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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 |
|---|---|
| 2362 | |
| 2363 | /** |
| 2364 | * Filter a term before it is sanitized and inserted into the database. |
| 2365 | * |
| 2366 | * @since 3.0.0 |
| 2367 | * |
| 2368 | * @param string $term The term to add or update. |
| 2369 | * @param string $taxonomy Taxonomy slug. |
| 2370 | */ |
| 2371 | $term = apply_filters( 'pre_insert_term', $term, $taxonomy ); |
| 2372 | if ( is_wp_error( $term ) ) |
| 2373 | return $term; |
| 2374 | |
| 2375 | if ( is_int($term) && 0 == $term ) |
| 2376 | return new WP_Error('invalid_term_id', __('Invalid term ID')); |
| 2377 | |
| 2378 | if ( '' == trim($term) ) |
| 2379 | return new WP_Error('empty_term_name', __('A name is required for this term')); |
| 2380 | |