Use mbstring proxy methods (#12104)

* Use mbstring proxy methods

* Avoid using strtolower/strtoupper if mbstring is not available to prevent possible unicode problems

core/Common.php

@@ -232,7 +232,27 @@ class Common
             return mb_strtolower($string, 'UTF-8');
         }
 
-        return strtolower($string);
+        // return unchanged string as using `strtolower` might cause unicode problems
+        return $string;
+    }
+
+    /**
+     * Multi-byte strtoupper() - works with UTF-8.
+     *
+     * Calls `mb_strtoupper` if available and falls back to `strtoupper` if not.
+     *
+     * @param string $string
+     * @return string
+     * @api
+     */
+    public static function mb_strtoupper($string)
+    {
+        if (function_exists('mb_strtoupper')) {
+            return mb_strtoupper($string, 'UTF-8');
+        }
+
+        // return unchanged string as using `strtoupper` might cause unicode problems
+        return $string;
     }
 
     /*

plugins/API/ProcessedReport.php

@@ -363,13 +363,14 @@ class ProcessedReport
 
         list($newReport, $columns, $rowsMetadata, $totals) = $this->handleTableReport($idSite, $dataTable, $reportMetadata, $showRawMetrics, $formatMetrics);
 
-	if (function_exists('mb_substr')) {
+        if (function_exists('mb_substr')) {
             foreach ($columns as &$name) {
                 if (substr($name, 0, 1) === mb_substr($name, 0, 1)) {
-		    $name = ucfirst($name);
-		}
+                    $name = ucfirst($name);
+                }
             }
-	}
+        }
+
         $website = new Site($idSite);
 
         $period = Period\Factory::build($period, $date);

plugins/Intl/Commands/GenerateIntl.php

@@ -9,6 +9,7 @@
 
 namespace Piwik\Plugins\Intl\Commands;
 
+use Piwik\Common;
 use Piwik\Container\StaticContainer;
 use Piwik\Development;
 use Piwik\Filesystem;
@@ -51,7 +52,7 @@ class GenerateIntl extends ConsoleCommand
         }
 
         preg_match_all("~^(.)(.*)$~u", $str, $arr);
-        return mb_strtoupper($arr[1][0], 'UTF-8').$arr[2][0];
+        return Common::mb_strtoupper($arr[1][0]).$arr[2][0];
     }
 
     protected function execute(InputInterface $input, OutputInterface $output)

plugins/MobileMessaging/SMSProvider.php

@@ -8,6 +8,7 @@
  */
 namespace Piwik\Plugins\MobileMessaging;
 
+use Piwik\Common;
 use Piwik\Container\StaticContainer;
 use Piwik\Plugin;
 use Piwik\Piwik;
@@ -213,7 +214,7 @@ abstract class SMSProvider
 
     private static function sizeOfSMSContent($smsContent, $containsUCS2Chars)
     {
-        if ($containsUCS2Chars) return mb_strlen($smsContent, 'UTF-8');
+        if ($containsUCS2Chars) return Common::mb_strlen($smsContent);
 
         $sizeOfSMSContent = 0;
         foreach (self::mb_str_split($smsContent) as $char) {

plugins/ScheduledReports/Controller.php

@@ -8,6 +8,7 @@
  */
 namespace Piwik\Plugins\ScheduledReports;
 
+use Piwik\Common;
 use Piwik\Date;
 use Piwik\Piwik;
 use Piwik\Plugins\LanguagesManager\LanguagesManager;
@@ -36,7 +37,7 @@ class Controller extends \Piwik\Plugin\Controller
         $reportTypes = API::getReportTypes();
         $reportTypeOptions = array();
         foreach ($reportTypes as $reportType => $icon) {
-            $reportTypeOptions[$reportType] = mb_strtoupper($reportType);
+            $reportTypeOptions[$reportType] = Common::mb_strtoupper($reportType);
         }
         $view->reportTypes = $reportTypes;
         $view->reportTypeOptions = $reportTypeOptions;
@@ -53,7 +54,7 @@ class Controller extends \Piwik\Plugin\Controller
             $reportFormatsByReportType[$reportType] = API::getReportFormats($reportType);
             $reportFormatsByReportTypeOptions[$reportType] = $reportFormatsByReportType[$reportType];
             foreach ($reportFormatsByReportTypeOptions[$reportType] as $type => $icon) {
-                $reportFormatsByReportTypeOptions[$reportType][$type] = mb_strtoupper($type);
+                $reportFormatsByReportTypeOptions[$reportType][$type] = Common::mb_strtoupper($type);
             }
             $allowMultipleReportsByReportType[$reportType] = API::allowMultipleReports($reportType);