框架升级及修复升级后的bug

backend/vendor/symfony/polyfill-php83/bootstrap72.php

@@ -0,0 +1,25 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+use Symfony\Polyfill\Php83 as p;
+
+if (!class_exists('ValueError', false)) {
+    class ValueError extends Error
+    {
+    }
+}
+
+if (extension_loaded('mbstring')) {
+    if (!function_exists('mb_str_pad')) {
+        /** @return string|false */
+        function mb_str_pad(?string $string, ?int $length, ?string $pad_string = ' ', ?int $pad_type = STR_PAD_RIGHT, ?string $encoding = null) { return p\Php83::mb_str_pad((string) $string, (int) $length, (string) $pad_string, (int) $pad_type, $encoding); }
+    }
+}