(PECL apd >= 0.2) Restarts the interpreter

(PHP 7) Reclaims memory used by the Zend Engine memory manager

(PHP 4, PHP 5, PHP 7) Alias of

(PECL apcu >= 4.0.0) Removes a stored variable from the cache

(PECL wincache >= 1.1.0) Retrieves information about files cached in the session cache

(PECL wincache >= 1.1.0) Adds a variable in user cache only if variable does not already exist in the cache

(PECL runkit >= 0.7.0) Dynamically changes the code of the given method

(PECL apc >= 3.1.1) Rewinds iterator public

(PECL apd >= 0.2) Starts the session debugging

(PECL runkit >= 0.7.0) Check the PHP syntax of the specified file