composer问题

The "http://pkg.phpcomposer.com/rep ... ot%3B file could not be downloaded: php_network_getaddresses: getaddrinfo failed: No address associated with hostname
failed to open stream: php_network_getaddresses: getaddrinfo failed: No address associated with hostname
http://pkg.phpcomposer.com/repo/packagist could not be fully loaded, package information was loaded from the local cache and may be out of date
Warning from http://pkg.phpcomposer.com/repo/packagist: This is an old cached copy, https://packagist.org could not be reached