Migrating from PHP 3 to PHP 4Podręcznik PHPPoprzedniNastępnyDodatek C. Migrating from PHP 3 to PHP 4Spis treściWhat has changed in PHP 4Running PHP 3 and PHP 4 concurrentlyMigrating Configuration FilesParser behaviorError reportingInitializersempty("0")Missing functionsPHP 3 extensionVariable substitution in stringsCookiesWhat has changed in PHP 4 PHP 4 and the integrated Zend engine have greatly inproved PHPs performance and capabilities, but great care has been taken to break as little existing code as possible. So migrating your code from PHP 3 to 4 should be much easier than migrating from PHP/FI 2 to PHP 3. A lot of existing PHP 3 code should be ready to run without changes, but you should still know about the few differences and take care to test your code before switching versions in production environments. The following should give you some hints about what to look for. PoprzedniSpis treściNastępnyUsing PHP from the command linePoczątek rozdziałuRunning PHP 3 and PHP 4 concurrently