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php-iban
Generate, parse, validate, error-correct and present IBAN (and IIBAN) bank account information in PHP.
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Memories. About 12 years ago I looked in to this stuff as part of adding national checksum support to an IBAN library. It was quite a mission to discover the number of systems out there, most of which were insufficiently documented or undocumented. Wound up reverse engineering quite a few of them (period braindump available[3]).
In the end I wrote a function[1] which reverses an input known to fail a checksum to determine probable transcription errors based upon a manually compiled, exhaustive list of probable mistranscriptions[2].
[1] https://github.com/globalcitizen/php-iban/blob/master/php-ib...