PHP Manual . Prev . Appendix C. Migrating from PHP 3 to PHP 4 . Next . PHP 3 had the bad habit of setting cookies in the reverse order of the setcookie() calls in your code. PHP 4 breaks with this habit and creates the cookie header lines in exactly the same order as you set the cookies in the code. ... Migrating from PHP/FI 2 to PHP 3 ...