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msd2/tracking/piwik/plugins/Diagnostics/Diagnostic/PhpFunctionsCheck.php

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+<?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 enabled PHP functions.
+ */
+class PhpFunctionsCheck implements Diagnostic
+{
+    /**
+     * @var Translator
+     */
+    private $translator;
+
+    public function __construct(Translator $translator)
+    {
+        $this->translator = $translator;
+    }
+
+    public function execute()
+    {
+        $label = $this->translator->translate('Installation_SystemCheckFunctions');
+
+        $result = new DiagnosticResult($label);
+
+        foreach ($this->getRequiredFunctions() as $function) {
+            if (! self::functionExists($function)) {
+                $status = DiagnosticResult::STATUS_ERROR;
+                $comment = sprintf(
+                    '%s <br/><br/><em>%s</em><br/><em>%s</em><br/>',
+                    $function,
+                    $this->getHelpMessage($function),
+                    $this->translator->translate('Installation_RestartWebServer')
+                );
+            } else {
+                $status = DiagnosticResult::STATUS_OK;
+                $comment = $function;
+            }
+
+            $result->addItem(new DiagnosticResultItem($status, $comment));
+        }
+
+        return array($result);
+    }
+
+    /**
+     * @return string[]
+     */
+    private function getRequiredFunctions()
+    {
+        return array(
+            'debug_backtrace',
+            'create_function',
+            'eval',
+            'hash',
+            'gzcompress',
+            'gzuncompress',
+            'pack',
+        );
+    }
+
+    /**
+     * Tests if a function exists. Also handles the case where a function is disabled via Suhosin.
+     *
+     * @param string $function
+     * @return bool
+     */
+    public static function functionExists($function)
+    {
+        // eval() is a language construct
+        if ($function == 'eval') {
+            // does not check suhosin.executor.eval.whitelist (or blacklist)
+            if (extension_loaded('suhosin')) {
+                return @ini_get("suhosin.executor.disable_eval") != "1";
+            }
+            return true;
+        }
+
+        $exists = function_exists($function);
+
+        if (extension_loaded('suhosin')) {
+            $blacklist = @ini_get("suhosin.executor.func.blacklist");
+            if (!empty($blacklist)) {
+                $blacklistFunctions = array_map('strtolower', array_map('trim', explode(',', $blacklist)));
+                return $exists && !in_array($function, $blacklistFunctions);
+            }
+        }
+
+        return $exists;
+    }
+
+    private function getHelpMessage($missingFunction)
+    {
+        $messages = array(
+            'debug_backtrace' => 'Installation_SystemCheckDebugBacktraceHelp',
+            'create_function' => 'Installation_SystemCheckCreateFunctionHelp',
+            'eval'            => 'Installation_SystemCheckEvalHelp',
+            'hash'            => 'Installation_SystemCheckHashHelp',
+            'gzcompress'      => 'Installation_SystemCheckGzcompressHelp',
+            'gzuncompress'    => 'Installation_SystemCheckGzuncompressHelp',
+            'pack'            => 'Installation_SystemCheckPackHelp',
+        );
+
+        return $this->translator->translate($messages[$missingFunction]);
+    }
+}