Php/docs/posix.constants.mknod
From Get docs
posix_mknod() constants
Note:
These constants are available starting with PHP 5.1.0. Please note that some of them may not be available on your system.
POSIX_S_IFBLK(int)- Block special file
POSIX_S_IFCHR(int)- Character special file
POSIX_S_IFIFO(int)- FIFO (named pipe) special file
POSIX_S_IFREG(int)- Normal file
POSIX_S_IFSOCK(int)- Socket
