OK: Found an XML parser.
OK: Support for GZIP encoding.
OK: Support for character munging.

Example Output

Channel: Fast Media Service

RSS URL:

Parsed Results (var_dump'ed)

object(MagpieRSS)#2 (23) {
  ["parser"]=>
  int(0)
  ["current_item"]=>
  array(0) {
  }
  ["items"]=>
  array(0) {
  }
  ["channel"]=>
  array(7) {
    ["title"]=>
    string(18) "Fast Media Service"
    ["link"]=>
    string(28) "https://fastmediaservice.com"
    ["lastbuilddate"]=>
    string(31) "Mon, 07 Jun 2021 03:30:45 +0000"
    ["language"]=>
    string(5) "en-US"
    ["sy"]=>
    array(2) {
      ["updateperiod"]=>
      string(9) "
	hourly	"
      ["updatefrequency"]=>
      string(4) "
	1	"
    }
    ["generator"]=>
    string(28) "https://wordpress.org/?v=5.8"
    ["tagline"]=>
    NULL
  }
  ["textinput"]=>
  array(0) {
  }
  ["image"]=>
  array(0) {
  }
  ["feed_type"]=>
  string(3) "RSS"
  ["feed_version"]=>
  string(3) "2.0"
  ["encoding"]=>
  string(5) "UTF-8"
  ["_source_encoding"]=>
  string(0) ""
  ["ERROR"]=>
  string(0) ""
  ["WARNING"]=>
  string(0) ""
  ["_CONTENT_CONSTRUCTS"]=>
  array(6) {
    [0]=>
    string(7) "content"
    [1]=>
    string(7) "summary"
    [2]=>
    string(4) "info"
    [3]=>
    string(5) "title"
    [4]=>
    string(7) "tagline"
    [5]=>
    string(9) "copyright"
  }
  ["_KNOWN_ENCODINGS"]=>
  array(3) {
    [0]=>
    string(5) "UTF-8"
    [1]=>
    string(8) "US-ASCII"
    [2]=>
    string(10) "ISO-8859-1"
  }
  ["stack"]=>
  array(0) {
  }
  ["inchannel"]=>
  bool(false)
  ["initem"]=>
  bool(false)
  ["incontent"]=>
  bool(false)
  ["intextinput"]=>
  bool(false)
  ["inimage"]=>
  bool(false)
  ["current_namespace"]=>
  bool(false)
  ["last_modified"]=>
  string(31) "Mon, 07 Jun 2021 03:30:45 GMT
"
  ["etag"]=>
  string(36) ""58f320e6dbcf137be20a20f11c08d53b"
"
}