php自动保存远程文件

stream_context_set_default( [
    'ssl' => [
        'verify_peer' => false,
        'verify_peer_name' => false,
    ],
]);
        $iconapi = "https://g.csdnimg.cn/static/logo/favicon32.ico"; //获取站点图标接口api
        $fileCon = file_get_contents($iconapi);
        $localPath = "/7.png";
        file_put_contents($localPath,$fileCon);
      // echo filesize($localPath);     输出文件流    
        die($fileCon);    

注意事项：当前文件的目录 权限一定要设置777
不然会报 如下错误
failed to open stream: Permission denied in ...