motore (motorino) di ricerca

<?php

$key = $_POST['key'];
class Search 
{ 
    #CONFIGURA 
    #Parametri ricerca 
    var $fulltext = "author,title"; 
    var $table = "prova"; 
    #parametri db 
    var $host =  "";
    var $password = "";
    var $user = "";
    var $db = "";
    #
    var $pf = "f"; 
    #
    #
    var $key; 
    var $conn; 
    var $res; 
    var $total; 
     
        function Search($key) 
        { 
            $this->key = $key; 
        } 

        function DbConnectAndSelect() 
        { 
            $this->conn = @mysql_connect($this->host, $this->user, $this->password) or die ("Impossibile stabilire una connessione con il server.<br>MySql risponde: " . mysql_error() . "<br>Il codice errore é:" . mysql_errno()); 
             
            @mysql_select_db($this->db, $this->conn) or die ("Impossibile connettersi al database $this->db.<br>MySql risponde: " . mysql_error() . "<br>Il codice errore é:" . mysql_errno()); 
				// 
mysql_set_charset('utf8'); // 
        } 

        function GetResource() 
        { 
            $this->DbConnectAndSelect(); 
            $sql = "SELECT *, MATCH($this->fulltext) AGAINST('$this->key' IN BOOLEAN MODE) AS tot FROM $this->table WHERE MATCH($this->fulltext) AGAINST('$this->key' IN BOOLEAN MODE) ORDER BY tot DESC"; 
            $this->res = mysql_query($sql, $this->conn); 
             
        } 
         
        function CalcScore($tot) 
        { 
            switch($this->pf) 
            { 
                case "f": 
                $key_array = explode(" ", $this->key); 
                $this->total = count($key_array); 
                return $tot . " / " . $this->total; 
                break; 
                case "p": 
                $key_array = explode(" ", $this->key); 
                $this->total = count($key_array); 
                $output = intval($tot / $this->total * 100) . "%"; 
                return $output; 
                break; 
                default: 
                $key_array = explode(" ", $this->key); 
                $this->total = count($key_array); 
                return $tot . " / " . $this->total; 
                 
            } 
        } 

}

$search = new Search($key); 
$search->GetResource(); 

   $id=$row['author'];
   $author=$row['title'];





 while ($row = mysql_fetch_array($search->res)) 
 {   
echo "<div>";
echo "<br>";
echo "<font face=\"Arial\" size=\"2\">";
echo "<table width=\"640\" align=\"justify\" bgcolor=\"#FAFAD2\" cellpadding=\"3\" >";
echo "<tr>";
echo "<td>";
echo "<b>";
echo "Id:";
echo "</b>";
echo "&nbsp;";
echo $row['author'];
echo "&nbsp;";
echo $row['title'];
echo "</td>";
echo "</tr>";
echo "</table>";
echo "</div>";

}



 
 ?>