[wp-trac] [WordPress Trac] #34359: Cache output of `wp_upload_dir()` to improve performance

[WordPress Trac]

#34359: Cache output of `wp_upload_dir()` to improve performance
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 Reporter:  mikeschroder                   |       Owner:  azaozz
     Type:  defect (bug)                   |      Status:  assigned
 Priority:  normal                         |   Milestone:  4.5
Component:  Media                          |     Version:
 Severity:  normal                         |  Resolution:
 Keywords:  needs-testing has-patch early  |     Focuses:  multisite,
                                           |  performance
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Comment (by azaozz):

 In [changeset:"36565"]:
 {{{
 #!CommitTicketReference repository="" revision="36565"
 Improve the performance of `wp_upload_dir()`:
 - Cache the output in non-persistent cache.
 - Cache the result from `wp_mkdir_p()` in persistent cache (when present).
 - Introduce `wp_get_upload_dir()` for use when not uploading files. It is
 equivalent to `wp_upload_dir()` but does not check for the existence or
 create the upload directory.
 - Change tests to use the non-cached `_wp_upload_dir()`. They change
 options on the fly (should never be used in production) to simulate
 different environments.
 - Introduce `_upload_dir_no_subdir()` and `_upload_dir_https()` to
 facilitate testing. These use the proper `upload_dir` filter to simulate
 different environments.

 Props kovshenin, azaozz.
 See #34359.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/34359#comment:52>
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