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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 | 
|---|---|
| 3721 |      } | 
| 3722 |      /** | 
| 3723 |       * Filters the trimmed excerpt string. | 
| 3724 |       * | 
| 3725 |       * @since 2.8.0 | 
| 3726 |       * | 
| 3727 |       * @param string $text        The trimmed text. | 
| 3728 |       * @param string $raw_excerpt The text prior to trimming. | 
| 3729 |       */ | 
| 3730 |      return apply_filters( 'wp_trim_excerpt', $text, $raw_excerpt ); | 
| 3731 | } | 
| 3732 |  | 
| 3733 | /** | 
| 3734 |  * Trims text to a certain number of words. | 
| 3735 |  * | 
| 3736 |  * This function is localized. For languages that count 'words' by the individual | 
| 3737 |  * character (such as East Asian languages), the $num_words argument will apply | 
| 3738 |  * to the number of individual characters. | 
| 3739 |  * |