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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 | 
|---|---|
| 412 |                     } else if ( 'ping' == $context ) { | 
| 413 |                          $ping->comment_content .= $line; | 
| 414 |                     } | 
| 415 |                } | 
| 416 |           } | 
| 417 |  | 
| 418 |           echo '</ol>'; | 
| 419 |  | 
| 420 |           wp_import_cleanup($this->id); | 
| 421 |           do_action('import_done', 'mt'); | 
| 422 |  | 
| 423 |           echo '<h3>'.sprintf(__('All done. <a href="%s">Have fun!</a>'), get_option('home')).'</h3></div>'; | 
| 424 |      } | 
| 425 |  | 
| 426 |      function import() { | 
| 427 |           $this->id = (int) $_GET['id']; | 
| 428 |           if ( $this->id == 0 ) | 
| 429 |                $this->file = WP_CONTENT_DIR . '/mt-export.txt'; | 
| 430 |           else |