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/wp-includes/ -> category.php (summary)

Taxonomy API: Core category-specific functionality

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Defines 13 functions

  get_categories()
  get_category()
  get_category_by_path()
  get_category_by_slug()
  get_cat_ID()
  get_cat_name()
  cat_is_ancestor_of()
  sanitize_category()
  sanitize_category_field()
  get_tags()
  get_tag()
  clean_category_cache()
  _make_cat_compat()

Functions
Functions that are not part of a class:

get_categories( $args = '' )   X-Ref
Retrieves a list of category objects.

If you set the 'taxonomy' argument to 'link_category', the link categories
will be returned instead.

param: string|array $args {
return: array List of category objects.
since: 2.1.0

get_category( $category, $output = OBJECT, $filter = 'raw' )   X-Ref
Retrieves category data given a category ID or category object.

If you pass the $category parameter an object, which is assumed to be the
category row object retrieved the database. It will cache the category data.

If you pass $category an integer of the category ID, then that category will
be retrieved from the database, if it isn't already cached, and pass it back.

If you look at get_term(), then both types will be passed through several
filters and finally sanitized based on the $filter parameter value.

param: int|object $category Category ID or category row object.
param: string     $output   Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
param: string     $filter   Optional. How to sanitize category fields. Default 'raw'.
return: object|array|WP_Error|null Category data in type defined by $output parameter.
since: 1.5.1

get_category_by_path( $category_path, $full_match = true, $output = OBJECT )   X-Ref
Retrieves a category based on URL containing the category slug.

Breaks the $category_path parameter up to get the category slug.

Tries to find the child path and will return it. If it doesn't find a
match, then it will return the first category matching slug, if $full_match,
is set to false. If it does not, then it will return null.

It is also possible that it will return a WP_Error object on failure. Check
for it when using this function.

param: string $category_path URL containing category slugs.
param: bool   $full_match    Optional. Whether full path should be matched.
param: string $output        Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
return: WP_Term|array|WP_Error|null Type is based on $output value.
since: 2.1.0

get_category_by_slug( $slug )   X-Ref
Retrieves a category object by category slug.

param: string $slug The category slug.
return: object|false Category data object on success, false if not found.
since: 2.3.0

get_cat_ID( $cat_name )   X-Ref
Retrieves the ID of a category from its name.

param: string $cat_name Category name.
return: int Category ID on success, 0 if the category doesn't exist.
since: 1.0.0

get_cat_name( $cat_id )   X-Ref
Retrieves the name of a category from its ID.

param: int $cat_id Category ID.
return: string Category name, or an empty string if the category doesn't exist.
since: 1.0.0

cat_is_ancestor_of( $cat1, $cat2 )   X-Ref
Checks if a category is an ancestor of another category.

You can use either an ID or the category object for both parameters.
If you use an integer, the category will be retrieved.

param: int|object $cat1 ID or object to check if this is the parent category.
param: int|object $cat2 The child category.
return: bool Whether $cat2 is child of $cat1.
since: 2.1.0

sanitize_category( $category, $context = 'display' )   X-Ref
Sanitizes category data based on context.

param: object|array $category Category data.
param: string       $context  Optional. Default 'display'.
return: object|array Same type as $category with sanitized data for safe use.
since: 2.3.0

sanitize_category_field( $field, $value, $cat_id, $context )   X-Ref
Sanitizes data in single category key field.

param: string $field   Category key to sanitize.
param: mixed  $value   Category value to sanitize.
param: int    $cat_id  Category ID.
param: string $context What filter to use, 'raw', 'display', etc.
return: mixed Same type as $value after $value has been sanitized.
since: 2.3.0

get_tags( $args = '' )   X-Ref
Retrieves all post tags.

param: string|array $args {
return: WP_Term[]|int|WP_Error Array of 'post_tag' term objects, a count thereof,
since: 2.3.0

get_tag( $tag, $output = OBJECT, $filter = 'raw' )   X-Ref
Retrieves a post tag by tag ID or tag object.

If you pass the $tag parameter an object, which is assumed to be the tag row
object retrieved from the database, it will cache the tag data.

If you pass $tag an integer of the tag ID, then that tag will be retrieved
from the database, if it isn't already cached, and passed back.

If you look at get_term(), both types will be passed through several filters
and finally sanitized based on the $filter parameter value.

param: int|WP_Term|object $tag    A tag ID or object.
param: string             $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
param: string             $filter Optional. How to sanitize tag fields. Default 'raw'.
return: WP_Term|array|WP_Error|null Tag data in type defined by $output parameter.
since: 2.3.0

clean_category_cache( $id )   X-Ref
Removes the category cache data based on ID.

param: int $id Category ID
since: 2.1.0

_make_cat_compat( &$category )   X-Ref
Updates category structure to old pre-2.3 from new taxonomy structure.

This function was added for the taxonomy support to update the new category
structure with the old category one. This will maintain compatibility with
plugins and themes which depend on the old key or property names.

The parameter should only be passed a variable and not create the array or
object inline to the parameter. The reason for this is that parameter is
passed by reference and PHP will fail unless it has the variable.

There is no return value, because everything is updated on the variable you
pass to it. This is one of the features with using pass by reference in PHP.

param: array|object|WP_Term $category Category row object or array.
since: 2.3.0
since: 4.4.0 The `$category` parameter now also accepts a WP_Term object.



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