[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:  (none)
     Type:  enhancement               |      Status:  new
 Priority:  normal                    |   Milestone:  4.9.6
Component:  General                   |     Version:
 Severity:  normal                    |  Resolution:
 Keywords:  has-patch has-unit-tests  |     Focuses:
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Comment (by desrosj):

 This is looking good to me. I made a few adjustments in
 [attachment:43583.patch]:

 - Combined the two patches above into one patch.
 - Switched to brackets instead of the alternative syntax.
 - Added `@since` tag to the inline documentation.
 - Added the `@ticket` tag to the unit test inline documentation.
 - Changed booleans in the documentation to lowercase to match core.

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Ticket URL: <https://core.trac.wordpress.org/ticket/43583#comment:8>
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