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Posted By

Scooter on 04/18/09


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Social Security Numbers

 / Published in: PHP
 

URL: http://reusablecode.blogspot.com/2009/04/social-security-numbers.html

Format and validate social security numbers. Be aware of the legal issues surrounding the collection of these private numbers.

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  1. <?php
  2.     /*
  3.     PHP Library - Social Security Number-related functions
  4.     
  5.     Copyright (c) 2009, reusablecode.blogspot.com; some rights reserved.
  6.     
  7.     This work is licensed under the Creative Commons Attribution License. To view
  8.     a copy of this license, visit http://creativecommons.org/licenses/by/3.0/ or
  9.     send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California
  10.     94305, USA.
  11.     */
  12.  
  13.     // Format a Social Security Number.
  14.     function formatSSN($ssn)
  15.     {
  16.         if (eregi("^(\d{3})\-?(\d{2})\-?(\d{4})$", $ssn))
  17.         {
  18.             return eregi_replace("^(\d{3})\-?(\d{2})\-?(\d{4})$", "$1-$2-$3", $ssn);
  19.         }
  20.         else
  21.         {
  22.             die("Input cannot be formatted as a social security number.");
  23.         }
  24.     }
  25.  
  26.     // Validate a Social Security Number.
  27.     function isValidSSN($ssn)
  28.     {
  29.         $result = eregi("^\d{3}\-?\d{2}\-?\d{4}$", $ssn) ? true : false;
  30.  
  31.         /*
  32.         None of the digit groups can be all zeros.
  33.         Area number 666 is unassigned.
  34.         Numbers from 987-65-4320 to 987-65-4329 are reserved for use in advertisements.
  35.         Many SSNs have been invalidated by use in advertising.
  36.         */
  37.         if (eregi("^((000|666)\-?\d{2}\-?\d{4}|\d{3}\-?00\-?\d{4}|\d{3}\-?\d{2}\-?0000|987\-?65\-?432\d{1}|042\-?10\-?3580|062\-?36\-?0749|078\-?05\-?1120|095\-?07\-?3645|128\-?03\-?6045|135\-?01\-?6629|141\-?18\-?6941|165\-?(16|18|20|22|24)\-?7999|189\-?09\-?2294|212\-?09\-?(7694|9999|219\-?09\-?9999|306\-?30\-?2348|308\-?12\-?5070|468\-?28\-?8779|549\-?24\-?1889)$", $ssn)
  38.         {
  39.             $result = false;
  40.         }
  41.  
  42.         // Numbers above 772 are currently unassigned.
  43.         if (substr($ssn, 0, 3) > 772)
  44.         {
  45.             $result = false;
  46.         }
  47.  
  48.         return $result;
  49.     }
  50.  
  51. ?>

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