This module contains an interface to those
functions defined in the IEEE 1003.1 (POSIX.1)
standards document which are not accessible through
other means. POSIX.1 for example defined the open(),
read(), write() and close() functions, too, which
traditionally have been part of PHP 3 for a long time.
Some more system specific functions have not been
available before, though, and this module tries to
remedy this by providing easy access to these
functions.
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注: This extension is not available on Windows platforms.
POSIX functions are enabled by default. You can
disable POSIX-like functions with
--disable-posix.
The section about Process
Control Functions maybe of interest for you.