THRIFT-4970: PHP tutorial doesn't work with Thrift v0.12.0+

Client: php

This closes #1890.
diff --git a/tutorial/php/PhpServer.php b/tutorial/php/PhpServer.php
index 5a9b49b..749da3a 100755
--- a/tutorial/php/PhpServer.php
+++ b/tutorial/php/PhpServer.php
@@ -5,7 +5,7 @@
 
 error_reporting(E_ALL);
 
-require_once __DIR__.'/../../lib/php/lib/ClassLoader/ThriftClassLoader.php';
+require_once __DIR__.'/../../vendor/autoload.php';
 
 use Thrift\ClassLoader\ThriftClassLoader;
 
@@ -13,8 +13,8 @@
 
 $loader = new ThriftClassLoader();
 $loader->registerNamespace('Thrift', __DIR__ . '/../../lib/php/lib');
-$loader->registerDefinition('shared', $GEN_DIR);
-$loader->registerDefinition('tutorial', $GEN_DIR);
+$loader->registerNamespace('shared', $GEN_DIR);
+$loader->registerNamespace('tutorial', $GEN_DIR);
 $loader->register();
 
 /*