The get_the_category_by_ID() WordPress PHP function retrieves the category name based on the given category ID.
Usage
To use the function, simply provide the category ID as the input:
echo get_the_category_by_ID( $category_id );
Parameters
$cat_id (int)– Required. The category ID for which the name is to be retrieved.
More information
See WordPress Developer Resources: get_the_category_by_ID
Examples
Display the Category Name by ID
This example displays the category name for the given category ID.
$category_id = 3; $category_name = get_the_category_by_ID($category_id); echo 'Category Name: ' . $category_name;
Display Post Categories
This example fetches and displays the categories of a post.
// Get post categories
$post_categories = get_the_category();
// Loop through post categories and display their names
foreach ($post_categories as $category) {
$category_name = get_the_category_by_ID($category->term_id);
echo 'Category Name: ' . $category_name . '<br>';
}
Add Category Name as CSS Class
This example adds the category name as a CSS class to an HTML element.
$category_id = 5; $category_name = get_the_category_by_ID($category_id); echo '<div class="category-' . $category_name . '">Content goes here</div>';
Display Category Name in a List
This example displays a list of category names using their IDs.
$category_ids = array(1, 2, 3, 4, 5);
echo '<ul>';
foreach ($category_ids as $category_id) {
$category_name = get_the_category_by_ID($category_id);
echo '<li>' . $category_name . '</li>';
}
echo '</ul>';
Show a Custom Message for a Specific Category
This example shows a custom message only for a specific category by checking its ID.
$post_categories = get_the_category();
$special_category_id = 7;
foreach ($post_categories as $category) {
if ($category->term_id == $special_category_id) {
$category_name = get_the_category_by_ID($special_category_id);
echo 'This post belongs to the ' . $category_name . ' category!';
break;
}
}