C4::Input - Miscellaneous sanity checks
use C4::Input;
This module provides functions to see whether a given library card number or ISBN is valid.
$valid = &checkdigit($cardnumber $nounique);
Takes a card number, computes its check digit, and compares it to the checkdigit at the end of $cardnumber. Returns a true value iff $cardnumber has a valid check digit.
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