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', '' ), ); } } } /** * Adds CSS classes for block alignment to the incoming attributes array. * This will be applied to the block markup in the front-end. * * @since 5.6.0 * @access private * * @param WP_Block_Type $block_type Block Type. * @param array $block_attributes Block attributes. * @return array Block alignment CSS classes and inline styles. */ function wp_apply_alignment_support( $block_type, $block_attributes ) { $attributes = array(); $has_align_support = block_has_support( $block_type, 'align', false ); if ( $has_align_support ) { $has_block_alignment = array_key_exists( 'align', $block_attributes ); if ( $has_block_alignment ) { $attributes['class'] = sprintf( 'align%s', $block_attributes['align'] ); } } return $attributes; } // Register the block support. WP_Block_Supports::get_instance()->register( 'align', array( 'register_attribute' => 'wp_register_alignment_support', 'apply' => 'wp_apply_alignment_support', ) );