[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:  4.9.7
Component:  General         |     Version:
 Severity:  normal          |  Resolution:
 Keywords:  needs-patch     |     Focuses:
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Comment (by ianbelanger):

 Added is_countable() to /wp-admin/custom-header.php file, ticket #44124

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Ticket URL: <https://core.trac.wordpress.org/ticket/44123#comment:4>
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