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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 |
|---|---|
| 477 | * |
| 478 | * Returning a falsey value will opt out of the fallback and cause the block not to render. |
| 479 | * To customise the blocks provided return an array of blocks - these should be valid |
| 480 | * children of the `core/navigation` block. |
| 481 | * |
| 482 | * @since 5.9.0 |
| 483 | * |
| 484 | * @param array[] default fallback blocks provided by the default block mechanic. |
| 485 | */ |
| 486 | return apply_filters( 'block_core_navigation_render_fallback', $fallback_blocks ); |
| 487 | } |
| 488 | |
| 489 | /** |
| 490 | * Iterate through all inner blocks recursively and get navigation link block's post IDs. |
| 491 | * |
| 492 | * @param WP_Block_List $inner_blocks Block list class instance. |
| 493 | * |
| 494 | * @return array Array of post IDs. |
| 495 | */ |