[wp-trac] [WordPress Trac] #34659: Whitelist for validation functions which only accept one argument

[WordPress Trac]

#34659: Whitelist for validation functions which only accept one argument
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 Reporter:  danielbachhuber                     |       Owner:  rmccue
     Type:  defect (bug)                        |      Status:  assigned
 Priority:  normal                              |   Milestone:  Future
Component:  REST API                            |  Release
 Severity:  normal                              |     Version:
 Keywords:  has-patch has-unit-tests 4.5-early  |  Resolution:
                                                |     Focuses:
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Comment (by brianhogg):

 Since we can't go back on having validate_callback and sanitize_callback
 functions being passed 3 parameters without breaking things for those that
 are using them, whitelisting core WP and PHP functions that either return
 a different value then when passed just the argument value or throws a
 warning seems like the only reasonable approach.  Functions like
 strip_tags also return NULL when passed 3 parameters.

 The only alternative I see is doing some kind of reflection to only pass
 in the number of parameters a function accepts, which would likely cause
 performance issues and be unnecessary (and undesired) for functions that
 dynamically fetch arguments.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34659#comment:17>
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