Delete all products from magent.

deleteAll.php

<?php
/**
 * Created by PhpStorm.
 * User: Admin
 * Date: 20. 06. 2015
 * Time: 11:48
 */

ini_set('display_errors', 1);
umask(0);
require_once( getcwd(). '/app/Mage.php');
Mage::app()->setCurrentStore(Mage_Core_Model_App::ADMIN_STORE_ID);

$write_api = Mage::getSingleton('core/resource')->getConnection('core_write');
$write_api->query('DELETE FROM `catalog_product_entity`');