Revision: 61494
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at December 18, 2012 08:55 by quixrick
Initial Code
// SET THE CARD NUMBER TO BE TESTED
$card_number = '';
// TEST THE CARD NUMBER
if (is_card_fake($card_number)) {
print "It's Possible This Card Is Valid";
}
else {
print "Card Cannot Possibly Be Valid.";
}
function is_card_fake($card_number) {
$number_sum = 0;
// SPLIT THE CARD NUMBER INTO 16 INDIVIDUAL DIGITS
$digits = preg_split('//', $card_number, -1, PREG_SPLIT_NO_EMPTY);
// LOOP THROUGH THE DIGITS
for ($i = 0; $i < strlen($card_number); $i++) {
// CHECK TO SEE IF WE SHOULD DOUBLE THE NUMBER OR JUST ADD IT
if ($i % 2 == 0) {
// DOUBLE THE DIGITS
$double_number = $digits[$i] * 2;
// IF THE DOUBLED NUMBER IS 10 OR MORE, SPLIT IT APART AND ADD EACH PIECE TO THE SUM
if ($double_number > 9) {
$doubled_digits = preg_split('//', $double_number, -1, PREG_SPLIT_NO_EMPTY);
$number_sum += $doubled_digits[0] + $doubled_digits[1];
}
// OTHERWISE, JUST ADD THE DOUBLED NUMBER TO THE SUM
else {
$number_sum += $double_number;
}
}
// WE DO NOT HAVE TO DOUBLE THESE DIGITS; JUST ADD THEM TO THE SUM
else {
$number_sum += $digits[$i];
}
}
// CHECK TO SEE IF THE SUM OF THE DIGITS CAN BE DIVIDED BY 10
if ($number_sum % 10 == 0) {
return true;
}
else {
return false;
}
}
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Initial Description
This function checks to see if a credit card number cannot possibly be valid. Note: It does NOT check if a card is valid. A card number can pass this check and still be invalid, but this script will identify card numbers that cannot possibly be valid.
Initial Title
Fake Credit Card Checker
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PHP