PHP 5.3.0 introduces two new error levels; E_DEPRECATED and E_USER_DEPRECATED. The E_DEPRECATED error level is used to indicated that a feature have been deprecated, the E_USER_DEPRECATED level should be used to indicate deprecated features in userland defined code, just like the E_USER_WARNING level for example.
The following is a list of deprecated INI directives, if one or more of these are activated, they will issue an deprecation notice upon startup.
Deprecated functions: