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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 |
|---|---|
| 341 | * |
| 342 | * Returning a falsey value will opt out of the fallback and cause the block not to render. |
| 343 | * To customise the blocks provided return an array of blocks - these should be valid |
| 344 | * children of the `core/navigation` block. |
| 345 | * |
| 346 | * @since 5.9.0 |
| 347 | * |
| 348 | * @param array[] default fallback blocks provided by the default block mechanic. |
| 349 | */ |
| 350 | return apply_filters( 'block_core_navigation_render_fallback', $fallback_blocks ); |
| 351 | } |
| 352 | |
| 353 | /** |
| 354 | * Iterate through all inner blocks recursively and get navigation link block's post IDs. |
| 355 | * |
| 356 | * @param WP_Block_List $inner_blocks Block list class instance. |
| 357 | * |
| 358 | * @return array Array of post IDs. |
| 359 | */ |