נספח B. Migrating from PHP 3 to PHP 4

תוכן העניינים :
What has changed in PHP 4
Running PHP 3 and PHP 4 concurrently
Migrating Configuration Files
Parser behavior
Error reporting
Initializers
empty("0")
Missing functions
PHP 3 extension
Variable substitution in strings
Cookies
Handling of global variables

What has changed in PHP 4

PHP 4 and the integrated Zend engine have greatly improved PHPs performance and capabilities , but great care has been taken to break as little existing code as possible .