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Posted By

Scooter on 07/26/08


Tagged

regular expressions


Versions (?)


isValidIP

Published in: PHP 

URL: http://reusablecode.blogspot.com/2008/07/isvalidip.html

Plain TextExpand 
  1. <?php
  2.     /*
  3.     Copyright (c) 2008, reusablecode.blogspot.com; some rights reserved.
  4.     
  5.     This work is licensed under the Creative Commons Attribution License. To view
  6.     a copy of this license, visit http://creativecommons.org/licenses/by/3.0/ or
  7.     send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California
  8.     94305, USA.
  9.     */
  10.  
  11.     // Validate an IP address.
  12.     function isValidIP($ip)
  13.     {
  14.         $pattern = "/^([1]?\d{1,2}|2[0-4]{1}\d{1}|25[0-5]{1})(\.([1]?\d{1,2}|2[0-4]{1}\d{1}|25[0-5]{1})){3}$/";
  15.         return (preg_match($pattern, $ip) > 0) ? true : false;
  16.     }
  17. ?>

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