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   1  <?php
   2  //
   3  // +----------------------------------------------------------------------+
   4  // | PHP Version 4                                                        |
   5  // +----------------------------------------------------------------------+
   6  // | Copyright (c) 1997-2002 The PHP Group                                |
   7  // +----------------------------------------------------------------------+
   8  // | This source file is subject to version 2.0 of the PHP license,       |
   9  // | that is bundled with this package in the file LICENSE, and is        |
  10  // | available at through the world-wide-web at                           |
  11  // | http://www.php.net/license/2_02.txt.                                 |
  12  // | If you did not receive a copy of the PHP license and are unable to   |
  13  // | obtain it through the world-wide-web, please send a note to          |
  14  // | license@php.net so we can mail you a copy immediately.               |
  15  // +----------------------------------------------------------------------+
  16  // | Authors: Martin Jansen <mj@php.net>                                  |
  17  // |          Guido Haeger <gh-lists@ecora.de>                            |
  18  // +----------------------------------------------------------------------+
  19  //
  20  // $Id: CheckIP.php,v 1.5 2002/08/17 09:41:24 mj Exp $
  21  
  22  /**
  23  * Class to validate the syntax of IPv4 adresses
  24  *
  25  * Usage:
  26  *   <?php
  27  *   require_once "Net/CheckIP.php";
  28  *     
  29  *   if (Net_CheckIP::check_ip("your_ip_goes_here")) {
  30  *       // Syntax of the IP is ok
  31  *   }
  32  *   ?>
  33  *
  34  * @author  Martin Jansen <mj@php.net>
  35  * @author  Guido Haeger <gh-lists@ecora.de>
  36  * @package Net_CheckIP
  37  * @version 1.1
  38  * @access  public
  39  */
  40  class Net_CheckIP
  41  {
  42  
  43      /**
  44      * Validate the syntax of the given IP adress
  45      *
  46      * This function splits the IP address in 4 pieces
  47      * (separated by ".") and checks for each piece
  48      * if it's an integer value between 0 and 255.
  49      * If all 4 parameters pass this test, the function
  50      * returns true.
  51      *
  52      * @param  string $ip IP adress
  53      * @return bool       true if syntax is valid, otherwise false
  54      */
  55      function check_ip($ip)
  56      {
  57          $oct = explode('.', $ip);
  58          if (count($oct) != 4) {
  59              return false;
  60          }
  61  
  62          for ($i = 0; $i < 4; $i++) {
  63              if (!is_numeric($oct[$i])) {
  64                  return false;
  65              }
  66  
  67              if ($oct[$i] < 0 || $oct[$i] > 255) {
  68                  return false;
  69              }
  70          }
  71  
  72          return true;
  73      }
  74  }
  75  ?>