posix_access constants

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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.