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WP_Block_Styles_Registry::unregister( string $block_name, string $block_style_name )

Unregisters a block style.

Parameters

$block_name

(string) (Required) Block type name including namespace.

$block_style_name

(string) (Required) Block style name.

Return

(boolean) True if the block style was unregistered with success and false otherwise.

Source

File: wp-includes/class-wp-block-styles-registry.php 

public function unregister( $block_name, $block_style_name ) {
		if ( ! $this->is_registered( $block_name, $block_style_name ) ) {
			/* translators: 1: Block name, 2: Block style name. */
			$message = sprintf( __( 'Block "%1$s" does not contain a style named "%2$s".' ), $block_name, $block_style_name );
			_doing_it_wrong( __METHOD__, $message, '5.3.0' );
			return false;
		}

		unset( $this->registered_block_styles[ $block_name ][ $block_style_name ] );

		return true;
	}

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/classes/wp_block_styles_registry/unregister