posix_access 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_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.