[wp-trac] [WordPress Trac] #39053: Add function `wp_validate_integer`

[WordPress Trac]

#39053: Add function `wp_validate_integer`
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 Reporter:  peterwilsoncc  |      Owner:
     Type:  enhancement    |     Status:  new
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  General        |    Version:
 Severity:  normal         |   Keywords:  has-patch has-unit-tests
  Focuses:                 |
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 WordPress validates integers in a number of locations, each time using
 specific code:

 * `WP_Post::get_instance()`
 * `*_metadata_by_mid()`

 As `filter_var` is not available in all installations, let's add an
 equivalent: `wp_validate_integer()`.

 Patch incoming.

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Ticket URL: <https://core.trac.wordpress.org/ticket/39053>
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