public static function LanguageLookup($languagecode, $casesensitive=false) {

    if (!$casesensitive) {
      $languagecode = strtolower($languagecode);
    }

    // http://www.id3.org/id3v2.4.0-structure.txt
    // [4.   ID3v2 frame overview]
    // The three byte language field, present in several frames, is used to
    // describe the language of the frame's content, according to ISO-639-2
    // [ISO-639-2]. The language should be represented in lower case. If the
    // language is not known the string "XXX" should be used.


    // ISO 639-2 - http://www.id3.org/iso639-2.html

    $begin = __LINE__;

    
/** This is not a comment!

XXXunknown
xxxunknown
aarAfar
abkAbkhazian
aceAchinese
achAcoli
adaAdangme
afaAfro-Asiatic (Other)
afhAfrihili
afrAfrikaans
akaAkan
akkAkkadian
albAlbanian
aleAleut
algAlgonquian Languages
amhAmharic
angEnglish, Old (ca. 450-1100)
apaApache Languages
araArabic
arcAramaic
armArmenian
arnAraucanian
arpArapaho
artArtificial (Other)
arwArawak
asmAssamese
athAthapascan Languages
avaAvaric
aveAvestan
awaAwadhi
aymAymara
azeAzerbaijani
badBanda
baiBamileke Languages
bakBashkir
balBaluchi
bamBambara
banBalinese
baqBasque
basBasa
batBaltic (Other)
bejBeja
belByelorussian
bemBemba
benBengali
berBerber (Other)
bhoBhojpuri
bihBihari
bikBikol
binBini
bisBislama
blaSiksika
bntBantu (Other)
bodTibetan
braBraj
breBreton
buaBuriat
bugBuginese
bulBulgarian
burBurmese
cadCaddo
caiCentral American Indian (Other)
carCarib
catCatalan
cauCaucasian (Other)
cebCebuano
celCeltic (Other)
cesCzech
chaChamorro
chbChibcha
cheChechen
chgChagatai
chiChinese
chmMari
chnChinook jargon
choChoctaw
chrCherokee
chuChurch Slavic
chvChuvash
chyCheyenne
copCoptic
corCornish
cosCorsican
cpeCreoles and Pidgins, English-based (Other)
cpfCreoles and Pidgins, French-based (Other)
cppCreoles and Pidgins, Portuguese-based (Other)
creCree
crpCreoles and Pidgins (Other)
cusCushitic (Other)
cymWelsh
czeCzech
dakDakota
danDanish
delDelaware
deuGerman
dinDinka
divDivehi
doiDogri
draDravidian (Other)
duaDuala
dumDutch, Middle (ca. 1050-1350)
dutDutch
dyuDyula
dzoDzongkha
efiEfik
egyEgyptian (Ancient)
ekaEkajuk
ellGreek, Modern (1453-)
elxElamite
engEnglish
enmEnglish, Middle (ca. 1100-1500)
epoEsperanto
eskEskimo (Other)
eslSpanish
estEstonian
eusBasque
eweEwe
ewoEwondo
fanFang
faoFaroese
fasPersian
fatFanti
fijFijian
finFinnish
fiuFinno-Ugrian (Other)
fonFon
fraFrench
freFrench
frmFrench, Middle (ca. 1400-1600)
froFrench, Old (842- ca. 1400)
fryFrisian
fulFulah
gaaGa
gaeGaelic (Scots)
gaiIrish
gayGayo
gdhGaelic (Scots)
gemGermanic (Other)
geoGeorgian
gerGerman
gezGeez
gilGilbertese
glgGallegan
gmhGerman, Middle High (ca. 1050-1500)
gohGerman, Old High (ca. 750-1050)
gonGondi
gotGothic
grbGrebo
grcGreek, Ancient (to 1453)
greGreek, Modern (1453-)
grnGuarani
gujGujarati
haiHaida
hauHausa
hawHawaiian
hebHebrew
herHerero
hilHiligaynon
himHimachali
hinHindi
hmoHiri Motu
hunHungarian
hupHupa
hyeArmenian
ibaIban
iboIgbo
iceIcelandic
ijoIjo
ikuInuktitut
iloIloko
inaInterlingua (International Auxiliary language Association)
incIndic (Other)
indIndonesian
ineIndo-European (Other)
ineInterlingue
ipkInupiak
iraIranian (Other)
iriIrish
iroIroquoian uages
islIcelandic
itaItalian
javJavanese
jawJavanese
