我正在尝试使用以下命令安装作曲家：
sudo curl -s https://getcomposer.org/installer | php
我收到此错误：
All settings correct for using Composer
Downloading...
Download failed: failed to open stream: Permission denied
Downloading...
Download failed: failed to open stream: Permission denied
Downloading...
Download failed: failed to open stream: Permission denied
The download failed repeatedly, aborting.
我不知道为什么？你有想法吗？我试着用谷歌搜索，但什么也没有。