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Make MediaWiki 1.27 (LTS) compatible with PHP 7.1
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Currently 1.27 is compatible with 5.5-7.0. Security support for those will end on 31 Dec 2018 (5.6). 1.27 is supported until June 2019. It would be good to have 1.27 support 7.1 so there's an actual supported PHP version that can be used with it.

Main things needing backporting would be (I think):

Event Timeline

Change 374100 had a related patch set uploaded (by Reedy; owner: Reedy):
[mediawiki/core@REL1_27] RELEASE-NOTES for PHP 7.1 backports

Probably worth a sanity check for any PHP 7 fixes/tasks that didn't make it into REL1_27 already

[21:09:39] <wikibugs_> (PS1) Legoktm: Don't pass $this by reference [skins/Vector] - (
[21:11:20] <wikibugs_> (PS1) Legoktm: Don't pass $this by reference [skins/MonoBook] - (

Change 374100 merged by jenkins-bot:
[mediawiki/core@REL1_27] RELEASE-NOTES for PHP 7.1 backports

demon triaged this task as Medium priority.Jan 12 2018, 10:58 PM
Legoktm claimed this task.

Closing, because all 7.1 compat fixes in master were backported. If there are any other 7.1 incompatibilities, they can be tracked separately,