headerにbasic認証用のAuthorizationと、User-Agentを追加するだけ(´▽｀)

    $opts = array(
        'http' => [
            'method' => 'GET',
            'header' => implode("\r\n",[
                'Authorization: Basic ' . base64_encode('ID:PASS'),
                'User-Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 12_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.0 Mobile/15E148 Safari/604.1',
            ]),
        ],
        'ssl' => [
            'verify_peer'      => false,
            'verify_peer_name' => false
        ]
    );
    
   file_get_contents($url, false, stream_context_create($opts));