Previously, pg_select did not allow unconditional selection, where an
empty ids array would result in a function failure.
This patch implements two changes:
- Make the ids array an optional parameter.
- Allow the ids array to be empty.
In both cases, unconditional selection happen, which is equivalent to
pg_query('SELECT * FROM <table>;').
Two test cases were added to test the aforementioned changes.
Close GH-5332
The DB connection should be provided in all cases as the first argument.
The overloaded function signatures will be removed in the future.
Warn about this change.
Part of https://wiki.php.net/rfc/deprecations_php_8_1.
