Libraries tagged by check-digits

Helper classes to calculate and validate ckecksums

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This library is a set of static methods for GTIN validation. Methods return true if given string is publicly available GTIN-8, GTIN-12, GTIN-13 or GTIN-14 code. Checks include format, check digit and prefix.

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HKID digit check

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Check Digit Algorithms

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A PHP library that calculates and verifies the check digit using the Damm algorithm.

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Utility to calculate check digits on CNPJ (Brazilian Business Tax ID)

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Damm algorithm functions, a check digit algorithm that detects single-digit errors and adjacent transposition errors

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Check Digit Validation for PHP 5.3+

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Validate and generate Mexican identifiers — RFC, CURP, CLABE, NSS and código postal — with real check-digit verification. Framework-agnostic core with an optional Laravel bridge (rules, casts, Faker).

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Random IDs optimized for visual transcription, with a curated alphabet, normalization, and a built-in check character.

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Utility to calculate check digits on CPF (Brazilian Individual's Taxpayer ID)

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Helper classes to calculate and validate ckecksums

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A checksum calculator for the UPC check digit method

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Cria e valida check digit para nif

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