Odeslat POST data pres CURL

$post = array('filtry' =>'katalogy/', 'zeme' => '%E8esk%FD', 'typ' => '1', 'on' => 'OK');
  
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, "https://www.example.com/katalogy/");
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 3);
  curl_setopt($ch, CURLOPT_TIMEOUT, 8);
  curl_setopt($ch, CURLOPT_POST, 1);
  curl_setopt($ch, CURLOPT_POSTFIELDS, $post);  
  $xml_curl = curl_exec($ch);
  curl_close($ch);
  
echo $xml_curl;

<form name='filtry' id='filtry' action='katalogy/' method='POST' class='in-form'>
Jazyk: <select name='zeme' size='1' onChange='document.filtry.submit();' class='posun'>
<option value=''>- všechny -</option>
<option selected>anglický</option>
<option>český</option>
<option>slovenský</option>
</select>
Typ: <select name='typ' size='1' onChange='document.filtry.submit();' class='posun'>
<option value='0'>- všechny -</option>
<option value='1' selected>zdarma</option>
<option value='2'>zpětný odkaz</option>
<option value='3'>placený</option>
</select>
<noscript><input type='submit' name='ok' value='OK'></noscript>
</form>