(PECL apcu >= 4.0.0) Clears the APCu cache

(PECL runkit >= 0.7.0) Remove a function definition

(PECL wincache >= 1.1.0) Decrements the value associated with the key

(PECL wincache >= 1.1.0) Compares the variable with old value and assigns new value to it

(PHP 4, PHP 5, PHP 7) Sets which PHP errors are reported

(PECL apcu >= 4.0.0) Updates an old value with a new value

(PHP 4, PHP 5, PHP 7) Gets the value of a configuration option

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Generates a backtrace

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

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