The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.
POSIX_F_OK
(integer)
POSIX_R_OK
(integer)
POSIX_W_OK
(integer)
POSIX_X_OK
(integer)
POSIX_S_IFBLK
(integer)
POSIX_S_IFCHR
(integer)
POSIX_S_IFIFO
(integer)
POSIX_S_IFREG
(integer)
POSIX_S_IFSOCK
(integer)
Note:
These constants are available since PHP 5.1.0. Please also note that some of them may not be available in your system.