[wp-trac] [WordPress Trac] #51699: The only correct method to check for existence of option

[WordPress Trac]

#51699: The only correct method to check for existence of option
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 Reporter:  ttodua              |       Owner:  (none)
     Type:  defect (bug)        |      Status:  reopened
 Priority:  normal              |   Milestone:  Awaiting Review
Component:  Options, Meta APIs  |     Version:
 Severity:  normal              |  Resolution:
 Keywords:                      |     Focuses:
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Changes (by apedog):

 * status:  closed => reopened
 * resolution:  invalid =>


Comment:

 I don't think this is an invalid ticket. I'd say an {{{option_exists()}}}
 function would be a valuable addition to the API. I know ''I'' searched
 for such a function quite often when I started with WordPress.

 @SergeyBiryukov's solution does work. But it's a workaround. It makes
 creative use of {{{get_option}}}'s optional parameter and results in non-
 human-readable code (it is not immidiately obvious what the code does).
 And it relies on the test string not being used as the value of the option
 (either intentionally or accidentally). ie. it's not foolproof 100% of the
 time.
 This is ok for most purposes, but it does not, ''strictly speaking'', test
 the database if the option exists.

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Ticket URL: <https://core.trac.wordpress.org/ticket/51699#comment:5>
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