(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) 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) Defines a named constant

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

(PHP 4, PHP 5, PHP 7) Check whether client disconnected