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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 | 
|---|---|
| 175 |       * | 
| 176 |       * Passing an empty value also prevents the {@see 'image_add_caption_shortcode'} | 
| 177 |       * filter from being evaluated at the end of {@see image_add_caption()}. | 
| 178 |       * | 
| 179 |       * @since 4.1.0 | 
| 180 |       * | 
| 181 |       * @param string $caption The original caption text. | 
| 182 |       * @param int    $id      The attachment ID. | 
| 183 |       */ | 
| 184 |      $caption = apply_filters( 'image_add_caption_text', $caption, $id ); | 
| 185 |  | 
| 186 |      /** | 
| 187 |       * Filter whether to disable captions. | 
| 188 |       * | 
| 189 |       * Prevents image captions from being appended to image HTML when inserted into the editor. | 
| 190 |       * | 
| 191 |       * @since 2.6.0 | 
| 192 |       * | 
| 193 |       * @param bool $bool Whether to disable appending captions. Returning true to the filter |