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@ibrahimlawal
Last active September 10, 2019 11:44
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Validate card numbers using Regex and a Luhn Check
<?php
class Operations {
const PATTERN_AMERICAN_EXPRESS = "/^3[47][0-9]{13}$/";
const PATTERN_DINERS_CLUB = "/^3(?:0[0-5]|[68][0-9])[0-9]{11}$/";
const PATTERN_DISCOVER = "/^6(?:011|5[0-9]{2})[0-9]{12}$/";
const PATTERN_JCB = "/^(?:2131|1800|35[0-9]{3})[0-9]{11}$/";
const PATTERN_MASTERCARD = "/^(?:5[1-5][0-9]{2}|222[1-9]|22[3-9][0-9]|2[3-6][0-9]{2}|27[01][0-9]|2720)[0-9]{12}$/";
const PATTERN_VERVE = "/^((506(0|1))|(507(8|9))|(6500))[0-9]{12,15}$/";
const PATTERN_VISA = "/^4[0-9]{12}(?:[0-9]{3})?$/";
public function can_be_string($var)
{
return $var === null || is_scalar($var) || (is_object($var) && method_exists($var, '__toString'));
}
public function is_valid_luhn($number)
{
$sumTable = [
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
[0, 2, 4, 6, 8, 1, 3, 5, 7, 9],
];
$sum = 0;
$flip = 0;
for ($i = strlen($number) - 1; $i >= 0; $i--) {
$sum += $sumTable[$flip++ & 0x1][$number[$i]];
}
return $sum % 10 === 0;
}
public function cardType($number)
{
$cardtype = 'Unknown';
// only values that can be converted to string can be checked
if (!$this->can_be_string($number)) {
return $cardtype;
}
$number = strval($number);
$number = preg_replace("/[^0-9]/", "", $number);
// only non-zero length strings can be checked
if (!strlen($number)) {
return $cardtype;
}
if (preg_match(Operations::PATTERN_MASTERCARD, $number)) {
$cardtype = 'mastercard';
} elseif (preg_match(Operations::PATTERN_VERVE, $number)) {
$cardtype = 'verve';
} elseif (preg_match(Operations::PATTERN_VISA, $number)) {
$cardtype = 'visa';
} elseif (preg_match(Operations::PATTERN_DINERS_CLUB, $number)) {
$cardtype = 'Diners Club';
} elseif (preg_match(Operations::PATTERN_DISCOVER, $number)) {
$cardtype = 'Discover';
} elseif (preg_match(Operations::PATTERN_AMERICAN_EXPRESS, $number)) {
$cardtype = 'American Express';
} elseif (preg_match(Operations::PATTERN_JCB, $number)) {
$cardtype = 'JCB';
}
$cardtype = $this->is_valid_luhn($number) ? $cardtype : 'Unknown';
return $cardtype;
}
}
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