Introduction
Those functions provides means to executes commands on the
system itself, and means secure such commands.
Requirements
These functions are available as part of the
standard module, which is always available.
Installation
There is no installation needed to use these
functions, they are part of the PHP core.
Runtime Configuration
This extension does not define any
configuration directives.
Resource Types
This extension does not define any resource types.
Predefined Constants
This extension does not define any constants.