(PECL bcompiler >= 0.4) Reads and creates classes from a bcompiler exe file

(PECL apc >= 3.0.0) Removes a stored variable from the cache

(PHP 5 >= 5.2.0, PHP 7) Returns the peak of memory allocated by PHP

(PHP 4, PHP 5, PHP 7) Gets the value of an environment variable

(PECL uopz >= 1.0.0) Implements an interface at runtime

(PHP 4, PHP 5, PHP 7) Set/get the various assert flags

(PHP 7) Clear the most recent error void error_clear_last

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Returns an associative array with the names of all the constants and their

(PECL weakref >= 0.1.0) Releases a previously acquired reference

(PECL wincache >= 1.1.0) Retrieves information about user cache memory usage