replacing first few digits with #

I want to hide t开发者_JAVA技巧he first 6 digits of social security I have them like 123-456-7890

I want to show ###-###-7890

how can I do that thanks

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$ssn = '123-456-7890';    
$ssn = '###-###-'.substr ($ssn , 8);

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You can use the substr method to get the rightmost 4 characters from the SSN using a negative length:

$ssn = '111-222-4567';
$ssn_obscured = '###-###-' . substr($ssn, -4);

See http://us.php.net/substr for more information on the method.