(PECL uopz >= 1.0.0) Redefine a constant void

(PECL apd 0.2-0.4) Return all current regular resources as an array

(PECL wincache >= 1.1.0) Deletes variables from the user cache

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

(PECL xhprof >= 0.9.0) Start XHProf profiling in sampling mode

(PHP 5 >= 5.3.0, PHP 7) Returns status of the circular reference collector

(PECL apcu >= 5.0.0) Constructs an APCUIterator iterator object

(PECL xhprof >= 0.9.0) Start xhprof profiler

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

(PECL apc >= 3.1.1) Get iterator key public