jpnJapanese
jprJudeo-Persian
jrbJudeo-Arabic
kaaKara-Kalpak
kabKabyle
kacKachin
kalGreenlandic
kamKamba
kanKannada
karKaren
kasKashmiri
katGeorgian
kauKanuri
kawKawi
kazKazakh
khaKhasi
khiKhoisan (Other)
khmKhmer
khoKhotanese
kikKikuyu
kinKinyarwanda
kirKirghiz
kokKonkani
komKomi
konKongo
korKorean
kpeKpelle
kroKru
kruKurukh
kuaKuanyama
kumKumyk
kurKurdish
kusKusaie
kutKutenai
ladLadino
lahLahnda
lamLamba
laoLao
latLatin
lavLatvian
lezLezghian
linLingala
litLithuanian
lolMongo
lozLozi
ltzLetzeburgesch
lubLuba-Katanga
lugGanda
luiLuiseno
lunLunda
luoLuo (Kenya and Tanzania)
macMacedonian
madMadurese
magMagahi
mahMarshall
maiMaithili
makMacedonian
makMakasar
malMalayalam
manMandingo
maoMaori
mapAustronesian (Other)
marMarathi
masMasai
maxManx
mayMalay
menMende
mgaIrish, Middle (900 - 1200)
micMicmac
minMinangkabau
misMiscellaneous (Other)
mkhMon-Kmer (Other)
mlgMalagasy
mltMaltese
mniManipuri
mnoManobo Languages
mohMohawk
molMoldavian
monMongolian
mosMossi
mriMaori
msaMalay
mulMultiple Languages
munMunda Languages
musCreek
mwrMarwari
myaBurmese
mynMayan Languages
nahAztec
naiNorth American Indian (Other)
nauNauru
navNavajo
nblNdebele, South
ndeNdebele, North
ndoNdongo
nepNepali
newNewari
nicNiger-Kordofanian (Other)
niuNiuean
nlaDutch
nnoNorwegian (Nynorsk)
nonNorse, Old
norNorwegian
nsoSotho, Northern
nubNubian Languages
nyaNyanja
nymNyamwezi
nynNyankole
nyoNyoro
nziNzima
ociLangue d'Oc (post 1500)
ojiOjibwa
oriOriya
ormOromo
osaOsage
ossOssetic
otaTurkish, Ottoman (1500 - 1928)
otoOtomian Languages
paaPapuan-Australian (Other)
pagPangasinan
palPahlavi
pamPampanga
panPanjabi
papPapiamento
pauPalauan
peoPersian, Old (ca 600 - 400 B.C.)
perPersian
phnPhoenician
pliPali
polPolish
ponPonape
porPortuguese
praPrakrit uages
proProvencal, Old (to 1500)
pusPushto
queQuechua
rajRajasthani
rarRarotongan
roaRomance (Other)
rohRhaeto-Romance
romRomany
ronRomanian
rumRomanian
runRundi
rusRussian
sadSandawe
sagSango
sahYakut
saiSouth American Indian (Other)
salSalishan Languages
samSamaritan Aramaic
sanSanskrit
scoScots
scrSerbo-Croatian
selSelkup
semSemitic (Other)
sgaIrish, Old (to 900)
shnShan
sidSidamo
sinSinghalese
sioSiouan Languages
sitSino-Tibetan (Other)
slaSlavic (Other)
slkSlovak
sloSlovak
slvSlovenian
smiSami Languages
smoSamoan
snaShona
sndSindhi
sogSogdian
somSomali
sonSonghai
sotSotho, Southern
spaSpanish
sqiAlbanian
srdSardinian
srrSerer
ssaNilo-Saharan (Other)
sswSiswant
sswSwazi
sukSukuma
sunSudanese
susSusu
suxSumerian
sveSwedish
swaSwahili
sweSwedish
syrSyriac
tahTahitian
tamTamil
tatTatar
telTelugu
temTimne
terTereno
tgkTajik
tglTagalog
thaThai
tibTibetan
tigTigre
tirTigrinya
tivTivi
tliTlingit
tmhTamashek
togTonga (Nyasa)
tonTonga (Tonga Islands)
truTruk
tsiTsimshian
tsnTswana
tsoTsonga
tukTurkmen
tumTumbuka
turTurkish
tutAltaic (Other)
twiTwi
tyvTuvinian
ugaUgaritic
uigUighur
ukrUkrainian
umbUmbundu
undUndetermined
urdUrdu
uzbUzbek
vaiVai
venVenda
vieVietnamese
volVolapük
votVotic
wakWakashan Languages
walWalamo
warWaray
wasWasho
welWelsh
wenSorbian Languages
wolWolof
xhoXhosa
yaoYao
yapYap
yidYiddish
yorYoruba
zapZapotec
zenZenaga
zhaZhuang
zhoChinese
zulZulu
zunZuni

*/

    return getid3_lib::EmbeddedLookup($languagecode, $begin, __LINE__, __FILE__, 'id3v2-languagecode');
  }