Merging the Limesurvey 1.91+ branch of queXS in to the trunk

include/limesurvey/classes/dTexts/dFunctions/dFunctionSwitch.php

@@ -0,0 +1,32 @@
+<?php
+
+class dFunctionSwitch implements dFunctionInterface
+{
+	public function __construct()
+	{
+	}
+	
+	public function run($args)
+	{		
+		global $connect, $dbprefix;			
+		$field = $args[0];
+		$srid = $_SESSION['srid'];
+		$sid = $_POST['sid'];
+		$query = "SELECT $field FROM {$dbprefix}survey_$sid WHERE id = $srid";
+		if(!$result = $connect->Execute($query)){
+			throw new Exception("Couldn't get question '$field' answer<br />".$connect->ErrorMsg()); //Checked	
+		}
+		$row = $result->fetchRow();		
+		$value = $row[$field];
+		
+		$found = array_keys($args, $value);
+		if(count($found))
+		{
+			while($e = each($found))
+				if($e['value'] % 2 != 0)	// we check this, as only at odd indexes there are 'cases'
+					return $args[$e['value']+1]; // returns value associated with found 'case'
+		}
+		// return empty string if none of cases matches user's answer 
+		return "";		
+	}
+}