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943天前// This function will take a credit card number and check to make sure it |
// contains the right amount of digits and uses the Luhn Algorithm to |
// weed out made up numbers |
function validateCreditcard_number($credit_card_number) |
{ |
// Get the first digit |
$firstnumber = substr($credit_card_number, 0, 1); |
// Make sure it is the correct amount of digits. Account for dashes being present. |
switch ($firstnumber) |
{ |
case 3: |
if (!preg_match('/^3\d{3}[ \-]?\d{6}[ \-]?\d{5}$/', $credit_card_number)) |
{ |
return 'This is not a valid American Express card number'; |
} |
break; |
case 4: |
if (!preg_match('/^4\d{3}[ \-]?\d{4}[ \-]?\d{4}[ \-]?\d{4}$/', $credit_card_number)) |
{ |
return 'This is not a valid Visa card number'; |
} |
break; |
case 5: |
if (!preg_match('/^5\d{3}[ \-]?\d{4}[ \-]?\d{4}[ \-]?\d{4}$/', $credit_card_number)) |
{ |
return 'This is not a valid MasterCard card number'; |
} |
break; |
case 6: |
if (!preg_match('/^6011[ \-]?\d{4}[ \-]?\d{4}[ \-]?\d{4}$/', $credit_card_number)) |
{ |
return 'This is not a valid Discover card number'; |
} |
break; |
default: |
return 'This is not a valid credit card number'; |
} |
// Here's where we use the Luhn Algorithm |
$credit_card_number = str_replace('-', '', $credit_card_number); |
$map = array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, |
0, 2, 4, 6, 8, 1, 3, 5, 7, 9); |
$sum = 0; |
$last = strlen($credit_card_number) - 1; |
for ($i = 0; $i <= $last; $i++) |
{ |
$sum += $map[$credit_card_number[$last - $i] + ($i & 1) * 10]; |
} |
if ($sum % 10 != 0) |
{ |
return 'This is not a valid credit card number'; |
} |
// If we made it this far the credit card number is in a valid format |
return 'This is a valid credit card number'; |
} |
echo validateCreditcard_number('4111-1111-1111-1111'); // This is a valid credit card number |
echo validateCreditcard_number('4111-1111-1111-1112'); // This is not a valid credit card number |
echo validateCreditcard_number('5558-545f-1234'); // This is not a valid MasterCard card number |
echo validateCreditcard_number('9876-5432-1012-3456'); // This is not a valid credit card number |
