[wp-trac] [WordPress Trac] #33413: most PHP classes should be in their own file

[WordPress Trac]

#33413: most PHP classes should be in their own file
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 Reporter:  wonderboymusic  |       Owner:  wonderboymusic
     Type:  enhancement     |      Status:  assigned
 Priority:  normal          |   Milestone:  4.4
Component:  General         |     Version:  trunk
 Severity:  normal          |  Resolution:
 Keywords:  dev-feedback    |     Focuses:
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Comment (by DrewAPicture):

 Replying to [comment:59 westonruter]:
 > If you search GitHub across all repos, you'll see many examples of this
 (though many are just clones of Core): https://github.com/search?l=php&q
 =class-wp-customize-manager.php&type=Code
 >
 > I suppose it is acceptable to break plugin unit tests with this re-
 organization if this is all that breaks… but, loading other class files is
 not limited to unit tests. I see [https://github.com/search?l=php&q=class-
 wp-customize-control.php&ref=searchresults&type=Code&utf8=%E2%9C%93
 examples] of directly loading the control class file `require_once(
 ABSPATH . WPINC . '/class-wp-customize-control.php' )`:
 >
 > *
 https://github.com/nathancorbier/condemnationlaw/blob/631af9ba9a9cf9b2b09c58e3c9ead930081b55a4
 /wp-content/themes/stacy/includes/class-fonts-customizer.php#L2
 > * https://github.com/xwp/wp-settings-
 revisions/blob/231ba0ff2991d15980c9ec34c180f20b26dea489/php/meta-
 control.php#L3
 > * https://github.com/engrnvd/Wordpress-
 Sandbox/blob/ac31a58db97df411b3dc3b698ad80379907bb93b/wp-content/themes
 /dw-fixel/inc/class-customization.php#L2
 >
 > These plugins would all break.

 What if we introduced the new file and loaded it from the old one for
 back-compat, meanwhile tossing a `_deprecated_file()` notice, then delete
 the old file a few releases down the road, giving time for devs to update?

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Ticket URL: <https://core.trac.wordpress.org/ticket/33413#comment:60>
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