WordPress at a glance
function is not described

wp_register_alignment_support() WP 1.0

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

No Hooks.

Return

null. Nothing.

Usage

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

Code of wp_register_alignment_support() WP 5.7.2

<?php
function wp_register_alignment_support( $block_type ) {
	$has_align_support = false;
	if ( property_exists( $block_type, 'supports' ) ) {
		$has_align_support = _wp_array_get( $block_type->supports, array( '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', '' ),
			);
		}
	}
}