Как сделать поиск по названию категорий?

<?php
/*
=====================================================
 DataLife Engine - by SoftNews Media Group 
-----------------------------------------------------
 http://dle-news.ru/
-----------------------------------------------------
 Copyright (c) 2004,2013 SoftNews Media Group
=====================================================
 Данный код защищен авторскими правами
=====================================================
 Файл: search.php
-----------------------------------------------------
 Назначение: Быстрый поиск
=====================================================
*/

@error_reporting ( E_ALL ^ E_WARNING ^ E_NOTICE );
@ini_set ( 'display_errors', true );
@ini_set ( 'html_errors', false );
@ini_set ( 'error_reporting', E_ALL ^ E_WARNING ^ E_NOTICE );

define( 'DATALIFEENGINE', true );
define( 'ROOT_DIR', substr( dirname(  __FILE__ ), 0, -12 ) );
define( 'ENGINE_DIR', ROOT_DIR . '/engine' );

include ENGINE_DIR . '/data/config.php';

if( $config['http_home_url'] == "" ) {
    
    $config['http_home_url'] = explode( "engine/ajax/search.php", $_SERVER['PHP_SELF'] );
    $config['http_home_url'] = reset( $config['http_home_url'] );
    $config['http_home_url'] = "http://" . $_SERVER['HTTP_HOST'] . $config['http_home_url'];

}

require_once ENGINE_DIR . '/classes/mysql.php';
require_once ENGINE_DIR . '/data/dbconfig.php';
require_once ENGINE_DIR . '/modules/functions.php';

dle_session();

require_once ENGINE_DIR . '/modules/sitelogin.php';
require_once ROOT_DIR . '/language/' . $config['langs'] . '/website.lng';
if( ! $is_logged ) $member_id['user_group'] = 5;

//################# Определение групп пользователей
$user_group = get_vars( "usergroup" );

if( ! $user_group ) {
    $user_group = array ();
    
    $db->query( "SELECT * FROM " . USERPREFIX . "_usergroups ORDER BY id ASC" );
    
    while ( $row = $db->get_row() ) {
        
        $user_group[$row['id']] = array ();
        
        foreach ( $row as $key => $value ) {
            $user_group[$row['id']][$key] = stripslashes($value);
        }
    
    }
    set_vars( "usergroup", $user_group );
    $db->free();
}

if( !$config['fast_search'] OR !$user_group[$member_id['user_group']]['allow_search'] ) die( "error" );

//####################################################################################################################
//                    Определение категорий и их параметры
//####################################################################################################################
$cat_info = get_vars( "category" );

if( ! is_array( $cat_info ) ) {
    $cat_info = array ();
    
    $db->query( "SELECT * FROM " . PREFIX . "_category ORDER BY posi ASC" );
    while ( $row = $db->get_row() ) {
        
        $cat_info[$row['id']] = array ();
        
        foreach ( $row as $key => $value ) {
            $cat_info[$row['id']][$key] = stripslashes( $value );
        }
    
    }
    set_vars( "category", $cat_info );
    $db->free();
}

$query = $db->safesql( htmlspecialchars ( trim(  strip_tags (convert_unicode( $_POST['query'], $config['charset'] ) ) ), ENT_QUOTES, $config['charset']) );

if( $query == "" ) die();

$buffer = "";

$db->query("SELECT id, name, alt_name FROM " . PREFIX . "_category WHERE name LIKE '%{$query}%' OR alt_name LIKE '%{$query}%' ORDER by id DESC LIMIT 5");

while($row = $db->get_row()){

    $row['id'] = intval( $row['id'] );

    $buffer .= "<a href=\"" . $config['http_home_url'] . $cat_info[$row['id']]['alt_name'] . "/\"><span class=\"searchheading\">" . $cat_info[$row['id']]['name'] . "</span>";

}

if ( !$buffer ) $buffer .= "<span class=\"notfound\">{$lang['related_not_found']}</span>";

$buffer .= '<span class="seperator"><a href="'.$config['http_home_url'].'?do=search&amp;mode=advanced&amp;subaction=search&amp;story='.$query.'">'.$lang['s_ffullstart'].'</a></span><br class="break" />';
        
@header( "Content-type: text/html; charset=" . $config['charset'] );
echo $buffer;

?>