thinkphp 下载图片文件打开显示文件过大或损坏的解决方案

方案如下:

设置header头

public function download($path)
{   
       
    if(is_file($path) && file_exesites($path,$url)){
        $length = filesize($path);
        $type = mime_content_type($path);
        $showname =  ltrim(strrchr($path,'/'),'/');
        $pinjie = strstr($showname,'.');
        $downloadname = $path;
        // header头设置 图片下载
        header( 'Expires: 0' );
        header( 'Cache-Control: must-revalidate, post-check=0, pre-check=0' );
        header( 'Cache-Control: private', false );
        header( 'Content-Description:File Transfer' );
        header( 'Content-Type: image/jpeg');
        header('Content-Disposition: attachment; filename='.basename($downloadname));
        Header("Accept-Ranges: bytes");
         if (preg_match('/MSIE/', $_SERVER['HTTP_USER_AGENT'])) { //IE
             header('Content-Disposition: attachment; filename="' . rawurlencode('$url'.$downloadname) . '"');
         } else {
             header('Content-Disposition: attachment; filename="' . $downloadname . '"');
         }
         readfile($path);
         fclose($path);
         exit;
     }else{
         $this->error('您要下载的文件不存在或已丢失');
     }
}