Help Me auto directed keyword search engine

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PHP

I want to get keywords that you can find on my website

example me code

pcboxsearch.class.php

<?php

class search_keywords
{
    var $referer;
    var $search_engine;
    var $keys;
    var $sep;
    function search_keywords()
    {
        $this->referer = '';
        $this->sep = '';
        if ($_SERVER['HTTP_REFERER'] OR $_ENV['HTTP_REFERER'])
        {
            $this->referer = urldecode(($_SERVER['HTTP_REFERER'] ? $_SERVER['HTTP_REFERER'] : $_ENV['HTTP_REFERER']));
            $this->sep = (eregi('(\?q=|\?qt=|\?p=)', $this->referer)) ? '\?' : '\&';
        }
    }

    function get_keys()
    {
        if (!empty($this->referer))
        {
            if (eregi('www\.google', $this->referer))
            {
                // Google
                preg_match("#{$this->sep}q=(.*?)\&#si", $this->referer, $this->keys);
                $this->search_engine = 'Google';
            }
            else if (eregi('(yahoo\.com|search\.yahoo)', $this->referer))
            {
                // Yahoo
                preg_match("#{$this->sep}p=(.*?)\&#si", $this->referer, $this->keys);
                $this->search_engine = 'Yahoo';
            }
            else if (eregi('search\.msn', $this->referer))
            {
                // MSN
                preg_match("#{$this->sep}q=(.*?)\&#si", $this->referer, $this->keys);
                $this->search_engine = 'MSN';
            }
            else if (eregi('www\.alltheweb', $this->referer))
            {
                // AllTheWeb
                preg_match("#{$this->sep}q=(.*?)\&#si", $this->referer, $this->keys);
                $this->search_engine = 'AllTheWeb';
            }
            else if (eregi('(looksmart\.com|search\.looksmart)', $this->referer))
            {
                // Looksmart
                preg_match("#{$this->sep}qt=(.*?)\&#si", $this->referer, $this->keys);
                $this->search_engine = 'Looksmart';
            }
            else if (eregi('(askjeeves\.com|ask\.com)', $this->referer))
            {
                // AskJeeves
                preg_match("#{$this->sep}q=(.*?)\&#si", $this->referer, $this->keys);
                $this->search_engine = 'AskJeeves';
            }
            else
            {
                $this-> keys = 'Not available';
                $this->search_engine = 'Unknown';
            }
            return array(
                $this->referer,
                (!is_array($this->keys) ? $this->keys : $this->keys[1]),
                $this->search_engine
            );
        }
        return array();
    }
}

?>

index.php

<?php
require_once('./pcboxsearch.class.php');
$keys =& new search_keywords();
$keys = $keys->get_keys();
$url ='a href="http://www.pcboxsearch.com/search.php?q="';
if (count($keys))
{
    echo "You're directed to this page from <b>$keys[2]</b> search engine, within Keywords <b>$url$keys[1]</a> </b> If   you Like Pcboxsearch Found You search<br>";
}
?>

output code index.php

You're directed to this page from "google" search engine, within Keywords "code poject" If you Like Pcboxsearch Found You search


I've tried this keyword not respont

$url ='href="http://www.pcboxsearch.com/search.php?q='+ $keys[1];

questions

how to combine keywords found make url

example, if found "projec code" becomes url = http://www.pcboxsearch.com/search.php?q=code projec

because me code not response keyword "http://www.pcboxsearch.com/search.php?q="

Can you help me where do I join as a url into my search engine