wp_register_alignment_support() │ WP 5.6.0

Registers the align block attribute for block types that support it.

Internal function — this function is designed to be used by the kernel itself. It is not recommended to use this function in your code.

No Hooks.

Returns

null. Nothing (null).

Usage

wp_register_alignment_support( $block_type );
$block_type(WP_Block_Type) (required)
Block Type.

Changelog

Since 5.6.0 Introduced.

wp_register_alignment_support() code WP 6.8.3

wp-includes/block-supports/align.php 
function wp_register_alignment_support( $block_type ) {
	$has_align_support = block_has_support( $block_type, 'align', false );
	if ( $has_align_support ) {
		if ( ! $block_type->attributes ) {
			$block_type->attributes = array();
		}

		if ( ! array_key_exists( 'align', $block_type->attributes ) ) {
			$block_type->attributes['align'] = array(
				'type' => 'string',
				'enum' => array( 'left', 'center', 'right', 'wide', 'full', '' ),
			);
		}
	}
}