[wp-trac] [WordPress Trac] #44416: `compact()` will throw notice for undefined variables in PHP 7.3

[WordPress Trac]

#44416: `compact()` will throw notice for undefined variables in PHP 7.3
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 Reporter:  desrosj       |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Future Release
Component:  General       |    Version:
 Severity:  normal        |   Keywords:  needs-patch
  Focuses:                |
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 PHP 7.3 has been released [http://php.net/archive/2018.php#id2018-06-07-1
 Alpha 1]. While this is still an early development version, one of the
 [https://wiki.php.net/rfc/compact accepted] and [https://github.com/php
 /php-src/pull/3240 committed] changes is exposing some undefined
 variables.

 In PHP 7.3, the `compact()` function has been changed to issue an
 `E_NOTICE` level error if a passed string refers to an unset variable. In
 previous versions of PHP, this notice was silently skipped. The full RFC
 can be viewed here: https://wiki.php.net/rfc/compact

 While it may be early to fix PHP 7.3 compatibility issues, this one
 exposes variables that are potentially being handled incorrectly and
 should be investigated.

 The main offenders appear to be:

 - `wp_insert_post()`
 - `wp_xmlrpc_server->mw_newPost();`
 - `WP_Comment_Query->get_comment_ids()`

 To see the warnings thrown, [https://travis-ci.org/WordPress/wordpress-
 develop/jobs/394396151 look at the nightly PHP job on any recent build for
 `master`]

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Ticket URL: <https://core.trac.wordpress.org/ticket/44416>
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