Registers a block style for the given block type.

If the block styles are present in a standalone stylesheet, register it and pass its handle as the style_handle argument. If the block styles should be inline, use the inline_style argument. Usually, one of them would be used to pass CSS styles. However, you could also skip them and provide CSS styles in any stylesheet or with an inline tag.

$block_name string Required

Block type name including namespace.

$style_properties array Required

Array containing the properties of the style.

• namestring
  The identifier of the style used to compute a CSS class.
• labelstring
  A human-readable label for the style.
• inline_stylestring
  Inline CSS code that registers the CSS class required for the style.
• style_handlestring
  The handle to an already registered style that should be enqueued in places where block styles are needed.
• is_defaultbool
  Whether this is the default style for the block type.

bool True if the block style was registered with success and false otherwise.

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

public function register( $block_name, $style_properties ) {

	if ( ! isset( $block_name ) || ! is_string( $block_name ) ) {
		_doing_it_wrong(
			__METHOD__,
			__( 'Block name must be a string.' ),
			'5.3.0'
		);
		return false;
	}

	if ( ! isset( $style_properties['name'] ) || ! is_string( $style_properties['name'] ) ) {
		_doing_it_wrong(
			__METHOD__,
			__( 'Block style name must be a string.' ),
			'5.3.0'
		);
		return false;
	}

	if ( str_contains( $style_properties['name'], ' ' ) ) {
		_doing_it_wrong(
			__METHOD__,
			__( 'Block style name must not contain any spaces.' ),
			'5.9.0'
		);
		return false;
	}

	$block_style_name = $style_properties['name'];

	if ( ! isset( $this->registered_block_styles[ $block_name ] ) ) {
		$this->registered_block_styles[ $block_name ] = array();
	}
	$this->registered_block_styles[ $block_name ][ $block_style_name ] = $style_properties;

	return true;
}