What has changed in PHP 5.2.x

Most improvements in PHP 5.2.x have no impact on existing code. There are afew incompatibilitiesandnew error messagesthat should be considered, and code should be tested before switching PHP versions in production environments.

If the system is being upgraded from PHP 5.0.x, the manual section titledUpgrade Notes for PHP 5.1.xshould also be read.

Similarly, if the system is being upgraded from PHP 4, the manual section titledMigrating from PHP 4 to PHP 5should be read as well.