Here is a class that will submit post variables or cookie variables using the CURL library.

The CookiePost Class

/**
 * CookiePost
 * Uses CURL to submit a post and/or cookie.
 *
 * @author Kyle Robinson Young <kyle at kyletyoung.com>
 */
class CookiePost
{
	var $useragent		= 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)';
	var $referer		= 'http://www.google.com';
	var $timeout		= 30;
	var $maxredirs		= 4;
	var $status;
	var $post, $cookie	= array();

	/**
	 * SUBMIT
	 *
	 * @param str $url
	 * @return bool | str
	 */
	function submit($url=null)
	{
		if (empty($url)) return false;

		$curl = curl_init();
		curl_setopt($curl, CURLOPT_URL, $url);
		curl_setopt($curl, CURLOPT_HTTPHEADER, array('Expect:'));
		curl_setopt($curl, CURLOPT_TIMEOUT, $this->timeout);
		curl_setopt($curl, CURLOPT_MAXREDIRS, $this->maxredirs);
		curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
		curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);

		// IF COOKIES
		if ($this->getVars('cookie', '; '))
		{
			curl_setopt($curl, CURLOPT_COOKIE, $this->getVars('cookie'));
		} // cookie

		// IF POST
		if ($this->getVars('post'))
		{
			curl_setopt($curl, CURLOPT_POST, true);
			curl_setopt($curl, CURLOPT_POSTFIELDS, $this->getVars('post'));
		} // post

		curl_setopt($curl, CURLOPT_USERAGENT, $this->useragent);
		curl_setopt($curl, CURLOPT_REFERER, $this->referer);

		$html = curl_exec($curl);
		$this->status = curl_getinfo($curl, CURLINFO_HTTP_CODE);
		curl_close($curl);

		return $html;
	} // submit

	/**
	 * GET VARS
	 * Returns class vars from array to str
	 *
	 * @param str $name
	 * @return false | str
	 */
	function getVars($name=null, $ender='&')
	{
		if (empty($this->$name)) return false;
		if (!is_array($this->$name)) return $this->$name;
		$vars = '';
		foreach ($this->$name as $key => $val)
		{
			if (empty($key)) continue;
			$vars .= $key.'='.$val.$ender;
		} // foreach
		$this->$name = substr($vars, 0, -1);
		return $this->$name;
	} // getVars

} // CookiePost

Using The Code

$cookiePost = new CookiePost();
$cookiePost->cookie = array(
	'user'		=> 'kyle',
	'passwd'	=> '1234',
	'cookie'	=> '1'
);
$cookiePost->post = array(
	'postVar1'	=> 'testing'
);
echo $cookiePost->submit('http://www.example.com/test.php');

First create a CookiePost object and then specify any cookies and/or post vars we want to submit using an associative array. Finally just give the submit method a URL to submit to. It will return the HTML and set the status variable to the returned HTTP status code. Enjoy.