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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 |
|---|---|
| 1387 | /** |
| 1388 | * Filter whether a dynamic sidebar is considered "active". |
| 1389 | * |
| 1390 | * @since 3.9.0 |
| 1391 | * |
| 1392 | * @param bool $is_active_sidebar Whether or not the sidebar should be considered "active". |
| 1393 | * In other words, whether the sidebar contains any widgets. |
| 1394 | * @param int|string $index Index, name, or ID of the dynamic sidebar. |
| 1395 | */ |
| 1396 | return apply_filters( 'is_active_sidebar', $is_active_sidebar, $index ); |
| 1397 | } |
| 1398 | |
| 1399 | /* Internal Functions */ |
| 1400 | |
| 1401 | /** |
| 1402 | * Retrieve full list of sidebars and their widget instance IDs. |
| 1403 | * |
| 1404 | * Will upgrade sidebar widget list, if needed. Will also save updated list, if |
| 1405 | * needed. |