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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 |
|---|---|
| 261 | /** |
| 262 | * Fires when a custom plugin or theme update request is received. |
| 263 | * |
| 264 | * The dynamic portion of the hook name, $action, refers to the action |
| 265 | * provided in the request for wp-admin/update.php. Can be used to |
| 266 | * provide custom update functionality for themes and plugins. |
| 267 | * |
| 268 | * @since 2.8.0 |
| 269 | */ |
| 270 | do_action( "update-custom_{$action}" ); |
| 271 | } |
| 272 | } |
| 273 | |