PHP Form passing input values to url - php

Question

I have a form that the user has to input number contract and a code like so:
<form action="index.php?option=com_platiniumchristmas&cartao=<?php echo $_GET['cartao']?>&contrato=contract&codigo=code" method="post">
<div class="form-group">
<div class="input-group">
<span class="input-group-addon">
<i class="fa fa-user tip" title="Utilizador"></i>
</span>
<input autocomplete="off" type="text" name="contract" id="contract" class="input form-control" tabindex="0" size="18" placeholder="Num. Contrato" required="" value="">
</div>
</div>
<div class="form-group">
<div class="input-group">
<span class="input-group-addon">
<i class="fa fa-lock tip" title="Senha"></i>
</span>
<input autocomplete="off" type="password" name="codigo" id="code" class="input form-control" tabindex="0" size="18" placeholder="Codigo" required="" value="">
</div>
</div>
<input type="hidden" name="cartao" id="cartao" value="<?php echo $_POST['cartao']?>"/>
<input type="submit"value="Login" id="submit" class="btn btn-info pull-right" />
</form>
I have to post those values into an url so that the other page recives this values. But what is happing is instead of putting the id on my form action url it does nothing. Can any one help me with this issue.
The Hidden field is to call a function inside of a the form like so:
<?php
function validateUser($contrato, $codigo)
{
$url = 'http://managerexternal.medicare.pt/MedicareManager_External.svc?wsdl';
$client = new SoapClient($url);
$paramsMC = array('schema'=>'mctestes','numcContrato'=>$contrato, 'codigo'=>$codigo);
$paramsGC = array('schema'=>'gctestes','numcContrato'=>$contrato, 'codigo'=>$codigo);
if($client->AuthenticatedUserByContratoCodigo($paramsMC) == true){
$controller = new getInfoContact();// Instanciar Class
$controller->getuserInfo('mctestes',$contrato);
$_GET['schema']="mctestes";
$controllerNumeroCartao = new getInfoContact();// Instanciar Class
$_POST['cartao']=$controllerNumeroCartao->getNumCartao('mctestes',$contrato);
}
?>
I need to a function to get value for "cartao". Then I need to send through an url the contact and code value that where set by the user. With does two values I call a function to get the users "cartao".

Answer 1

First of all your code is wrong
<form action="index.php?option=com_platiniumchristmas&cartao=<?php echo $_GET['cartao']?>&contrato=contract&codigo=codigo method="get">
should be
<form action="index.php?option=com_platiniumchristmas&cartao=<?php echo $_GET['cartao'];?>&contrato=contract&codigo=codigo" method="get">