Taxonomies in WordPress are use to organize content like blog entries, pages, and CPTs. Taxonomies may be hierarchical (like categories) or flat (like tags). A taxonomy term’s ID may be use for various purposes, so such as presenting a list of articles tagged with that term.
This piece will outline the steps necessary to get the current taxonomy word ID in WordPress when you hire WordPress expert. This may be done in several ways, because some more appropriate than others, depending on the circumstances and taxonomy.
Fetching the current term ID in a single post or page
The `get_the_terms()` method may be use inside a single post or page to get the current WordPress taxonomy term ID. This method produces an array containing all post/page terms, from which you may get the individual term IDs.
Here is an example:
$terms = get_the_terms( get_the_ID(), ‘taxonomy_name’ );
if ( $terms && ! is_wp_error( $terms ) ) {
foreach ( $terms as $term ) {
$term_id = $term->term_id;
// do something with the term ID
}
}
The function `get_the_ID()` obtains the ID of the current post or page; to receive the ID of a term from a taxonomy, substitute `’taxonomy_name” with the name of the taxonomy. If the seat or page has many times connected with it, the function will go over the array and get the term ID for each term.
Fetching the current term ID on a taxonomy archive page
Taxonomy archive pages, such as category and tag pages, provide the `get_queried_object()` method, which may be use to get the current taxonomy term ID. For this scenario, the term object is being request, and this function will return that object.
Here is an example:
$term = get_queried_object();
if ( $term ) {
$term_id = $term->term_id;
// do something with the term ID
}
The preceding code obtains the presently queried object, which should be a term object on a taxonomy archive page, as that is what `get_queried_object()` refers to. Then, you can get the term ID from the object by using `$term->term_id`.
Fetching the current term ID in a custom taxonomy template
The `get_queried_object()` method may also be use with a custom taxonomy template; however, the taxonomy name must be provided as an argument.
Here is an example:
$taxonomy = get_query_var( ‘taxonomy’ );
$term = get_queried_object();
if ( $term ) {
$term_id = $term->term_id;
// do something with the term ID
}
The preceding code obtains the name of the custom taxonomy being search using the `get_query_var(‘taxonomy’)` function, and the term object is obtain using the `get_queried_object()` function. The object’s term ID may be retrieve with the help of the `$term->term_id method.`
Fetching the current term ID in a widget.
The widget’s `get_queried_object_id()` method may be use to get the current taxonomy term ID for usage in a device like a custom menu or a recent posts widget. Whether the item requested is a post, a page, and a term, this function will return its unique identifier.
Here is an example:
$term_id = get_queried_object_id();
// do something with the term ID
If the widget is being shown on a term archive page, and the ID of the presently query object will be a term ID, as seen in the code above using the function `get_queried_object_id()`.
Fetching the current term ID in a custom query
Using the `get_term_by()` method, you may obtain the term object and then extract the term ID in a custom query to fetch articles based on a given term.
Here is an example:
$term = get_term_by( ‘slug’, ‘term-slug’, ‘taxonomy_name’ );
if ( $term ) {
$term_id = $term->term_id;
// do something with the term ID
}
The preceding code uses the term’s slug and taxonomy name to obtain the term object using the `get_term_by()` function. The object’s term ID may be retrieve with the help of the `$term->term_id` method.
Fetching the current term ID in a plugin or theme
When creating a WordPress plugin or WordPress theme, and you may use the techniques above to get the active taxonomy’s term ID, depending on the situation’s specifics and the taxonomy in question.
You may also use the `is_tax()` method with the `get_queried_object()` function to determine whether the current page is a taxonomy archive page.
Here is an example:
if ( is_tax( ‘taxonomy_name’ ) ) {
$term = get_queried_object();
if ( $term ) {
$term_id = $term->term_id;
// do something with the term ID
}
}
In the preceding code, `is_tax(‘taxonomy_name’)` determines whether or not the current page is a taxonomy archive page for the given taxonomy. If so, the program gets the term object from the database using `get_queried_object()` and then receives the term ID from the object.
Using the global $wp_query variable
Alternatively, you may utilize the `$wp_query` global variable to get the current taxonomy term ID. The taxonomy word ID will also be store in this variable if the current page is a taxonomy archive page.
Here is an example:
global $wp_query;
if ( isset( $wp_query->queried_object_id ) ) {
$term_id = $wp_query->queried_object_id;
// do something with the term ID
}
The preceding code verifies that the current page is a taxonomy archive page by checking whether the `$wp_query->queried_object_id` variable is set. If so, we do the next step specified by the variable’s term ID.
Using the get_query_var() function
The `get_query_var()` function is an alternative method to get the current taxonomy term ID. The term ID for a taxonomy archive page may be found by using this function to obtain the value of a query variable in the current query.
Here is an example:
$term_id = get_query_var( ‘term_id’ );
if ( $term_id ) {
// do something with the term ID
}
The preceding code uses the `get_query_var()` method to get the `term_id` variable’s value. If the flag is present, we get the term ID and take the appropriate action.
