The is_object_in_term() WordPress PHP function determines if the given object is associated with any of the given terms.
Usage
is_object_in_term( $object_id, $taxonomy, $terms )
Example:
Input: is_object_in_term( 42, 'genre', 'mystery' )
Output: true if post with ID 42 is in the ‘mystery’ genre, false otherwise.
Parameters
$object_id(int): ID of the object (post ID, link ID, etc.).$taxonomy(string): Single taxonomy name.$terms(int|string|int[]|string[], optional): Term ID, name, slug, or array of such to check against. Default: null.
More information
See WordPress Developer Resources: is_object_in_term
Examples
Check if a post is in a specific category
This code snippet checks if the current post is in the ‘News’ category and displays a message accordingly.
if ( is_object_in_term( $post->ID, 'category', 'News' ) ) {
echo 'This post is in the News category.';
} else {
echo 'This post is not in the News category.';
}
Check if a post has any tags
This example checks if the current post has any tags.
if ( is_object_in_term( $post->ID, 'post_tag' ) ) {
echo 'This post has tags.';
} else {
echo 'This post has no tags.';
}
Check if a post is in multiple terms
This code snippet checks if the current post is in the ‘Fiction’ or ‘Non-fiction’ genres.
if ( is_object_in_term( $post->ID, 'genre', array( 'Fiction', 'Non-fiction' ) ) ) {
echo 'This post is either in the Fiction or Non-fiction genre.';
} else {
echo 'This post is not in the Fiction or Non-fiction genre.';
}
Check if a custom post type is in a specific term
This example checks if a custom post type with ID 123 is in the ‘Science’ term of the ‘subject’ taxonomy.
if ( is_object_in_term( 123, 'subject', 'Science' ) ) {
echo 'This custom post is in the Science subject.';
} else {
echo 'This custom post is not in the Science subject.';
}
Check if a post is in a term by slug
This code snippet checks if the current post is in the term with the slug ‘breaking-news’.
if ( is_object_in_term( $post->ID, 'category', 'breaking-news' ) ) {
echo 'This post is in the Breaking News category.';
} else {
echo 'This post is not in the Breaking News category.';
}