あなたのフォーム:
<form action="http://192.168.10.253:82/montim/montime-bcp/montime/vendosja-porosise/listasearch.php" method="post">
<select name="kategoria">
<option value="klienti">Klienti</option>
<option value="id">ID</option>
</select>
<input type="submit" value="Submit" />
</form>
あなたの listasearch.php
<?php $kategoria = $_POST['kategoria']; echo $kategoria; ?>
get メソッドが必要な場合 (?categoria=categoria を使用):
<form action="http://192.168.10.253:82/montim/montime-bcp/montime/vendosja-porosise/listasearch.php" method="get">
<select name="kategoria">
<option value="klienti">Klienti</option>
<option value="id">ID</option>
</select>
<input type="submit" value="Submit" />
</form>
あなたの listasearch.php
<?php $kategoria = $_GET['kategoria']; echo $kategoria; ?>