Here is the code
<?php $dr = $_GET['dr']; if(empty($dr)){ echo "dr is empty...";} elseif($dr == 'kola'){(include 'k.php');} elseif($dr == 'vova'){ echo "vova2";} ?>
How to assign more values to elseif($dr == 'kola')
? for example kola2 kola3 kolyan kolka
etc.?