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Use ctype_digit() instead of is_numeric() so values such as decimal points, which is_numeric() accepts, can no longer reach the Luhn check. Previously a string like '5351367.37861108' passed validation and the Luhn indexer triggered an 'Undefined array key' warning on non-digit characters.
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Description
valid_cc_number()usedis_numeric()to reject non-numeric values before the Luhn check.is_numeric()accepts strings thatctype_digit()rejects — e.g. decimal points (5351367.37861108), scientific notation, and sign characters — so such input:$sumTable[...][$number[$i]]with a non-digit index, triggering anUndefined array keywarning/ErrorException.This PR switches to
ctype_digit()(already used elsewhere insystem/, e.g.FormatRules::valid_numeric).Checks
vendor/bin/phpunit tests/system/Validation/CreditCardRulesTest.php tests/system/Validation/StrictRules/CreditCardRulesTest.php→ OK (456 tests)decimal_point_visaanddecimal_point_mastercardthat error out under the oldis_numericlogic and pass after the fix.