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I want to echo the term slug for each post on an archive page.

To get the term slug i'm using the following code:

$terms = get_the_terms( get_the_ID(), 'type_kennisbank' );

That returns me the data that I want:

array(1) { [0]=> object(WP_Term)#18648 (11) { ["term_id"]=> int(28) ["name"]=> 
string(10) "Whitepaper" ["slug"]=> string(10) "whitepaper" ["term_group"]=> 
int(0) ["term_taxonomy_id"]=> int(28) ["taxonomy"]=> string(15) 
"type_kennisbank" ["description"]=> string(0) "" ["parent"]=> int(0)  
["count"]=> int(3) ["filter"]=> string(3) "raw" ["term_order"]=> string(1) "0" } }

If I want to echo the slug I'm using:

echo $terms["slug"]

However it returns nothing. I already found a solution to echo the term slug but I'm wondering why my own echo code doesn't return the slug.

Anyone who can explain this?

  • $terms is an array and each item is an object. E.g. For the data in your question, you can do echo $terms[0]->slug; to display the term slug. – Sally CJ Dec 12 '18 at 14:49
  • You're welcome. :) And be sure to check Hector's answer, because he's correct - get_the_terms() could return a WP_Error instance, or that the array could contain two or more items. All the best! – Sally CJ Dec 13 '18 at 2:03
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The get_the_terms function returns array of WP_Term objects. So you need to use something like this to echo a single term slug:

echo $terms[0]->slug;

Also be aware of results of this function. As documentation says it returns:

Array of WP_Term objects on success, false if there are no terms or the post does not exist, WP_Error on failure.

So you need some checks before trying to echo terms. The following code may help you.

$terms = get_the_terms( get_the_ID(), 'type_kennisbank' );

if ( $terms && ! is_wp_error( $terms ) ) {
    foreach ( $terms as $term ) {
        echo $term->slug;
    }
}
| improve this answer | |
  • Yes that's the solution that I found as well in the Codex. However I only needed to echo the slug to add it as a CSS-class. But I agree about the check in advance before outputting the slug. Thanks! – NielsPilon Dec 13 '18 at 9:04

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