Referenced #2513

src/controllers/EntriesController.php

@@ -16,6 +16,7 @@
 use craft\events\ElementEvent;
 use craft\helpers\DateTimeHelper;
 use craft\helpers\Json;
+use craft\helpers\StringHelper;
 use craft\helpers\UrlHelper;
 use craft\models\EntryDraft;
 use craft\models\EntryVersion;
@@ -531,6 +532,13 @@ public function actionSaveEntry()
             $revisionsService->saveVersion($currentEntry);
         }
 
+        // Validate that the title does not have an emoji
+        if (StringHelper::hasMb4($entry->title)) {
+            Craft::$app->getSession()->setError(Craft::t('app', 'Couldn’t save entry with emoji in title.'));
+            return null;
+        }
+
+
         // Save the entry (finally!)
         if ($entry->enabled && $entry->enabledForSite) {
             $entry->setScenario(Element::SCENARIO_LIVE);

src/helpers/StringHelper.php

@@ -965,6 +965,17 @@ public static function encoding(string $string): string
         return static::toLowerCase(mb_detect_encoding($string, mb_detect_order(), true));
     }
 
+    /**
+     * Detects whether the given string has any 4-byte UTF-8 characters.
+     *
+     * @param string $string
+     * @return bool
+     */
+    public static function hasMb4(string $string): bool
+    {
+        return max(array_map('ord', str_split($string))) >= 240;
+    }
+
     /**
      * HTML-encodes any 4-byte UTF-8 characters.
      *