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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 |
|---|---|
| 827 | * Allows render_block() to be short-circuited, by returning a non-null value. |
| 828 | * |
| 829 | * @since 5.1.0 |
| 830 | * @since 5.9.0 The `$parent_block` parameter was added. |
| 831 | * |
| 832 | * @param string|null $pre_render The pre-rendered content. Default null. |
| 833 | * @param array $parsed_block The block being rendered. |
| 834 | * @param WP_Block|null $parent_block If this is a nested block, a reference to the parent block. |
| 835 | */ |
| 836 | $pre_render = apply_filters( 'pre_render_block', null, $parsed_block, $parent_block ); |
| 837 | if ( ! is_null( $pre_render ) ) { |
| 838 | return $pre_render; |
| 839 | } |
| 840 | |
| 841 | $source_block = $parsed_block; |
| 842 | |
| 843 | /** |
| 844 | * Filters the block being rendered in render_block(), before it's processed. |
| 845 | * |