From 5cd81e6366330f0d712a3f3dc937edf78b663e97 Mon Sep 17 00:00:00 2001
From: Mateusz Barucha <mateusz@barucha.pl>
Date: Thu, 19 Feb 2015 18:36:17 +0100
Subject: [PATCH] Update phpab.php

New set_current_variation () function.

It's now possible to redirect users to specific experiment (e.g. from newsletter, or another page) using string queries, like www.example.com?experiment=control

if (isset($_GET['experiment'])) {
	$phpab->set_current_variation($_GET['experiment']);
}
---
 phpab.php | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/phpab.php b/phpab.php
index 4802bc1..2271451 100644
--- a/phpab.php
+++ b/phpab.php
@@ -150,6 +150,30 @@ public function set_tag ($t)
 		$this->tag = $t;
 	}
 	
+	public function set_current_variation ($new)
+	{
+		if($this->current_variation != '!unset' && $this->current_variation_key != -1)
+		{
+			return FALSE;
+		}
+		
+		array_unshift($this->variations, array('name' => 'control', 'value' => ''));
+		
+		$this->current_variation_key = 0;
+		foreach($this->variations as $n => $v)
+		{
+			if($v['name'] == $new)
+			{
+				$this->current_variation = $new;
+				return TRUE;
+			}
+			$this->current_variation_key++;
+		}
+		
+		unset($this->current_variation_key);
+		return FALSE;
+	}
+	
 	public function add_variation ($n, $v = '')
 	{
 		$n = trim(strtolower($n));