Masking a social security number

Question

I have a Social Security number showing up like this:

1234567890

I want to show it like this:

###-##-7890

So, basically, masking the first five digits and entering hyphens.

How can I do that? Thanks.

Answer 1

$number = '###-##-'.substr($ssn, -4);

just make the starting part a string and concat that with the last 4 digits. Either that or do it in the query itself like SELECT CONCAT('###-##-', RIGHT(ssn, 4)) FROM customer...

Answer 2

This will take the last 4 numbers and mask the rest:

$number = "1234567890";
$number = "###-##-" . substr($number, -4);