class.php

<?php
class Conectar
{
    public static function con()
    {
        $conexion = mysql_connect("localhost","root","");
        mysql_query("SET NAMES 'UTF-8'");
        mysql_select_db("el_blog");
        return $conexion;
    }
}

class Buscador
{
    private $busqueda=array();

    public function buscar()
    {
        $busqueda = mysql_real_escape_string(addslashes($_GET['s']));
        /*consulta fulltext con el motor myisam
        $query = "SELECT *, MATCH(titulo, cuerpo) AGAINST ('$busqueda') as buscado
              FROM posts
              WHERE MATCH(titulo, cuerpo)
              AGAINST ('$busqueda')
              ORDER BY buscado DESC";
        */
        //consulta con like y el motor innodb
        $query = "SELECT * FROM posts WHERE titulo like '%".$busqueda."%' OR cuerpo like '%".$busqueda."%';";
        $res = mysql_query($query,Conectar::con());
        while ($reg=mysql_fetch_assoc($res))
        {
            $this->busqueda[] = $reg;
        }
        return $this->busqueda;
    }
}