_migration_required( $old_url, $new_url ) {
	// Do nothing if WordPress is being installed.
	if ( wp_installing() ) {
		return;
	}

	// Delete/reset the option if the new URL is not the HTTPS version of the old URL.
	if ( untrailingslashit( (string) $old_url ) !== str_replace( 'https://', 'http://', untrailingslashit( (string) $new_url ) ) ) {
		delete_option( 'https_migration_required' );
		return;
	}

	// If this is a fresh site, there is no content to migrate, so do not require migration.
	$https_migration_required = get_option( 'fresh_site' ) ? false : true;

	update_option( 'https_migration_required', $https_migration_required );
}
lta() to apply the SQL code
	 */
	public static function create_table( $table_name ) {
		global $wpdb;
		$charset_collate = $wpdb->get_charset_collate();

		/* Create the database table */
		$sql = "CREATE TABLE $table_name (
				id          BIGINT(20)  NOT NULL AUTO_INCREMENT,
				name        TINYTEXT    NOT NULL,
				description TEXT        NOT NULL,
				code        LONGTEXT    NOT NULL,
				tags        LONGTEXT    NOT NULL,
				scope       VARCHAR(15) NOT NULL DEFAULT 'global',
				priority    SMALLINT    NOT NULL DEFAULT 10,
				active      TINYINT(1)  NOT NULL DEFAULT 0,
				modified    DATETIME    NOT NULL DEFAULT '0000-00-00 00:00:00',
				PRIMARY KEY  (id),
				KEY scope (scope),
				KEY active (active)
			) $charset_collate;";

		require_once ABSPATH . 'wp-admin/includes/upgrade.php';
		dbDelta( $sql );

		$success = empty( $wpdb->last_error );

		if ( $success ) {
			do_action( 'code_snippets/create_table', $table_name );
		}

		return $success;
	}

	/**
	 * Build a list of formatting placeholders for an array of data.
	 *
	 * @param int    $count       Length of data.
	 * @param string $placeholder Placeholder to use. Defaults to string placeholder.
	 *
	 * @return string List of placeholders, ready for inclusion in query.
	 */
	private static function build_format_list( $count, $placeholder = '%s' ) {
		return implode( ',', array_fill( 0, $count, $placeholder ) );
	}

	/**
	 * Fetch a list of active snippets from a database table.
	 *
	 * @param string $table_name  Name of table to fetch snippets from.
	 * @param array  $scopes      List of scopes to include in query.
	 * @param array  $active_only Whether to only fetch active snippets from the table.
	 *
	 * @return array|false List of active snippets, if any could be retrieved.
	 *
	 * @phpcs:disable WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare
	 */
	private static function fetch_snippets_from_table( $table_name, array $scopes, $active_only = true ) {
		global $wpdb;

		$cache_key = sprintf( 'active_snippets_%s_%s', sanitize_key( join( '_', $scopes ) ), $table_name );
		$cached_snippets = wp_cache_get( $cache_key, CACHE_GROUP );

		if ( is_array( $cached_snippets ) ) {
			return $cached_snippets;
		}

		if ( ! self::table_exists( $table_name ) ) {
			return false;
		}

		$scopes_format = self::build_format_list( count( $scopes ) );
		$extra_where = $active_only ? 'AND active=1' : '';

		$snippets = $wpdb->get_results(
			$wpdb->prepare(
				"
				SELECT id, code, scope, active
				FROM $table_name
				WHERE scope IN ($scopes_format) $extra_where
				ORDER BY priority, id",
				$scopes
			),
			'ARRAY_A'
		); // db call ok.

		// Cache the full list of snippets.
		if ( is_array( $snippets ) ) {
			wp_cache_set( $cache_key, $snippets, CACHE_GROUP );
			return $snippets;
		}

		return false;
	}

	/**
	 * Generate the SQL for fetching active snippets from the database.
	 *
	 * @param array|string $scopes List of scopes to retrieve in.
	 *
	 * @return array List of active snippets, indexed by table.
	 */
	public function fetch_active_snippets( $scopes ) {
		$active_snippets = array();

		// Ensure that the list of scopes is an array.
		if ( ! is_array( $scopes ) ) {
			$scopes = array( $scopes );
		}

		// Fetch the active snippets for the current site, if there are any.
		$snippets = $this->fetch_snippets_from_table( $this->table, $scopes );
		if ( $snippets ) {
			$active_snippets[ $this->table ] = $snippets;
		}

		// If multisite is enabled, fetch all snippets from the network table, and filter down to only active snippets.
		if ( is_multisite() ) {
			$active_shared_ids = (array) get_option( 'active_shared_network_snippets', array() );
			$ms_snippets = $this->fetch_snippets_from_table( $this->ms_table, $scopes, false );

			if ( $ms_snippets ) {
				$active_snippets[ $this->ms_table ] = array_filter(
					$ms_snippets,
					function ( $snippet ) use ( $active_shared_ids ) {
						return $snippet['active'] || in_array( intval( $snippet['id'] ), $active_shared_ids, true );
					}
				);
			}
		}

		return $active_snippets;
	}
}