diff --git a/app/helpers.php b/app/helpers.php
index c877177a..e715f2ab 100644
--- a/app/helpers.php
+++ b/app/helpers.php
@@ -300,3 +300,20 @@ if (! function_exists('delete_sessions')) {
         Session::save();
     }
 }
+
+if (! function_exists('runtime_check')) {
+
+    function runtime_check(array $requirements)
+    {
+        // check php version
+        if (version_compare(PHP_VERSION, $requirements['php'], '<')) {
+            exit("[Error] Blessing Skin Server needs PHP version >= {$requirements['php']}, you are now using ".PHP_VERSION);
+        }
+
+        foreach ($requirements['extensions'] as $extension) {
+            if (!extension_loaded($extension)) {
+                exit("[Error] You have not installed the $extension extension");
+            }
+        }
+    }
+}
diff --git a/bootstrap/handler.php b/bootstrap/handler.php
index 751adb7a..086945f0 100644
--- a/bootstrap/handler.php
+++ b/bootstrap/handler.php
@@ -11,8 +11,6 @@
 |
 */
 
-require __DIR__.'/autoload.php';
-
 $app = require_once __DIR__.'/app.php';
 
 $kernel = $app->make(Illuminate\Contracts\Http\Kernel::class);
diff --git a/index.php b/index.php
index 5c7a1f2f..1de66879 100755
--- a/index.php
+++ b/index.php
@@ -7,18 +7,13 @@
  * @author   printempw <h@prinzeugen.net>
  */
 
-// runtime check
-if (version_compare(PHP_VERSION, '5.5.9', '<')) {
-    exit('[Error] Blessing Skin Server needs PHP version >= 5.5.9, you are now using '.PHP_VERSION);
-}
+require __DIR__.'/bootstrap/autoload.php';
 
-if (!class_exists('PDO')) {
-    exit('[Error] You have not installed the PDO extension');
-}
-
-if (!function_exists('openssl_encrypt')) {
-    exit('[Error] You have not installed the OpenSSL extension');
-}
+// check the runtime environment
+runtime_check([
+    'php' => '5.5.9',
+    'extensions' => ['pdo_mysql', 'openssl', 'gd']
+]);
 
 // handle the request
 require __DIR__.'/bootstrap/handler.php';