I have the following function I wrote …

add_filter('post_type_link', 'events_permalink_structure', 10, 4);

function events_permalink_structure($post_link, $post, $leavename, $sample) {
    if ( false !== strpos( $post_link, '%event_type%' ) ) {
        $event_type_term = get_the_terms( $post->ID, 'event_type' );
        $post_link = str_replace( '%event_type%', array_pop( $event_type_term )->slug, $post_link );
    return $post_link;

When creating a new post I get the following Warnings in the backend …

Warning: array_pop() expects parameter 1 to be array, boolean given in /Users/my/htdocs/wr/wp-content/themes/wr/functions.php on line 168

Notice: Trying to get property of non-object in /Users/my/htdocs/wr/wp-content/themes/wr/functions.php on line 168

Any ideas what I'm doing wrong here?

Thank you in advance!

1 Answer 1


get_the_terms() is probably returning false.

Do a print_r($event_type_term) to see what you have in it.

From: http://codex.wordpress.org/Function_Reference/get_the_terms

Array of term objects on success. False if no terms are found in the given taxonomy and a wp_error object if an invalid taxonomy is entered.

  • 1
    Ok, the thing is this only happens when adding a NEW custom-post. So for posts that do already have terms associated with it this doesn't happen. The problem is solved by adding this if ( !empty( $event_type_term ) ) Aug 2, 2012 at 8:22

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