PHP - Browser Detection (suggestion)

I have a need to create a form that will get info from a mysql table, show that info, two fields one of which I want to be a checkbox that will need to update the table with either a 0 or a 1.  I will later use that info.  I have searched all over and haven't found what I am looking for.  I can find tutorials for creating checkboxes but nothing what I need / want

I use this script to detect a browser IP, however it doesn't work with IPv6.

http://phptutorial.info/iptocountry/the_script.html

Any ideas what is required to make it work with both IPv4 & IPv6?

Thanks

Hi,
I have the below code to show the suggestion text, now it’s showing all the words which contain the letter when I first type in the text field. For example, If I typed the letter “a”, it should show only the words which start with the letter “a”, now it’s showing all the words which contain the letter “a” in the suggestion. Below is my code. Thanks in advance.

<?php
$xmlDoc=new DOMDocument();
$xmlDoc->load("links.xml");

$x=$xmlDoc->getElementsByTagName('link');

//get the q parameter from URL
$q=$_GET["q"];

//lookup all links from the xml file if length of q>0
if (strlen($q)>0) {
  $hint="";
  for($i=0; $i<($x->length); $i++) {
    $y=$x->item($i)->getElementsByTagName('title');
    $z=$x->item($i)->getElementsByTagName('url');
    if ($y->item(0)->nodeType==1) {
      //find a link matching the search text
      if (stristr($y->item(0)->childNodes->item(0)->nodeValue,$q)) {
        if ($hint=="") {
          $hint="<a href='" .
          $z->item(0)->childNodes->item(0)->nodeValue .
          "' target='_blank'>" .
          $y->item(0)->childNodes->item(0)->nodeValue . "</a>";
        } else {
          $hint=$hint . "<br /><a href='" .
          $z->item(0)->childNodes->item(0)->nodeValue .
          "' target='_blank'>" .
          $y->item(0)->childNodes->item(0)->nodeValue . "</a>";
        }
      }
    }
  }
}

// Set output to "no suggestion" if no hint was found
// or to the correct values
if ($hint=="") {
  $response="no suggestion";
} else {
  $response=$hint;
}

//output the response
echo $response;
?>