[wp-trac] [WordPress Trac] #42961: Rest API doesnt handle empty arrays in querystring correctly

[WordPress Trac]

#42961: Rest API doesnt handle empty arrays in querystring correctly
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 Reporter:  steffanhalv   |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  REST API      |     Version:  4.7
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:  rest-api
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Changes (by dd32):

 * version:  4.9.1 => 4.7


Comment:

 This appears to be the correct behaviour, although an unexpected one at
 that.

 > Ex. Querystring:
 > mysite.com/wp-json/...?my_empty_array[]=&... <- This works not

 In PHP applications, `var[]=` is always treated as being set to an empty
 string, that means that this is interpreted as `array( '' )`.

 > JSON:
 > data: { my_empty_array: [] } <- This works

 When using JSON, you can pass more specific types than what you can in a
 PHP Query string, which results in this being a literal `array()`

 ----

 All that being said, this feels a little awkward, and I'd prefer to see it
 standardised on the JSON behaviour, but I'm not sure it's really possible
 though.

 One option would be to run `array_filter()` on any array items in the
 query string, but doing so also means moving away from standard PHP URL
 parsing quirks.

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Ticket URL: <https://core.trac.wordpress.org/ticket/42961#comment:1>
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