<?php
$data = "yes";
switch ($data) {
case "no":
case "false":
case "0":
case false:
case 0:
$r = "No";
break;
case "":
$r = "";
break;
case "yes":
case "true":
case "1":
case 1:
case true:
$r = "Yes";
break;
default:
$r = "Yes";
break;
}
var_dump($r);