(PECL apcu >= 5.0.0) Get total cache hits

(PHP 7) Clear the most recent error void error_clear_last

(PECL apc >= 2.0.0) Clears the APC cache

(PECL apd 0.2-0.4) Throw an error, a callstack and then exit

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

(PHP 4, PHP 5, PHP 7) Returns an array with the names of included or required files

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

(PECL apc >= 3.0.0) Cache a variable in the data store

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

(PHP 4, PHP 5, PHP 7) Gets the version of the current Zend engine