WordPress at a glance
function is not described

WP_Block_Styles_Registry::is_registered() public WP 5.3.0

Checks if a block style is registered.

{} It's a method of the class: WP_Block_Styles_Registry{}

No Hooks.

Return

true|false. True if the block style is registered, false otherwise.

Usage

$WP_Block_Styles_Registry = new WP_Block_Styles_Registry();
$WP_Block_Styles_Registry->is_registered( $block_name, $block_style_name );
$block_name(string) (required)
Block type name including namespace.
$block_style_name(string) (required)
Block style name.

Changelog

Since 5.3.0 Introduced.

Code of WP_Block_Styles_Registry::is_registered() WP 5.7.2

<?php
public function is_registered( $block_name, $block_style_name ) {
	return isset( $this->registered_block_styles[ $block_name ][ $block_style_name ] );
}