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Filename : pattern.php
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<?php
/**
 * Server-side rendering of the `core/pattern` block.
 *
 * @package WordPress
 */

/**
 *  Registers the `core/pattern` block on the server.
 *
 * @return void
 */
function register_block_core_pattern() {
	register_block_type_from_metadata(
		__DIR__ . '/pattern',
		array(
			'render_callback' => 'render_block_core_pattern',
		)
	);
}

/**
 * Renders the `core/pattern` block on the server.
 *
 * @param array $attributes Block attributes.
 *
 * @return string Returns the output of the pattern.
 */
function render_block_core_pattern( $attributes ) {
	if ( empty( $attributes['slug'] ) ) {
		return '';
	}

	$slug     = $attributes['slug'];
	$registry = WP_Block_Patterns_Registry::get_instance();
	if ( ! $registry->is_registered( $slug ) ) {
		return '';
	}

	$pattern = $registry->get_registered( $slug );
	return do_blocks( $pattern['content'] );
}

add_action( 'init', 'register_block_core_pattern' );