[wp-trac] [WordPress Trac] #60470: Use `filter_input` instead of superglobals where possible

[WordPress Trac]

#60470: Use `filter_input` instead of superglobals where possible
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 Reporter:  kkmuffme     |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Security     |    Version:
 Severity:  normal       |   Keywords:
  Focuses:               |
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 The `$_SERVER`, `$_GET`, and `$_POST` variables are inherently unsafe and
 shouldn't be used, as they can be modified in userland.

 `filter_input` should be used instead - for cases where there is no
 appropriate sanitizing available the FILTER_CALLBACK flag can be used with
 the WP sanitizing function, e.g. FILTER_CALLBACK

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Ticket URL: <https://core.trac.wordpress.org/ticket/60470>
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