<form action="" method="post">
<li>логин:<input name="username" type="text" class="input" size="15" style="margin-left:20px;"/></li>
<li>пароль:<input name="password" type="password" class="input" size="15"/></li>
<li>сервер:<select style="margin-left:12px;" class="input" name="servers"><option></option>
<option value="1">сервер 1</option>
<option value="2">сервер 2</option></select></li>
<li><input type="submit" value="Войти" class="button" style="margin-left:147px"></li></form>

<?php
$server = htmlspecialchars(trim($_POST['servers']));  // Запишем в переменную значение
if(!$server) { die('Please Select a server!'); }  // Если не выбрал

switch($server) { // Просматриваем варианты логина

case 1:
  // Логин на сервер 1
break;

case 2:
  // Логин на сервер 2
break;

default:
  // Действия, если Хацкер)
break;
}
?>

<?php

if (isset($_POST['servers']))
{
  switch($_POST['servers'])
  {
    case 1 :
      'http://74.86.115.4:2222/CMD_LOGIN';
    break;

    case 2 :
      './billing/billing.php';
    break;

    // .......

    default :
      // действия, если не подходит ни один вариант
    break;
  }
}

?>

<form action="/connect.php" method="post">
<li>логин:<input name="username" type="text" class="input" size="15" style="margin-left:20px;"/></li>
<li>пароль:<input name="password" type="password" class="input" size="15"/></li>
<li>сервер:<select style="margin-left:12px;" class="input" name="servers"><option></option>
<option value="1">сервер 1</option>
<option value="2">сервер 2</option></select></li>
<li><input type="submit" value="Войти" class="button" style="margin-left:147px"></li></form>

 case 'server1' :
    здесь url для перехода;
      
    break;

    case 'server2' :
      здесь url для перехода;
    break;

<?php

if (isset($_POST['servers']))
{
  switch($_POST['servers'])
  {
    case 'server1' :
      $ch = curl_init();
	   curl_setopt($ch, CURLOPT_URL, 'http://74.86.115.4:2222/');
	   curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
	   curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
	   curl_setopt($ch, CURLOPT_POST, 1);
	   curl_setopt($ch, CURLOPT_POSTFIELDS, "var1=username&var2=password");
	   $result = curl_exec($ch);
	curl_close($ch);  
	echo $result;
    break;

    case 'server2' :
      
    break;
    default :
     
    break;
  }
}

?>

<?php

if (isset($_POST['servers']))
{
  switch($_POST['servers'])
  {
    case server1 :
      $ch = curl_init();
	   curl_setopt($ch, CURLOPT_URL, 'http://74.86.115.4:2222/CMD_LOGIN');
	   curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
	   curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
	   curl_setopt($ch, CURLOPT_POST, 1);
	   curl_setopt($ch, CURLOPT_POSTFIELDS, "username=username&password=password");
	   $result = curl_exec($ch);
	curl_close($ch);  
	echo $result;
    break;

    case 'server2' :
      
    break;
    default :
     
    break;
  }
}

?>

curl_setopt($ch, CURLOPT_POSTFIELDS, 'username=' . $_POST['username'] . '&password=' .$_POST['password']);

	  function curl_redir_exec($ch)  
{  
    static $curl_loops = 0;  
    static $curl_max_loops = 20;  
    if ($curl_loops   >= $curl_max_loops)  
    {  
    $curl_loops = 0;  
        return FALSE;  
    }  
    curl_setopt($ch, CURLOPT_HEADER, true);  
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);  
    $data = curl_exec($ch);  
    list($header, $data) = explode("\n\n", $data, 2);  
    $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);  
    if ($http_code == 301 || $http_code == 302)  
    {  
    $matches = array();  
        preg_match('/Location:(.*?)\n/', $header, $matches);  
    $url = @parse_url(trim(array_pop($matches)));  
        if (!$url)  
    {  
        //couldn't process the url to redirect to  
        $curl_loops = 0;  
        return $data;  
        }  
    $last_url = parse_url(curl_getinfo($ch, CURLINFO_EFFECTIVE_URL));  
    if (!$url['scheme'])  
        $url['scheme'] = $last_url['scheme'];  
    if (!$url['host'])  
        $url['host'] = $last_url['host'];  
    if (!$url['path'])  
        $url['path'] = $last_url['path'];  
    $new_url = $url['scheme'] . '://' . $url['host'] . $url['path'] . ($url['query']?'?'.$url['query']:'');  
    curl_setopt($ch, CURLOPT_URL, $new_url);  
    //debug('Redirecting to', $new_url);  
    return curl_redir_exec($ch);  
    }   else {  
        $curl_loops=0;  
        return $data;  
        }  
}  

$cookie='';
	$curl = curl_init(); 
	curl_setopt($curl, CURLOPT_URL, 'http://74.86.115.4:2222/CMD_LOGIN'); 
	curl_setopt($curl, CURLOPT_HEADER, 1); 
	curl_setopt($ch, CURLOPT_COOKIE,$cookie);
	curl_setopt($curl, CURLOPT_POST, 1); 
	curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); 
	curl_setopt($curl, CURLOPT_POSTFIELDS, 
	array (
		'username'=>$_POST['username'],
		'password'=>$_POST['password'],
		'submit'=>'get' 
	));
	curl_setopt($curl, CURLOPT_USERAGENT, 'MSIE 5'); 
	curl_setopt ($curl, CURLOPT_REFERER, "http://zarur.ru"); 
	$result = curl_exec($curl);
	curl_close($curl);
	
	 echo htmlspecialchars($result);

curl_setopt($curl, CURLOPT_HEADER, 1);

 $matches = array();  
        preg_match('/Location:(.*?)\n/', $header, $matches);  
    $url = @parse_url(trim(array_pop($matches))); 

$matches = array(); 
       preg_match('/Location:(.*?)\n/', $header, $matches);  
    $url = @parse_url(trim(array_pop($matches)));
   preg_match_all('|Set-Cookie: (.*);|U', $content, $results);   
    $cookies = implode(';', $results[1]);