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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 |
|---|---|
| 2120 | |
| 2121 | /** |
| 2122 | * Filters a term before it is sanitized and inserted into the database. |
| 2123 | * |
| 2124 | * @since 3.0.0 |
| 2125 | * |
| 2126 | * @param string|WP_Error $term The term name to add or update, or a WP_Error object if there's an error. |
| 2127 | * @param string $taxonomy Taxonomy slug. |
| 2128 | */ |
| 2129 | $term = apply_filters( 'pre_insert_term', $term, $taxonomy ); |
| 2130 | if ( is_wp_error( $term ) ) { |
| 2131 | return $term; |
| 2132 | } |
| 2133 | if ( is_int( $term ) && 0 === $term ) { |
| 2134 | return new WP_Error( 'invalid_term_id', __( 'Invalid term ID.' ) ); |
| 2135 | } |
| 2136 | if ( '' === trim( $term ) ) { |
| 2137 | return new WP_Error( 'empty_term_name', __( 'A name is required for this term.' ) ); |
| 2138 | } |