wp-includes/block-template-utils.php:524Returns an array containing the references of the passed blocks and their inner blocks.
$blocksarrayarrayfunction _flatten_blocks( &$blocks ) { $all_blocks = array(); $queue = array(); foreach ( $blocks as &$block ) { $queue[] = &$block; } while ( count( $queue ) > 0 ) { $block = &$queue[0]; array_shift( $queue ); $all_blocks[] = &$block; if ( ! empty( $block['innerBlocks'] ) ) { foreach ( $block['innerBlocks'] as &$inner_block ) { $queue[] = &$inner_block; } } } return $all_blocks;}Introduced in 5.9.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/block-template-utils.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.