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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 |
---|---|
266 | } |
267 |
|
268 | /** |
269 | * Fires before an importer screen is loaded. |
270 | * |
271 | * The dynamic portion of the hook name, $importer, refers to the importer slug. |
272 | * |
273 | * @since 3.5.0 |
274 | */ |
275 | do_action( 'load-importer-' . $importer ); |
276 |
|
277 | $parent_file = 'tools.php'; |
278 | $submenu_file = 'import.php'; |
279 | $title = __('Import'); |
280 |
|
281 | if (! isset($_GET['noheader'])) |
282 | require_once(ABSPATH . 'wp-admin/admin-header.php'); |
283 |
|
284 | require_once(ABSPATH . 'wp-admin/includes/upgrade.php'); |