Question

How to mask a number with stars except the first 6 and the last 4 digits in PHP

Answer 1

function maskNumberWithStarsExceptFirstSixAndLastFour($cardNumber) {
    $first6Digits = substr($cardNumber, 0, 6);
    $last4Digits = substr($cardNumber, -4);
    
    $requiredMask = str_repeat("*", strlen($cardNumber) - strlen($first6Digits) - strlen($last4Digits));
    
    return $first6Digits . $requiredMask . $last4Digits;
}

$cardNumber = "9003125334656789";

$maskedNumber = maskNumberWithStarsExceptFirstSixAndLastFour($cardNumber);

echo $maskedNumber;




/*
run:

900312******6789

*/

 

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