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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
Line | Code |
---|---|
2737 | } |
2738 | /** |
2739 | * Filter a term before it is sanitized and inserted into the database. |
2740 | * |
2741 | * @since 3.0.0 |
2742 | * |
2743 | * @param string $term The term to add or update. |
2744 | * @param string $taxonomy Taxonomy slug. |
2745 | */ |
2746 | $term = apply_filters( 'pre_insert_term', $term, $taxonomy ); |
2747 | if ( is_wp_error( $term ) ) { |
2748 | return $term; |
2749 | } |
2750 | if ( is_int($term) && 0 == $term ) { |
2751 | return new WP_Error('invalid_term_id', __('Invalid term ID')); |
2752 | } |
2753 | if ( '' == trim($term) ) { |
2754 | return new WP_Error('empty_term_name', __('A name is required for this term')); |
2755 | } |