PHP site pinger

ping.php

<?php

$url = $argv[1];

$cl = curl_init();

curl_setopt($cl, CURLOPT_URL, $url);
curl_setopt($cl, CURLOPT_USERAGENT, md5(rand(6713678, 8746316834)));
//curl_setopt($cl, CURLOPT_RETURNTRANSFER, true);
//curl_setopt($cl, CURLOPT_POSTFIELDS, $post);

curl_exec($cl);
curl_close($cl);
exit(0);

site_pinger.php

<?php

/**
 * PHP site pinger
 *
 * Use with caution. This script can take massive amount of RAM. You can use it
 * as visit bot, to raise votes or DDOS some website. This script is intended to
 * be extended by your needs, having only the basic abilities. In ping.php file
 * you can easily uncomment line for adding form data.
 *
 * PHP version 5
 *
 * LICENSE: This source file is subject to version 3.01 of the PHP license
 * that is available through the world-wide-web at the following URI:
 * http://www.php.net/license/3_01.txt.  If you did not receive a copy of
 * the PHP License and are unable to obtain it through the web, please
 * send a note to license@php.net so we can mail you a copy immediately.
 *
 * @author     Raito Akehanareru <raito.akehanareru@gmail.com>
 * @copyright  1997-2005 The PHP Group
 * @license    http://www.php.net/license/3_01.txt  PHP License 3.01
 * @version    1.0.0
 * @link
 */
$repeat = 50; // How many times?
$wait = 0.1; // Time in seconds between each ping
$url = 'http://www.url.com/';

for ($r = 1; $r <= $repeat; $r++)
{
    usleep($wait * 1000000);
    shell_exec('php ping.php ' . $url . ' >log.txt 2>log.txt &');
    print('[' . date('H:i:s') . '] - ' . '[VOTED: ' . $r . 'x times]' . PHP_EOL);
}
print('-----------------------------------------------------' . PHP_EOL);
print('- DONE -' . PHP_EOL);
exit(0);