wp-includes/blocks/accordion-item.php:79Registers the core/accordion-item block on server.
function register_block_core_accordion_item() { register_block_type_from_metadata( __DIR__ . '/accordion-item', array( 'render_callback' => 'block_core_accordion_item_render', ) );}Introduced in 6.9.0. Unchanged from 6.9.7 through 7.1.0.
Signature, return type and hooks compared across 3 parsed releases.
src/wp-includes/blocks/accordion-item.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.