(PHP 5, PHP 7) Returns a unique identifier for the current thread

(PHP 5 >= 5.5.5, PHP 7, PECL ZendOpcache > 7.0.2) Get configuration information about the cache

(PHP 4, PHP 5) Alias of

(PHP 5 >= 5.2.1, PHP 7) Returns directory path used for temporary files

(PHP 4 >= 4.0.1, PHP 5, PHP 7) Returns the type of interface between web server and PHP

(PECL runkit >= 0.8.0) Determines if the current functions return value will be used

(PECL uopz >= 1.0.0) Compose a class void

(PHP 4 >= 4.0.1, PHP 5, PHP 7) Restores the previous error handler function

(PECL apc >= 3.1.1) Decrease a stored number

(PECL uopz >= 1.0.0) Delete a function void