< ?php
// Here we do some intelligent search engine 404 checking
// This allows us to show some links to possible relevant content
 
if(strlen($_SERVER['HTTP_REFERER']) > 0) {
 
    // We have a referer value somewhere
    // Look for a search engine query
    $engines = array('google.co', 'looksmart.co', 'altavista.co', 'msn.co', 'yahoo.co');
    for($I = 0; $I < count($engines); $I++) {
        $found = strstr($_SERVER['HTTP_REFERER'], $engines[$I]);
    }
    if(strlen($found) > 0) {
 
        // We have a search engine..
        // Split the referal up to get query used
        $query = explode('?', $found);
        $parts = explode('&', $query[1]);
        $part_count = count($parts);
 
        // Find specific search terms based on differing search engines
        $style = array('q=', 'p=', 'ask=', 'key=');
        $style_count = count($style);
 
        // start by looping through the URL parts
        for($s = 0; $s < $part_count; $s++) {
 
            // Match url parts against search query types
            for($t = 0; $t < $style_count; $t++) {
                $terms = strstr($parts[$s], $style[$t]);
                if($terms == true) {
 
                    // finish loop as we've found what we need
                    $s += $part_count;
                    $t += $style_count;
                    $terms = explode('=', $terms);
                }
            }
        }
        // Search terms to echo in the search box
        $new_search = str_replace('+', ' ', $terms[1]);
    }
}
?>