The `WP_INSTALLING` constant is a flag that WordPress sets in a number of
places, telling the system that options should be fetched directly from the
database instead of from the cache, that WP should not ping wordpress.org for
updates, that the normal "not installed" checks should be bypassed, and so on.
A constant is generally necessary for this purpose, because the flag is
typically set before the WP bootstrap, meaning that WP functions are not yet
available. However, it is possible - notably, during `wpmu_create_blog()` -
for the "installing" flag to be set after WP has already loaded. In these
cases, `WP_INSTALLING` would be set for the remainder of the process, since
there's no way to change a constant once it's defined. This, in turn, polluted
later function calls that ought to have been outside the scope of site
creation, particularly the non-caching of option data. The problem was
particularly evident in the case of the automated tests, where `WP_INSTALLING`
was set the first time a site was created, and remained set for the rest of the
suite.
The new `wp_installing()` function allows developers to fetch the current
installation status (when called without any arguments) or to set the
installation status (when called with a boolean `true` or `false`). Use of
the `WP_INSTALLING` constant is still supported; `wp_installing()` will default
to `true` if the constant is defined during the bootstrap.
Props boonebgorges, jeremyfelt.
See #31130.
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The call to `flock()` is an exclusive advisory lock, which in my testing only PHP respects (apache continues to read it).
Not all filesystems support locking (remote NFS mounts for example) so this offers minimal benefit to those platforms, but offers much better protection against file corruption on systems which do support it.
The call is blocking, so a second process will wait for the first to complete before writing if supported.
See #31767
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`admin-filters.php`
`ms-admin-filters.php`
There are random actions and filters littered among files like `misc.php`. These files contain functions that won't work outside of admin context and are typically only loaded in files that have already loaded the admin bootstrap.
See #32529.
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These no longer return upon refreshing the page when JS is on and working, so users should be able to dismiss them. This is particularly important on the post edit screen when DFW is triggered, but pretty much all notices can be dismissed if needed. A post on Make/Core will follow with information on how this can be leveraged in plugins.
props valendesigns, afercia, paulwilde, adamsilverstein, helen.
fixes#31233. see #23367.
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* Update about page, there's now 8.
* Display them four wide, not three, and ensure adequate spacing.
* Use a dedicated nonce.
* Push Light to the front in addition to Default.
* Use user-profile.js on about.php. A few extra things are initialized but they are harmless.
see #26468, #26387.
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Both of these icons can be colored to match the color scheme, including hover states.
Both are accepted for register_post_type()'s menu_icon argument, and also add_menu_page()'s $icon_url argument.
To use a Dashicon, pass the name of the helper class, e.g. 'dashicons-piechart'.
To use an SVG, pass a valid data URI string starting with 'data:image/svg+xml;base64,'.
props helen.
fixes#25147.
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Color scheme selection on your own profile page gives you a preview and autosaves the selection.
Also introduces the usage of a preprocessor for core files, namely Sass. For 3.8, we will not expand its implementation past the color schemes. This does require Ruby as well as Sass 3.3.0+ due to the usage of the sourcemap option.
Note that only the default color scheme is available when running out of src. Use build to test the rest as well as the color picker.
props ryelle, melchoyce, tillkruess, drw158, littlethingsstudio, helen. see #25858, #22862.
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Introduces got_url_rewrite() and a corresponding filter, which should now be used in lieu of the got_rewrite filter in got_mod_rewrite().
This does not write or even suggest nginx configuration; rather, it prevents nginx from being considered as either Apache or as an unrecognized server.
props johnbillion.
fixes#25098.
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- Update the heartbeat nonce when refreshing nonces on the Edit Post screen.
- After a user logs in from the auth-check dialog, speed up heatrbeat to check/refresh nonces on the Edit Post screen.
- Speeding up heartbeat: bring back the setting how long it should last (how many ticks).
- Add 'heartbeat-nonces-expired' jQuery event when nonces have expired and the user is logged in.
See #23295, see #23216.
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- When a post is locked, ensure the 'Go back' button doesn't reload the same screen. If no referrer, change the button from 'Go back' to 'Go to All Posts'/'Go to All Pages' etc.
- Remove restriction on checking locks only for posts.
See #23697.
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