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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 |
|---|---|
| 2106 | * } |
| 2107 | * @return array|WP_Error An array containing the term_id and term_taxonomy_id, WP_Error otherwise. |
| 2108 | */ |
| 2109 | function wp_insert_term( $term, $taxonomy, $args = array() ) { |
| 2110 | global $wpdb; |
| 2111 | |
| 2112 | if ( ! taxonomy_exists($taxonomy) ) |
| 2113 | return new WP_Error('invalid_taxonomy', __('Invalid taxonomy')); |
| 2114 | |
| 2115 | $term = apply_filters( 'pre_insert_term', $term, $taxonomy ); |
| 2116 | if ( is_wp_error( $term ) ) |
| 2117 | return $term; |
| 2118 | |
| 2119 | if ( is_int($term) && 0 == $term ) |
| 2120 | return new WP_Error('invalid_term_id', __('Invalid term ID')); |
| 2121 | |
| 2122 | if ( '' == trim($term) ) |
| 2123 | return new WP_Error('empty_term_name', __('A name is required for this term')); |
| 2124 | |