconvenient for all the php3 scripts I have that delete cookies before setting them. Thanks!