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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 |
|---|---|
| 1970 | * @param array|string $args Change the values of the inserted term |
| 1971 | * @return array|WP_Error The Term ID and Term Taxonomy ID |
| 1972 | */ |
| 1973 | function wp_insert_term( $term, $taxonomy, $args = array() ) { |
| 1974 | global $wpdb; |
| 1975 | |
| 1976 | if ( ! taxonomy_exists($taxonomy) ) |
| 1977 | return new WP_Error('invalid_taxonomy', __('Invalid taxonomy')); |
| 1978 | |
| 1979 | $term = apply_filters( 'pre_insert_term', $term, $taxonomy ); |
| 1980 | if ( is_wp_error( $term ) ) |
| 1981 | return $term; |
| 1982 | |
| 1983 | if ( is_int($term) && 0 == $term ) |
| 1984 | return new WP_Error('invalid_term_id', __('Invalid term ID')); |
| 1985 | |
| 1986 | if ( '' == trim($term) ) |
| 1987 | return new WP_Error('empty_term_name', __('A name is required for this term')); |
| 1988 | |