chcon -R -t httpd_user_content_t public_html/
所用命令解析：
ls -Z -d public_html/
＃显示文件／目录的安全语境－Z, --context
Display security context so it fits on most displays. Displays only mode, user, group, security context and file name.-d, --directory
list directory entries instead of contents, and do not dereference symbolic links
chcon -R -t httpd_user_content_t public_html/
＃修改文件／目录的安全语境-R, --recursive
change files and directories recursively-t, --type
set type TYPE in the target security context 但是我不知道是神马额
