Bug #81441 [Opn->Csd]: gethostbyaddr('::1') returns ip instead of name after calling some other method

Edit report at https://bugs.php.net/bug.php?id=81441&edit=1 ID: 81441 Updated by: git@php.net Reported by: stefan at buerk dot tech Summary: gethostbyaddr('::1') returns ip instead of name after calling some other method -Status: Open +Status: Closed Type: Bug Package: *Network Functions Operating System: alpine-3.13/alpine-3.14 docker PHP Version: 8.1.0RC1 Block user comment: N Private report: N New Comment: Automatic comment on behalf of nikic Revision: https://github.com/php/php-src/commit/425e70c11c29b313ab69e252329ef75f4f2c1a49 Log: Fix bug #81441 Previous Comments: ------------------------------------------------------------------------ [2021-11-03 22:17:25] stefan at buerk dot tech This issue still exists in official php alpine xxx 8.1 RC5 containers. ------------------------------------------------------------------------ [2021-10-26 13:44:33] cmb@php.net Relevant info from the (now closed) downstream issue: <https://github.com/docker-library/php/issues/1201#issuecomment-922939722>f. ------------------------------------------------------------------------ [2021-09-15 18:16:25] stefan at buerk dot tech Description: ------------ We have tried to use the alpine docker images for our ci builds to start getting 8.1 compatibility. We had a weired behaviour with using gethostbyaddr('::1') in unit tests. The first call is resolved to 'localhost', or better to say all calls until one other function where called. (Do not know if all, but we had different in between). For example the version_compare(), as this was the first function in phpunit .. which changed the behavior. Maybe it is not php, but we used the same dockerfile as verification, kust switchen php 8 with 8.1 RC1 and getting this weired behaviour. We opend an issue on github for the php docker containers holding a lot of test runs. https://github.com/docker-library/php/issues/1201 Test script: --------------- <?php echo "CHECK ::1 hostname before/after version compare" . PHP_EOL; // duplicationg this line bevore other code lines, would work until something // like version_compare is used. // EXPECTED: localhost echo "#1 IPv6(::1): " . (string)gethostbyaddr('::1') . PHP_EOL; // this line chanes the return in 8.1.0RC1-alpine - but why ? // but even other codelines changed it if (!version_compare(PHP_VERSION, PHP_VERSION, '=')) {} // EXPECTED: localhost => alpine ::1, others localhost as expected echo "#2 IPv6(::1): " . (string)gethostbyaddr('::1') . PHP_EOL; Expected result: ---------------- Getting always the resolved name from /etc/hosts on subsequent calls, even if other scripts are called: CHECK ::1 hostname before/after version compare #1 IPv6(::1): localhost #2 IPv6(::1): localhost Actual result: -------------- CHECK ::1 hostname before/after version compare #1 IPv6(::1): localhost #2 IPv6(::1): ::1 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=81441&edit=1