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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 | 
|---|---|
| 2344 |  | 
| 2345 |      /** | 
| 2346 |       * Filters a term before it is sanitized and inserted into the database. | 
| 2347 |       * | 
| 2348 |       * @since 3.0.0 | 
| 2349 |       * | 
| 2350 |       * @param string|WP_Error $term     The term name to add, or a WP_Error object if there's an error. | 
| 2351 |       * @param string          $taxonomy Taxonomy slug. | 
| 2352 |       */ | 
| 2353 |      $term = apply_filters( 'pre_insert_term', $term, $taxonomy ); | 
| 2354 |  | 
| 2355 |      if ( is_wp_error( $term ) ) { | 
| 2356 |           return $term; | 
| 2357 |      } | 
| 2358 |  | 
| 2359 |      if ( is_int( $term ) && 0 === $term ) { | 
| 2360 |           return new WP_Error( 'invalid_term_id', __( 'Invalid term ID.' ) ); | 
| 2361 |      } | 
| 2362 |  |