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PHP Manual
Predefined Constants
posix_access constants

posix_access() constants

Note:
Please note that some of these constants may not be available on every system.

POSIX_F_OK (int): Check whether the file exists.
POSIX_R_OK (int): Check whether the file exists and has read permissions.
POSIX_W_OK (int): Check whether the file exists and has write permissions.
POSIX_X_OK (int): Check whether the file exists and has execute permissions.

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