预定义常量

下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。

POSIX_F_OK (integer)

Check whether the file exists.

POSIX_R_OK (integer)

Check whether the file exists and has read permissions.

POSIX_W_OK (integer)

Check whether the file exists and has write permissions.

POSIX_X_OK (integer)

Check whether the file exists and has execute permissions.

POSIX_S_IFBLK (integer)

Block special file

POSIX_S_IFCHR (integer)

Character special file

POSIX_S_IFIFO (integer)

FIFO (named pipe) special file

POSIX_S_IFREG (integer)

Normal file

POSIX_S_IFSOCK (integer)

Socket

Note:

These constants are available since PHP 5.1.0. Please also note that some of them may not be available in your system.