[wp-trac] [WordPress Trac] #50913: PHP 8.0: various compatibility fixes

[WordPress Trac]

#50913: PHP 8.0: various compatibility fixes
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 Reporter:  jrf                            |       Owner:  SergeyBiryukov
     Type:  task (blessed)                 |      Status:  reviewing
 Priority:  normal                         |   Milestone:  5.6
Component:  General                        |     Version:
 Severity:  normal                         |  Resolution:
 Keywords:  php8 has-patch needs-dev-note  |     Focuses:  coding-standards
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Comment (by SergeyBiryukov):

 Replying to [comment:61 jrf]:
 > The current test suite covers less than 40% of the WordPress Core code,
 so that still means that over 60% of the WordPress Core code is currently
 **''untested''** again PHP 8.0 and the PHP 8 compatibility status of the
 code is unknown.

 Right. As shared during the
 [https://wordpress.slack.com/archives/core/p1601496745406900 recent weekly
 dev chat], I think the next steps for PHP 8 support would be:
 * Updating the Docker image to use the same PHP extensions for PHP 8 that
 we have on PHP 7.x: `gd`, `mbstring`, etc. There is a PR by @desrosj
 waiting for review: https://github.com/WordPress/wpdev-docker-
 images/pull/36. If anyone is able to help with that, please do :)
 * Fixing some function argument type issues reported by PHPStan (a static
 analyzer): #51423.
 * More testing on PHP 8, expanding test coverage, and creating tickets for
 any issues found. @Andrei and @desrosj are working on a call for testing
 to be published later.

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Ticket URL: <https://core.trac.wordpress.org/ticket/50913#comment:65>
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