Oxid variables abreviations/aliases

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1

Hello. I’ve took a look on the code behind the shop and I find it confusing having different aliases on the variables that are not detailed anywhere. Can anyone explain me the role of “s”, “a”, “i”, “o” before the variables names?
Eg:
$sSql, $oPayments, $aLanguages, $oLang, $iLanguageId and so on.

Thank you!

2

Hungarian notation.
s string a array i integer o object
Not used anymore in Oxid 6.

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3

Thank you a lot!