Mask credit card number in PHP

Question

I have credit card number which I want to mask as below:

$cc = 1234123412341234

echo cc_masking($cc)

1234XXXXXXXX1234

function cc_masking($number) {.....}         


        

Answer 1

<?php
echo 'XXXX-XXXX-XXXX-'.substr($cc,-4);
?>

Answer 2

You can use substr_replace

$var = '1234123412341234';
$var = substr_replace($var, str_repeat("X", 8), 4, 8);
echo $var;

Output

1234XXXXXXXX1234

Answer 3

This should work using substr:

function ccMasking($number, $maskingCharacter = 'X') {
    return substr($number, 0, 4) . str_repeat($maskingCharacter, strlen($number) - 8) . substr($number, -4);
}

Answer 4

Not the elegant way but it works

<?php
     $cc = "1234123412341234";
     function cc_masking($number) {
     $int_first = 4;
     $int_last = 4;
     $chars = strlen($number);
     $repeater = "x";
     $repeates = $chars-$int_first-$int_last;
     // echo "<p>Org: $number</p>";
     $mask = substr($number,0,4).str_repeat($repeater,$repeates).substr($cc,-4);
     // echo "<p>Mask: $mask";
         return $mask;
      }
     echo cc_masking($cc);
  ?>

Answer 5

I was looking for some code similar. So I found the code below. I hope can help.

function mask($val, $mask)
{
    $maskared = '';

    $k = 0;

    for ($i = 0; $i <= strlen($mask) - 1; $i++) {
        if ($mask[$i] == '#') {
            if (isset($val[$k]))
                $maskared .= $val[$k++];
        } else {
            if (isset($mask[$i]))
                $maskared .= $mask[$i];
        }
    }

    return $maskared;
}

Sample:

echo mask(11111111111, "###.###.###-##"); // 111.111.111-11
echo mask(11111111111, "#####-###"); // 111111-111
echo mask(11111111111, anything); // 111111-111

Answer 6

My 5 cents.

Examples:
371449635398431 => XXX-XXXX-XXXX-8431
4111111111111111 => XXXX-XXXX-XXXX-1111

public function maskCreditCardNumber($cc, $maskFrom = 0, $maskTo = 4, $maskChar = 'X', $maskSpacer = '-')
{
    // Clean out
    $cc       = str_replace(array('-', ' '), '', $cc);
    $ccLength = strlen($cc);

    // Mask CC number
    if (empty($maskFrom) && $maskTo == $ccLength) {
        $cc = str_repeat($maskChar, $ccLength);
    } else {
        $cc = substr($cc, 0, $maskFrom) . str_repeat($maskChar, $ccLength - $maskFrom - $maskTo) . substr($cc, -1 * $maskTo);
    }

    // Format
    if ($ccLength > 4) {
        $newCreditCard = substr($cc, -4);
        for ($i = $ccLength - 5; $i >= 0; $i--) {
            // If on the fourth character add the mask char
            if ((($i + 1) - $ccLength) % 4 == 0) {
                $newCreditCard = $maskSpacer . $newCreditCard;
            }

            // Add the current character to the new credit card
            $newCreditCard = $cc[$i] . $newCreditCard;
        }
    } else {
        $newCreditCard = $cc;
    }

    return $newCreditCard;
}