modified testing php template

tests/view/PHPViewTest.php

@@ -31,7 +31,7 @@ class PHPViewTest extends PHPUnit_Framework_TestCase
         vfsStreamWrapper::setRoot($root);
         $views_dir = vfsStream::newDirectory('views');
         $this->template = new vfsStreamFile('test.phtml');
-        $this->template->setContent('<?= $a ." " . $b . " " . $c; ?>');
+        $this->template->setContent('<?php echo $a ." " . $b . " " . $c; ?>');
         $views_dir->addChild($this->template);
         $root->addChild($views_dir);