Edit: class-wp-block-patterns-registry.php

<?php
/**
 * Blocks API: WP_Block_Patterns_Registry class
 *
 * @package WordPress
 * @subpackage Blocks
 * @since 5.5.0
 */

/**
 * Class used for interacting with block patterns.
 *
 * @since 5.5.0
 */
#[AllowDynamicProperties]
final class WP_Block_Patterns_Registry {
	/**
	 * Registered block patterns array.
	 *
	 * @since 5.5.0
	 * @var array[]
	 */
	private $registered_patterns = array();

/**
	 * Patterns registered outside the `init` action.
	 *
	 * @since 6.0.0
	 * @var array[]
	 */
	private $registered_patterns_outside_init = array();

/**
	 * Container for the main instance of the class.
	 *
	 * @since 5.5.0
	 * @var WP_Block_Patterns_Registry|null
	 */
	private static $instance = null;

/**
	 * Registers a block pattern.
	 *
	 * @since 5.5.0
	 * @since 5.8.0 Added support for the `blockTypes` property.
	 * @since 6.1.0 Added support for the `postTypes` property.
	 * @since 6.2.0 Added support for the `templateTypes` property.
	 * @since 6.5.0 Added support for the `filePath` property.
	 *
	 * @param string $pattern_name       Block pattern name including namespace.
	 * @param array  $pattern_properties {
	 *     List of properties for the block pattern.
	 *
	 *     @type string   $title         Required. A human-readable title for the pattern.
	 *     @type string   $content       Optional. Block HTML markup for the pattern.
	 *                                   If not provided, the content will be retrieved from the `filePath` if set.
	 *                                   If both `content` and `filePath` are not set, the pattern will not be registered.
	 *     @type string   $description   Optional. Visually hidden text used to describe the pattern
	 *                                   in the inserter. A description is optional, but is strongly
	 *                                   encouraged when the title does not fully describe what the
	 *                                   pattern does. The description will help users discover the
	 *                                   pattern while searching.
	 *     @type int      $viewportWidth Optional. The intended width of the pattern to allow for a scaled
	 *                                   preview within the pattern inserter.
	 *     @type bool     $inserter      Optional. Determines whether the pattern is visible in inserter.
	 *                                   To hide a pattern so that it can only be inserted programmatically,
	 *                                   set this to false. Default true.
	 *     @type string[] $categories    Optional. A list of registered pattern categories used to group
	 *                                   block patterns. Block patterns can be shown on multiple categories.
	 *                                   A category must be registered separately in order to be used here.
	 *     @type string[] $keywords      Optional. A list of aliases or keywords that help users discover
	 *                                   the pattern while searching.
	 *     @type string[] $blockTypes    Optional. A list of block names including namespace that could use
	 *                                   the block pattern in certain contexts (placeholder, transforms).
	 *                                   The block pattern is available in the block editor inserter
	 *                                   regardless of this list of block names.
	 *                                   Certain blocks support further specificity besides the block name
	 *                                   (e.g. for `core/template-part` you can specify areas
	 *                                   like `core/template-part/header` or `core/template-part/footer`).
	 *     @type string[] $postTypes     Optional. An array of post types that the pattern is restricted
	 *                                   to be used with. The pattern will only be available when editing one
	 *                                   of the post types passed on the array. For all the other post types
	 *                                   not part of the array the pattern is not available at all.
	 *     @type string[] $templateTypes Optional. An array of template types where the pattern fits.
	 *     @type string   $filePath      Optional. The full path to the file containing the block pattern content.
	 * }
	 * @return bool True if the pattern was registered with success and false otherwise.
	 */
	public function register( $pattern_name, $pattern_properties ) {
		if ( ! isset( $pattern_name ) || ! is_string( $pattern_name ) ) {
			_doing_it_wrong(
				__METHOD__,
				__( 'Pattern name must be a string.' ),
				'5.5.0'
			);
			return false;
		}

if ( ! isset( $pattern_properties['title'] ) || ! is_string( $pattern_properties['title'] ) ) {
			_doing_it_wrong(
				__METHOD__,
				__( 'Pattern title must be a string.' ),
				'5.5.0'
			);
			return false;
		}

if ( ! isset( $pattern_properties['filePath'] ) ) {
			if ( ! isset( $pattern_properties['content'] ) || ! is_string( $pattern_properties['content'] ) ) {
				_doing_it_wrong(
					__METHOD__,
					__( 'Pattern content must be a string.' ),
					'5.5.0'
				);
				return false;
			}
		}

$pattern = array_merge(
			$pattern_properties,
			array( 'name' => $pattern_name )
		);

$this->registered_patterns[ $pattern_name ] = $pattern;

