Fixed bug #42560

Check open_basedir after the fallback to the system's temporary
directory in tempnam().

In order to preserve the current behavior of upload_tmp_dir
(do not

Fixed bug #42560

Check open_basedir after the fallback to the system's temporary
directory in tempnam().

In order to preserve the current behavior of upload_tmp_dir
(do not check explicitly specified dir, but check fallback),
new flags are added to check open_basedir for explicit dir
and for fallback.

Closes GH-6526.

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