[Validator] Simplified and explained the LuhnValidator
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@ -39,28 +39,48 @@ class LuhnValidator extends ConstraintValidator
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return;
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}
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/**
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* need to work with strings only because long numbers are treated as floats and don't work with strlen
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*/
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if (!is_string($value)) {
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// Work with strings only, because long numbers are represented as floats
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// internally and don't work with strlen()
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if (!is_string($value) && !(is_object($value) && method_exists($value, '__toString'))) {
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throw new UnexpectedTypeException($value, 'string');
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}
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if (!is_numeric($value)) {
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$this->context->addViolation($constraint->message);
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$value = (string) $value;
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if (!ctype_digit($value)) {
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$this->context->addViolation($constraint->message, array(
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'{{ value }}' => $value,
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));
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return;
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}
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$checkSum = 0;
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$length = strlen($value);
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$oddLength = $length % 2;
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for ($sum = 0, $i = $length - 1; $i >= 0; $i--) {
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$digit = (int) $value[$i];
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$sum += (($i % 2) === $oddLength) ? array_sum(str_split($digit * 2)) : $digit;
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// Starting with the last digit and walking left, add every second
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// digit to the check sum
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// e.g. 7 9 9 2 7 3 9 8 7 1 3
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// ^ ^ ^ ^ ^ ^
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// = 7 + 9 + 7 + 9 + 7 + 3
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for ($i = $length - 1; $i >= 0; $i -= 2) {
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$checkSum += $value{$i};
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}
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if ($sum === 0 || ($sum % 10) !== 0) {
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$this->context->addViolation($constraint->message);
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// Starting with the second last digit and walking left, double every
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// second digit and add it to the check sum
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// For doubles greater than 9, sum the individual digits
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// e.g. 7 9 9 2 7 3 9 8 7 1 3
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// ^ ^ ^ ^ ^
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// = 1+8 + 4 + 6 + 1+6 + 2
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for ($i = $length - 2; $i >= 0; $i -= 2) {
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$checkSum += array_sum(str_split($value{$i} * 2));
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}
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if (0 === $checkSum || 0 !== $checkSum % 10) {
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$this->context->addViolation($constraint->message, array(
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'{{ value }}' => $value,
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));
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}
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}
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}
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