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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 |
|---|---|
| 219 | |
| 220 | foreach ( $this->inner_content as $chunk ) { |
| 221 | if ( is_string( $chunk ) ) { |
| 222 | $block_content .= $chunk; |
| 223 | } else { |
| 224 | $inner_block = $this->inner_blocks[ $index ]; |
| 225 | $parent_block = $this; |
| 226 | |
| 227 | /** This filter is documented in wp-includes/blocks.php */ |
| 228 | $pre_render = apply_filters( 'pre_render_block', null, $inner_block->parsed_block, $parent_block ); |
| 229 | |
| 230 | if ( ! is_null( $pre_render ) ) { |
| 231 | $block_content .= $pre_render; |
| 232 | } else { |
| 233 | $source_block = $inner_block->parsed_block; |
| 234 | |
| 235 | /** This filter is documented in wp-includes/blocks.php */ |
| 236 | $inner_block->parsed_block = apply_filters( 'render_block_data', $inner_block->parsed_block, $source_block, $parent_block ); |
| 237 | |