PHP Manual
Appendices
Migrating from PHP 5.3.x to PHP 5.4.x
What has changed in PHP 5.4.x
Backward Incompatible Changes
New features
Changes in SAPI modules
Deprecated features in PHP 5.4.x
Changed Functions
New Functions
New Classes and Interfaces
New Methods
Removed Extensions
Other changes to extensions
New Global Constants
Changes to INI file handling
Other changes
Changes in SAPI modules
Changed Functions
Migrating from PHP 5.3.x to PHP 5.4.x
PHP Manual
Deprecated features in PHP 5.4.x
Deprecated functions:
mysql_list_dbs