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

If you wish to show only last 4 digits, here is a dynamic way. Works with both credit cards, ACH numbers or anything:

https://gist.github.com/khoipro/815ea292e2e87e10771474dc2ef401ef

    $variable = '123123123';
    $length = strlen($variable);
    $output = substr_replace($variable, str_repeat('X', $length - 4), 0, $length - 4);
    echo $output;