(PECL uopz >= 2.0.2) Get or set flags on function or class

(PECL apd >= 0.2) Starts the remote session debugging

(PHP 4, PHP 5) Alias of

(PHP 5 >= 5.2.0, PHP 7) Get the last occurred error

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

(PHP 4, PHP 5, PHP 7) Gets the inode of the current script

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

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Gets options from the command line argument list

(PECL uopz >= 1.0.0) Overload a VM opcode

(PHP 5, PHP 7 >= 5.5.0, PHP 7) Returns the current process title