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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 |
|---|---|
| 275 | } |
| 276 | |
| 277 | /** |
| 278 | * Fires before an importer screen is loaded. |
| 279 | * |
| 280 | * The dynamic portion of the hook name, `$importer`, refers to the importer slug. |
| 281 | * |
| 282 | * @since 3.5.0 |
| 283 | */ |
| 284 | do_action( "load-importer-{$importer}" ); |
| 285 | |
| 286 | $parent_file = 'tools.php'; |
| 287 | $submenu_file = 'import.php'; |
| 288 | $title = __('Import'); |
| 289 | |
| 290 | if (! isset($_GET['noheader'])) |
| 291 | require_once(ABSPATH . 'wp-admin/admin-header.php'); |
| 292 | |
| 293 | require_once(ABSPATH . 'wp-admin/includes/upgrade.php'); |