[wp-trac] [WordPress Trac] #28216: Allow to register pre-instantiated widgets

[WordPress Trac]

#28216: Allow to register pre-instantiated widgets
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 Reporter:  Denis-de-Bernardy  |       Owner:  westonruter
     Type:  defect (bug)       |      Status:  closed
 Priority:  normal             |   Milestone:  4.6
Component:  Widgets            |     Version:  3.9.1
 Severity:  normal             |  Resolution:  fixed
 Keywords:  has-patch commit   |     Focuses:
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Comment (by jdgrimes):

 Replying to [comment:20 westonruter]:
 > @PeterRKnight How fortunate that `spl_object_hash()` is available in PHP
 5.2! However, I see it is used in `_wp_filter_build_unique_id()` but has
 an alternate case for handling if the function is not defined. This
 worried me in that perhaps the function could be disabled in 5.2. But see
 [https://core.trac.wordpress.org/ticket/21267#comment:4 #21267]:
 >
 > > Since PHP 5.2 (the required version for WP is 5.2.4),
 {{{spl_object_hash}}} exists, which means the {{{else}}} statement and
 {{{function_exists()}}} check are completely useless in
 {{{_wp_filter_build_unique_id()}}}
 >
 > So I think we're safe.


 The reason that the `function_exists()` check is needed is that the SPL
 extension can be disabled prior to PHP 5.3.0. So in 5.2.0 it is on by
 default but [https://secure.php.net/manual/en/spl.installation.php prior
 to 5.3.0 it can be disabled]. In which case the functions that it provides
 wouldn't be available.

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Ticket URL: <https://core.trac.wordpress.org/ticket/28216#comment:24>
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