// If the pattern is registered inside an action other than `init`, store it
		// also to a dedicated array. Used to detect deprecated registrations inside
		// `admin_init` or `current_screen`.
		if ( current_action() && 'init' !== current_action() ) {
			$this->registered_patterns_outside_init[ $pattern_name ] = $pattern;
		}

return true;
	}

/**
	 * Unregisters a block pattern.
	 *
	 * @since 5.5.0
	 *
	 * @param string $pattern_name Block pattern name including namespace.
	 * @return bool True if the pattern was unregistered with success and false otherwise.
	 */
	public function unregister( $pattern_name ) {
		if ( ! $this->is_registered( $pattern_name ) ) {
			_doing_it_wrong(
				__METHOD__,
				/* translators: %s: Pattern name. */
				sprintf( __( 'Pattern "%s" not found.' ), $pattern_name ),
				'5.5.0'
			);
			return false;
		}

unset( $this->registered_patterns[ $pattern_name ] );
		unset( $this->registered_patterns_outside_init[ $pattern_name ] );

return true;
	}

/**
	 * Retrieves the content of a registered block pattern.
	 *
	 * @since 6.5.0
	 *
	 * @param string $pattern_name      Block pattern name including namespace.
	 * @param bool   $outside_init_only Optional. Return only patterns registered outside the `init` action. Default false.
	 * @return string The content of the block pattern.
	 */
	private function get_content( $pattern_name, $outside_init_only = false ) {
		if ( $outside_init_only ) {
			$patterns = &$this->registered_patterns_outside_init;
		} else {
			$patterns = &$this->registered_patterns;
		}
		if ( ! isset( $patterns[ $pattern_name ]['content'] ) && isset( $patterns[ $pattern_name ]['filePath'] ) ) {
			ob_start();
			include $patterns[ $pattern_name ]['filePath'];
			$patterns[ $pattern_name ]['content'] = ob_get_clean();
			unset( $patterns[ $pattern_name ]['filePath'] );
		}
		return $patterns[ $pattern_name ]['content'];
	}

/**
	 * Retrieves an array containing the properties of a registered block pattern.
	 *
	 * @since 5.5.0
	 *
	 * @param string $pattern_name Block pattern name including namespace.
	 * @return array|null Registered pattern properties or `null` if the pattern is not registered.
	 */
	public function get_registered( $pattern_name ) {
		if ( ! $this->is_registered( $pattern_name ) ) {
			return null;
		}

$pattern            = $this->registered_patterns[ $pattern_name ];
		$content            = $this->get_content( $pattern_name );
		$pattern['content'] = apply_block_hooks_to_content(
			$content,
			$pattern,
			'insert_hooked_blocks_and_set_ignored_hooked_blocks_metadata'
		);

return $pattern;
	}

/**
	 * Retrieves all registered block patterns.
	 *
	 * @since 5.5.0
	 *
	 * @param bool $outside_init_only Return only patterns registered outside the `init` action.
	 * @return array[] Array of arrays containing the registered block patterns properties,
	 *                 and per style.
	 */
	public function get_all_registered( $outside_init_only = false ) {
		$patterns      = $outside_init_only
				? $this->registered_patterns_outside_init
				: $this->registered_patterns;
		$hooked_blocks = get_hooked_blocks();

foreach ( $patterns as $index => $pattern ) {
			$content                       = $this->get_content( $pattern['name'], $outside_init_only );
			$patterns[ $index ]['content'] = apply_block_hooks_to_content(
				$content,
				$pattern,
				'insert_hooked_blocks_and_set_ignored_hooked_blocks_metadata'
			);
		}

return array_values( $patterns );
	}

/**
	 * Checks if a block pattern is registered.
	 *
	 * @since 5.5.0
	 *
	 * @param string|null $pattern_name Block pattern name including namespace.
	 * @return bool True if the pattern is registered, false otherwise.
	 */
	public function is_registered( $pattern_name ) {
		return isset( $pattern_name, $this->registered_patterns[ $pattern_name ] );
	}

public function __wakeup() {
		if ( ! $this->registered_patterns ) {
			return;
		}
		if ( ! is_array( $this->registered_patterns ) ) {
			throw new UnexpectedValueException();
		}
		foreach ( $this->registered_patterns as $value ) {
			if ( ! is_array( $value ) ) {
				throw new UnexpectedValueException();
			}
		}
		$this->registered_patterns_outside_init = array();
	}

/**
	 * Utility method to retrieve the main instance of the class.
	 *
	 * The instance will be created if it does not exist yet.
	 *
	 * @since 5.5.0
	 *
	 * @return WP_Block_Patterns_Registry The main instance.
	 */
	public static function get_instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}

return self::$instance;
	}
}

/**
 * Registers a new block pattern.
 *
 * @since 5.5.0
 *
 * @param string $pattern_name       Block pattern name including namespace.
 * @param array  $pattern_properties List of properties for the block pattern.
 *                                   See WP_Block_Patterns_Registry::register() for accepted arguments.
 * @return bool True if the pattern was registered with success and false otherwise.
 */
function register_block_pattern( $pattern_name, $pattern_properties ) {
	return WP_Block_Patterns_Registry::get_instance()->register( $pattern_name, $pattern_properties );
}

/**
 * Unregisters a block pattern.
 *
 * @since 5.5.0
 *
 * @param string $pattern_name Block pattern name including namespace.
 * @return bool True if the pattern was unregistered with success and false otherwise.
 */
function unregister_block_pattern( $pattern_name ) {
	return WP_Block_Patterns_Registry::get_instance()->unregister( $pattern_name );
}

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