The is_term() WordPress PHP function checks if a term exists within a specified taxonomy and under a specified parent term.
Usage
is_term( $term, $taxonomy, $parent );
Parameters
- $term (int|string) (Required): The term to check.
- $taxonomy (string) (Optional): The taxonomy name to use. Default: ”.
- $parent (int) (Required): ID of the parent term under which to confine the exists search.
More information
See WordPress Developer Resources: is_term()
Examples
Check if a term exists in a category
// Check if the term "travel" exists in the "category" taxonomy
$term_exists = is_term('travel', 'category');
Check if a term exists with a specific ID
// Check if a term with the ID 42 exists $term_exists = is_term(42);
Check if a term exists in a custom taxonomy
// Check if the term "fiction" exists in the "book_genre" taxonomy
$term_exists = is_term('fiction', 'book_genre');
Check if a term exists under a specific parent term
// Check if the term "Europe" exists in the "destination" taxonomy under the parent term with ID 5
$term_exists = is_term('Europe', 'destination', 5);
Check if a term exists and output a message
// Check if the term "cooking" exists in the "category" taxonomy
$term_exists = is_term('cooking', 'category');
// Output a message based on the result
if ($term_exists) {
echo 'The term "cooking" exists.';
} else {
echo 'The term "cooking" does not exist.';
}