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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 | 
|---|---|
| 359 |             *     An array of metadata about the available plugin update. | 
| 360 |             * | 
| 361 |             *     @type int    $id           Plugin ID. | 
| 362 |             *     @type string $slug         Plugin slug. | 
| 363 |             *     @type string $new_version  New plugin version. | 
| 364 |             *     @type string $url          Plugin URL. | 
| 365 |             *     @type string $package      Plugin update package URL. | 
| 366 |             * } | 
| 367 |            */ | 
| 368 |           do_action( "in_plugin_update_message-{$file}", $plugin_data, $r ); | 
| 369 |  | 
| 370 |           echo '</div></td></tr>'; | 
| 371 |      } | 
| 372 | } | 
| 373 |  | 
| 374 | /** | 
| 375 |  * | 
| 376 |  * @return array | 
| 377 |  */ |