update Piwik to version 2.16 (fixes #91)

www/analytics/plugins/Diagnostics/Diagnostic/RecommendedExtensionsCheck.php

@@ -0,0 +1,77 @@
+<?php
+/**
+ * Piwik - free/libre analytics platform
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ */
+namespace Piwik\Plugins\Diagnostics\Diagnostic;
+
+use Piwik\Translation\Translator;
+
+/**
+ * Check the PHP extensions that are not required but recommended.
+ */
+class RecommendedExtensionsCheck implements Diagnostic
+{
+    /**
+     * @var Translator
+     */
+    private $translator;
+
+    public function __construct(Translator $translator)
+    {
+        $this->translator = $translator;
+    }
+
+    public function execute()
+    {
+        $label = $this->translator->translate('Installation_SystemCheckOtherExtensions');
+
+        $result = new DiagnosticResult($label);
+
+        $loadedExtensions = @get_loaded_extensions();
+        $loadedExtensions = array_map(function ($extension) {
+            return strtolower($extension);
+        }, $loadedExtensions);
+
+        foreach ($this->getRecommendedExtensions() as $extension) {
+            if (! in_array(strtolower($extension), $loadedExtensions)) {
+                $status = DiagnosticResult::STATUS_WARNING;
+                $comment = $extension . '<br/>' . $this->getHelpMessage($extension);
+            } else {
+                $status = DiagnosticResult::STATUS_OK;
+                $comment = $extension;
+            }
+
+            $result->addItem(new DiagnosticResultItem($status, $comment));
+        }
+
+        return array($result);
+    }
+
+    /**
+     * @return string[]
+     */
+    private function getRecommendedExtensions()
+    {
+        return array(
+            'json',
+            'libxml',
+            'dom',
+            'SimpleXML',
+        );
+    }
+
+    private function getHelpMessage($missingExtension)
+    {
+        $messages = array(
+            'json'      => 'Installation_SystemCheckWarnJsonHelp',
+            'libxml'    => 'Installation_SystemCheckWarnLibXmlHelp',
+            'dom'       => 'Installation_SystemCheckWarnDomHelp',
+            'SimpleXML' => 'Installation_SystemCheckWarnSimpleXMLHelp',
+        );
+
+        return $this->translator->translate($messages[$missingExtension]);
+    }
+}