(PHP 5 >= 5.1.3, PHP 7) Gets system load average

(PHP 4, PHP 5, PHP 7) Tells what the user's browser is capable of

(PHP 4, PHP 5, PHP 7) Returns connection status bitfield

(PHP 4, PHP 5, PHP 7) Equivalent to exit

(PHP 4, PHP 5, PHP 7) Defines a named constant

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

(PHP 5, PHP 7) Return source with stripped comments and whitespace

(PHP 5 >= 5.1.0, PHP 7) Make the script sleep until the specified time

(PHP 4, PHP 5, PHP 7) Output a message and terminate the current script

(PHP 4, PHP 5, PHP 7) Set whether a client disconnect should abort script execution