[wp-trac] [WordPress Trac] #43583: Introduce new PHP cross-version compat function `is_countable()`

[WordPress Trac]

#43583: Introduce new PHP cross-version compat function `is_countable()`
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 Reporter:  jrf                                  |       Owner:
                                                 |  SergeyBiryukov
     Type:  enhancement                          |      Status:  closed
 Priority:  normal                               |   Milestone:  4.9.6
Component:  General                              |     Version:
 Severity:  normal                               |  Resolution:  fixed
 Keywords:  php73 has-patch has-unit-tests       |     Focuses:
  needs-dev-note commit                          |
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Comment (by johnjamesjacoby):

 Cross-commenting from #43619…

 Motion to reopen for future discussion.

 Should we backport those to earlier WordPress versions?

 I can think of plugins that would like to be PHP7.3 ready without the need
 to bump their minimum WordPress version to 4.9.6. (I know a few issues
 were fixed in core, and I’d argue we should backport those also.)

 Without backporting these in core, plugins need to implement their own
 back-fills until they’re ready to bump their minimum version, defeating
 the purpose of the core back-fills for everything but core.

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Ticket URL: <https://core.trac.wordpress.org/ticket/43583#comment:38>
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