CodeIgniter /system/core/input.php
    
/**
 * Set cookie
 *
 * Accepts an arbitrary number of parameters (up to 7) or an associative
 * array in the first parameter containing all the values.
 *
 * @paramstring|mixed[]$nameCookie name or an array containing parameters
 * @paramstring$valueCookie value
 * @paramint$expireCookie expiration time in seconds
 * @paramstring$domainCookie domain (e.g.: '.yourdomain.com')
 * @paramstring$pathCookie path (default: '/')
 * @paramstring$prefixCookie name prefix
 * @parambool$secureWhether to only transfer cookies via SSL
 * @parambool$httponlyWhether to only makes the cookie accessible via HTTP (no javascript)
 * @returnvoid
*/
public function set_cookie($name, $value = '', $expire = '', $domain = '', $path = '/', $prefix = '', $secure = NULL, $httponly = NULL)
{
	if (is_array($name))
	{
		// always leave 'name' in last place, as the loop will break otherwise, due to $$item
		foreach (array('value', 'expire', 'domain', 'path', 'prefix', 'secure', 'httponly', 'name') as $item)
		{
			if (isset($name[$item]))
			{
			$$item = $name[$item];
			}
		}
	}

	if ($prefix === '' && config_item('cookie_prefix') !== '')
	{
		$prefix = config_item('cookie_prefix');
	}

	if ($domain == '' && config_item('cookie_domain') != '')
	{
		$domain = config_item('cookie_domain');
	}

	if ($path === '/' && config_item('cookie_path') !== '/')
	{
		$path = config_item('cookie_path');
	}

	$secure = ($secure === NULL && config_item('cookie_secure') !== NULL)
	? (bool) config_item('cookie_secure')
	: (bool) $secure;

	$httponly = ($httponly === NULL && config_item('cookie_httponly') !== NULL)
	? (bool) config_item('cookie_httponly')
	: (bool) $httponly;

	if ( ! is_numeric($expire))
	{
		$expire = time() - 86500;
	}
	else
	{
		$expire = ($expire > 0) ? time() + $expire : 0;
	}

	setcookie($prefix.$name, $value, $expire, $path, $domain, $secure, $httponly);
}