cp_get_core_checksums( string $version )

function cp_get_core_checksums( $version ) {
	$url = 'https://api-v1.classicpress.net/checksums/md5/' . $version . '.json';

	$options = array(
		'timeout' => wp_doing_cron() ? 30 : 3,
	);

	$response = wp_remote_get( $url, $options );

	if ( is_wp_error( $response ) ) {
		trigger_error(
			sprintf(
				/* translators: %s: support forums URL */
				__( 'An unexpected error occurred. Something may be wrong with ClassicPress.net or this server&#8217;s configuration. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
				__( 'https://forums.classicpress.net/c/support' )
			) . ' ' . __( '(ClassicPress could not establish a secure connection to ClassicPress.net. Please contact your server administrator.)' ),
			headers_sent() || WP_DEBUG ? E_USER_WARNING : E_USER_NOTICE
		);

		// Retry request
		$response = wp_remote_get( $url, $options );
	}

	if ( is_wp_error( $response ) || 200 != wp_remote_retrieve_response_code( $response ) ) {
		return false;
	}

	$body = trim( wp_remote_retrieve_body( $response ) );
	$body = json_decode( $body, true );

	if (
		! is_array( $body ) ||
		! isset( $body['checksums'] ) ||
		! is_array( $body['checksums'] )
	) {
		return false;
	}

	return $body['checksums'];
}