WordPress at Your Fingertips
function is not described

wp_apply_custom_classname_support() WP 5.6.0

Add the custom classnames to the output.

No Hooks.

Return

Array. Block CSS classes and inline styles.

Usage

wp_apply_custom_classname_support( $block_type, $block_attributes );
$block_type(WP_Block_Type) (required)
Block Type.
$block_attributes(array) (required)
Block attributes.

Changelog

Since 5.6.0 Introduced.

Code of wp_apply_custom_classname_support() WP 5.8.1

function wp_apply_custom_classname_support( $block_type, $block_attributes ) {
	$has_custom_classname_support = block_has_support( $block_type, array( 'customClassName' ), true );
	$attributes                   = array();
	if ( $has_custom_classname_support ) {
		$has_custom_classnames = array_key_exists( 'className', $block_attributes );

		if ( $has_custom_classnames ) {
			$attributes['class'] = $block_attributes['className'];
		}
	}

	return $attributes;
}