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<< Chapter 17 - PHP3 and PHP4

Differences between PHP3 and PHP4

(Last modified Aug 29, 2002 )

There are several differences between PHP3 and PHP4 that you should be aware of.

Cookies: PHP4 issues cookie header information in the reverse order from that of PHP3. If you have existing PHP3 code you will need to request a PHP3 enabled server or rewrite your code for handling cookies.

XHTML: PHP4 uses XHTML syntax for many of it's string processing functions such as nl2br(). See PHP documentation for full information.