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.
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