The `term_exists()` function expects a string or an integer for the `$term` parameter. It validates for integer, but not for string or `null`.
One of the pre-existing test cases, passed `null` to the function, leading to a `trim(): Passing null to parameter #1 ($string) of type string is deprecated` notice on PHP 8.1.
Fixed now by doing a cursory check on the variable at the start of the function and bowing out early in case the `$term` is `null`.
The issue was discovered via and is already covered by the `Tests_TermExists::test_term_exists_unknown()` test method.
Follow-up to [15220]. [38716].
Props jrf, hellofromTonya.
See #53635.
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As `term_id` is the actual property name of the `WP_Term`, it should appear first and we should make it more clear that `id` and `ID` are aliases.
Follow-up to [6254], [25334], [38677], [47865], [47870].
Props gazchap, audrasjb.
Fixes#54065.
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Previously, these properties could be unexpectedly converted to strings in some contexts.
This applies to the following functions:
* `sanitize_post_field()`
* `sanitize_term_field()`
* `sanitize_user_field()`
and the following properties:
* `WP_Post::ID`
* `WP_Post::post_parent`
* `WP_Post::menu_order`
* `WP_Term::term_id`
* `WP_Term::term_taxonomy_id`
* `WP_Term::parent`
* `WP_Term::count`
* `WP_Term::term_group`
* `WP_User::ID`
Props grantmkin, SergeyBiryukov.
Fixes#53235. See #52995.
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[48658] documented that various metadata functions return false for an invalid ID. However, that does not clarify what an invalid ID is: a non-numeric, zero, or negative value. This change adds the clarification in all relevant metadata function docblocks.
Props icopydoc, SergeyBiryukov, davidkryzaniak, audrasjb.
Fixes#51797.
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When deleting a term, it has to be removed individually from each object it's connected to, which can take some significant time when there are a lot of objects.
By calling `wp_remove_object_terms()` when no default term is required, we can skip the terms fetch/diff step and significantly speed up the deletion process.
Props dd32.
Fixes#52549.
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Replace the `WP_Taxonomy` object with the taxonomy slug in the values passed to the actions `edit_term_taxonomy` and `edited_term_taxonomy` within `wp_modify_term_count_by_now()`.
Follow up to [49141], [49171].
Props Chouby, lcyh78.
Fixes#40351.
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Using the canonical function name for PHP functions is strongly recommended, as aliases may be deprecated or removed without (much) warning.
This replaces all uses of the following:
* `join()` with `implode()`
* `sizeof()` with `count()`
* `is_writeable()` with `is_writable()`
* `doubleval()` with a `(float)` cast
In part, this is a follow-up to #47746.
Props jrf.
See #50767.
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When modifying terms assigned to an object, replace full term recounts with incrementing/decrementing the count as appropriate. This provides a significant performance boost on sites with a high number of term/object relationships and/or posts.
Introduces the functions `wp_increment_term_count()`, `wp_decrement_term_count()`, `wp_modify_term_count_by()` and `wp_modify_term_count_by_now()` for updating the term count.
Introduces the function `_wp_prevent_term_counting()` for preventing double counting on posts that are about to transition.
Adds the parameter `update_count_by_callback` to `register_taxonomy()` to allow developers to use a custom callback for incrementing or decrementing a term count.
Props boonebgorges, davidbaumwald, hellofromTonya, johnbillion, lcyh78, mattoperry, peterwilsoncc, rebasaurus, whyisjake.
Fixes#40351.
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PHP 8 changes the way string to number comparisons are performed: https://wiki.php.net/rfc/string_to_number_comparison
In particular, checking if a non-empty, non-numeric string is greater than zero in PHP 8 evaluates to `true`, not `false`.
For `wp_insert_term()`, this resulted in a "Parent term does not exist" error for a non-numeric string, instead of discarding the value.
By explicitly casting the value to `int`, we make sure to compare both values as numbers, rather than a string and a number.
Follow-up to [29196], [29830], [29867].
See #50913.
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This brings `wp_count_terms()` in line with other taxonomy functions such as `get_terms()` which technically no longer require a taxonomy. Similar to the previously modified functions, no deprecation warning is triggered when using the legacy signature.
Fixes#36399.
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* Move default term assignment from `wp_set_object_terms()` to `wp_insert_post()`.
* Make sure the passed taxonomy list overwrites the existing list if not empty.
* Remove the default term option on `unregister_taxonomy()`.
* Prevent deletion of the default term in `wp_delete_term()`.
Props enrico.sorcinelli, TimothyBlynJacobs.
See #43517.
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John Blackbourn
hellofromTonya
Sergey Biryukov
youknowriad
davidbaumwald
gziolo
antpb
Peter Wilson
Felix Arntz