Previously, an value matching `empty()` would have been bypassed in favor of the default setting for 100MB.
Related #19538, r19639, r19652, where we saw the bug, fixed the bug, and then unfixed the bug so that it was not a surprise in a point release.
See #34037.
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As the number of multidimensional settings (serialized options and theme mods) increase for a given ID base (e.g. a widget of a certain type), the number of calls to the `multidimensional` methods on `WP_Customize_Setting` increase exponentially, and the time for the preview to refresh grows in time exponentially as well.
To improve performance, this change reduces the number of filters needed to preview the settings off of a multidimensional root from N to 1. This improves performance from `O(n^2)` to `O(n)`, but the linear increase is so low that the performance is essentially `O(1)` in comparison. This is achieved by introducing the concept of an "aggregated multidimensional" setting, where the root value of the multidimensional serialized setting value gets cached in a static array variable shared across all settings.
Also improves performance by only adding preview filters if there is actually a need to do so: there is no need to add a filter if there is an initial value and if there is no posted value for a given setting (if it is not dirty).
Fixes#32103.
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In all three cases, the functions can accept a post ID, a `WP_Post` object, or a falsey value, which defaults to the value of the global `$post`. Switching to `$post` in this context allows the parameters to better self-document and removes ambiguity in the code they are subsequently used in.
Props chriscct7 for the initial patch.
See #34234.
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A side effect of this change is that terms stored in the cache no longer have
an `object_id` associated with them. Previously, `object_id` had always been
cached when the term cache was populated via `wp_get_object_terms()`, a
strategy that was mostly harmless but still incorrect.
See #14162.
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`get_term()` now returns a `WP_Term` object, instead of a `stdClass` object.
Cache support and sanitization filters for individual terms are now more
centralized. For example, `get_term_by()` is able to cast results of its query
to a `WP_Term` object by passing it through `get_term()`.
The `$taxonomy` parameter for `get_term()` is now optional, as terms ought to
be unique to a taxonomy (ie, shared terms no longer exist). In cases where
`get_term()` detects that the term matching the specified term_id is from the
wrong taxonomy, it checks to see if you've requested a shared term, and if so,
it splits the term. This is used only for fallback purposes.
The elimination of shared terms allows the caching strategy for terms to be
simplified. Individual terms are now cached in a single 'terms' bucket.
Props flixos90, boonebgorges, scribu, dipesh.kakadiya.
See #14162.
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These H5 (heading level 5) don't allow for a good headings hierarchy and shouldn't be headings in the first place. Each group of options has now its own fieldset and legend.
In `render_screen_options()`, introduce two new "render" methods: `render_meta_boxes_preferences()` and `render_list_table_columns_preferences()` for consistency with already existing render methods and cleaner code.
Props joedolson, afercia.
Fixes#33646.
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The 'do not' is converted to "don't" because "you" is third-person plural, and 'does not' is converted to "doesn't" because `localhost` is third-person singular. While both are "negative" contractions, we often write this way in WordPress to provide a friendlier tone. That's your English grammar lesson for the day.
Props ankit-k-gupta, iamfriendly.
Fixes#30317.
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`random_compat` offers a set of compatible functions for older versions of PHP, filling in the gap by using other PHP extensions when available.
We still include our existing `wp_rand()` functionality as a fallback for when no proper CSPRNG exists on the system.
Take Two, this was previously committed in [34922] but had an issue on PHP 5.2 which sarciszewski has now resolved.
Props sarciszewski
See #28633
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