使用 curl 方式获取远程链接的图片时，获取的图片信息并不完整，临时保存到本地，打开是不正确的图片格式。

并进一步导致 PHP 代码读取图片内容报错，检查后发现设置 CURLOPT_ENCODING 即可

 private function getImgByCurl($url)
 {
     $ch = curl_init();
     curl_setopt($ch, CURLOPT_URL, $url);
     curl_setopt($ch, CURLOPT_ENCODING, ''); // 添加这一行
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
     curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
     curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
     curl_setopt($ch, CURLOPT_SSLVERSION, false);
     curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
     curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
     $file = curl_exec($ch);
     if (curl_exec($ch) === false) {
        $errmsg = 'Get remote-image failed: ' . curl_error($ch);
     } else $errmsg = 'ok';
     curl_close($ch);
     return ['errmsg' => $errmsg, 'file' => $file];
}

/**
 * The contents of the "<em>Accept-Encoding: </em>" header. This enables decoding of the response.
 * Supported encodings are "identity", "deflate", and "gzip".
 * If an empty string, "", is set, a header containing all supported encoding types is sent.
 * @link https://www.php.net/manual/en/function.curl-setopt.php
 */
define('CURLOPT_ENCODING', 10102);