[PHP 8.1] Add CURLStringFile polyfill

Author: Ayesh

README.md

@@ -7,6 +7,7 @@ This component provides features added to PHP 8.1 core:
 - [`enum_exists`](https://php.net/enum-exists)
 - [`MYSQLI_REFRESH_REPLICA`](https://php.net/mysqli.constants#constantmysqli-refresh-replica) constant
 - [`ReturnTypeWillChange`](https://wiki.php.net/rfc/internal_method_return_types)
+- [`CURLStringFile`](https://php.net/CURLStringFile) (but only if PHP >= 7.4 is used)
 
 More information can be found in the
 [main Polyfill README](https://github.com/symfony/polyfill/blob/main/README.md).

Resources/stubs/CURLStringFile.php

@@ -0,0 +1,51 @@
+<?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.
+ */
+
+if (\PHP_VERSION_ID >= 70400 && extension_loaded('curl')) {
+    /**
+     * @property string $data
+     */
+    class CURLStringFile extends CURLFile
+    {
+        private $data;
+
+        public function __construct(string $data, string $postname, string $mime = 'application/octet-stream')
+        {
+            $this->data = $data;
+            parent::__construct('data://application/octet-stream;base64,'.base64_encode($data), $mime, $postname);
+        }
+
+        public function __set(string $name, $value): void
+        {
+            if ('data' !== $name) {
+                $this->$name = $value;
+
+                return;
+            }
+
+            if (is_object($value) ? !method_exists($value, '__toString') : !is_scalar($value)) {
+                throw new \TypeError('Cannot assign '.gettype($value).' to property CURLStringFile::$data of type string');
+            }
+
+            $this->name = 'data://application/octet-stream;base64,'.base64_encode($value);
+        }
+
+        public function __isset(string $name): bool
+        {
+            return isset($this->$name);
+        }
+
+        public function &__get(string $name)
+        {
+            return $this->$name;
+        }
+    }
+}