[wp-trac] [WordPress Trac] #44123: Utilize `is_countable()` and `is_iterable()` Polyfills

[WordPress Trac]

#44123: Utilize `is_countable()` and `is_iterable()` Polyfills
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 Reporter:  desrosj           |      Owner:  (none)
     Type:  task (blessed)    |     Status:  new
 Priority:  normal            |  Milestone:  Awaiting Review
Component:  General           |    Version:
 Severity:  normal            |   Keywords:
  Focuses:  coding-standards  |
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 In 4.9.6, polyfills for `is_countable()` and `is_iterable()` were
 introduced (#43583 and #43619). These should be utilized in core for
 better variable validation and forwards compatibility.

 This is a meta ticket to track overall progress making replacements
 throughout core. Because there will be many instances and each requires
 validation, individual tickets should be opened for each replacement.

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Ticket URL: <https://core.trac.wordpress.org/ticket/44123>
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