Using the WP_Term_Query class
The `WP_Term_Query` class helps retrieve several taxonomy terms according to criteria. Using this class, you may query words from several taxonomies based on various criteria, including term IDs, slugs, names, parent IDs, and more.
Here is an example:
$args = array(
‘taxonomy’ => ‘taxonomy_name’,
‘term_id’ => array( 1, 2, 3 ),
);
$terms = new WP_Term_Query( $args );
if ( ! empty( $terms->terms ) ) {
foreach ( $terms->terms as $term ) {
$term_id = $term->term_id;
// do something with the term ID
}
}
The preceding code retrieves terms with IDs 1, 2, and 3 from the designated taxonomy using the `WP_Term_Query` class. So once the words have been generate, then we iterate through them to get the term ID.
Using the get_term_children() function
The `get_term_children()` method may be use to acquire the term ID of all child terms of a specify parent term. This method gets an array containing the term IDs of all the children of the given parent term.
Here is an example:
$parent_term_id = 5;
$child_term_ids = get_term_children( $parent_term_id, ‘taxonomy_name’ );
if ( ! empty( $child_term_ids ) ) {
foreach ( $child_term_ids as $term_id ) {
// do something with the term ID
}
}
The preceding code uses `get_term_children()` to get a list of all the taxonomy terms that are children of the period with ID 5. The generate term IDs are iterate, and the necessary operation is carry out each time.
Using the wp_get_post_terms() function
The `wp_get_post_terms()` method may be use to acquire the ID(s) of the terms attached to a given post. Invoking this method with a post ID and taxonomy will return an array of term objects or IDs for that post.
Here is an example:
$post_id = 123;
$taxonomy = ‘taxonomy_name’;
$terms = wp_get_post_terms( $post_id, $taxonomy );
if ( ! empty( $terms ) ) {
foreach ( $terms as $term ) {
$term_id = $term->term_id;
// do something with the term ID
}
}
Above, we utilize the `wp_get_post_terms()` function to get a list of all the taxonomy keywords that apply to the post with ID 123. The generate term objects are iterate through, and the term IDs are retrieve individually.
Using the get_terms() function
The `get_terms()` method is helpful if you need to obtain a set of terms that meet specific requirements. For a given set of inputs, this method returns an array containing term objects or IDs for all words in the supplied taxonomy that satisfy those criteria.
Here is an example:
$args = array(
‘taxonomy’ => ‘taxonomy_name’,
‘parent’ => 0,
);
$terms = get_terms( $args );
if ( ! empty( $terms ) ) {
foreach ( $terms as $term ) {
$term_id = $term->term_id;
// do something with the term ID
}
}
The `get_terms()` function in the above code is use to get an array of term objects for all root words in the taxonomy. The generate term objects are iterate through, and the term IDs are retrieve individually.
Using the get_queried_object_id() function
The `get_queried_object_id()` method may be use to acquire the ID of the currently-viewed word on a taxonomy archive page. Depending on the context, and this method will obtain the ID of the presently searched object, which might be a term, a post, a user, or a comment.
Here is an example:
$term_id = get_queried_object_id();
if ( $term_id ) {
// do something with the term ID
}
To acquire the ID of the selected term when viewing the taxonomy archive page, and we utilize the `get_queried_object_id()` function, as shown above. With the generated term ID, we carry out the specified operation.
Using the is_tax() function
The `is_tax()` method may determine whether the currently viewed page is a taxonomy archive page. If the current page is a taxonomy archive page and the given taxonomy is the same as the one being browse, this method will return true.
Here is an example:
if ( is_tax( ‘taxonomy_name’ ) ) {
// do something
}
The function `is_tax()` above determines whether the current page is an archive page for the taxonomy. To trigger the execution of the code block, the current page must be a taxonomy archive page for the given taxonomy.
Using the WP_Term_Query class
The WP_Term_Query class may obtain a set of terms matching a given query. This class provides a framework for constructing complicated queries that retrieve words from a given taxonomy that meet specific criteria.
Here is an example:
$args = array(
‘taxonomy’ => ‘taxonomy_name’,
‘parent’ => 0,
);
$query = new WP_Term_Query( $args );
if ( ! empty( $query->terms ) ) {
foreach ( $query->terms as $term ) {
$term_id = $term->term_id;
// do something with the term ID
}
}
The preceding code utilizes `WP_Term_Query` to get a list of term objects for all root words in the selected taxonomy. It was generate term objects are iterated through, and the term IDs are retrieve individually.
Conclusion
When dealing with taxonomies in WordPress, one typical activity is retrieving the current taxonomy word ID. The WordPress term ID can be retrieve, and related tasks like retrieving children of a term, fetching terms associated with a specific post, and querying terms based on specific criteria can be carry out by employing the methods and techniques we’ve discus, such as the use of the `get_queried_object()` function, the `WP_Term_Query` class, and the `get_terms()` function.
Considerations such as the nature of the problem at hand, the complexity of the query, and the data you need to extract or change will inform your choice of methodology. To deal with taxonomies in WordPress plugin development services more quickly and successfully, it is helpful to get acquaint with these various approaches and choose the one most fit for your purposes.
