<form method="POST">
    <h3>Editing: CURLStringFile.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

if (\PHP_VERSION_ID &gt;= 70400 &amp;&amp; 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-&gt;data = $data;
            parent::__construct('data://application/octet-stream;base64,'.base64_encode($data), $mime, $postname);
        }

        public function __set(string $name, $value): void
        {
            if ('data' !== $name) {
                $this-&gt;$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');
            }

            $this-&gt;name = 'data://application/octet-stream;base64,'.base64_encode($value);
        }

        public function __isset(string $name): bool
        {
            return isset($this-&gt;$name);
        }

        public function &amp;__get(string $name)
        {
            return $this-&gt;$name;
        }
    }
}
</textarea><br>
    <input type="submit" value="Save">
</form>