<?php

require_once($_SERVER['DOCUMENT_ROOT']."/config.php");

if($_SESSION['id'] && isset($_GET['pct']) && is_numeric($_GET['pct'])) {

    foreach($_SESSION['checked'] as $ts) {
        $sql10="SELECT * FROM objects WHERE use_in_advert = 1 AND id_add_user = $_SESSION[id] AND id = $ts";
        $rez_10=mysql_query($sql10);
        if (mysql_num_rows($rez_10) > 0) {
            $obj = mysql_fetch_assoc($rez_10);

            $newPrice = $obj['stoim'] - $obj['stoim'] * ($_GET['pct'] / 100);

            $sqlUpd="UPDATE objects SET stoim = '$newPrice' WHERE use_in_advert = 1 AND id_add_user = $_SESSION[id] AND id = $ts";
            mysql_query($sqlUpd);
        }
    }
}