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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 | 
|---|---|
| 288 |                     $preExisting = $numComments - numAddedComments; | 
| 289 |                     if ($preExisting > 0) { | 
| 290 |                          echo ' '; | 
| 291 |                          printf( __ngettext( 'ignored %s pre-existing comment', 'ignored %s pre-existing comments', $preExisting ) , $preExisting); | 
| 292 |                     } | 
| 293 |                } | 
| 294 |                echo '... <strong>'.__('Done').'</strong></li>'; | 
| 295 |           } | 
| 296 |      } | 
| 297 |      do_action('import_done', 'greymatter'); | 
| 298 |      ?> | 
| 299 | </ul><strong><?php _e('Done') ?></strong></li></ul> | 
| 300 | <p> </p> | 
| 301 | <p><?php _e('Completed GreyMatter import!') ?></p> | 
| 302 | <?php | 
| 303 |      $this->footer(); | 
| 304 |      return; | 
| 305 |      } | 
| 306 |  |