如何让PHP+APAHCHE支持SSI？

不是，要让服务器支持shtml具体来说需要这几个步骤:

打开 apache的http.conf

Step 1: 找到

#AddType text/html .shtml
#AddHandler server-parsed .shtml

将前面的注释去掉

Step 2: 你需要给哪个虚拟机加上此功能，请在相应的虚拟机目录中加:

以下为引用的内容： <Directory "/data1/apache/share/htdocs"> # # This may also be "None", "All", or any combination of "Indexes", # "Includes", "FollowSymLinks", "ExecCGI", or "MultiViews". # # Note that "MultiViews" must be named *explicitly* --- "Options All" # doesn't give it to you. #     Options Includes FollowSymLinks MultiViews # ~~~~~~~~ <= INCLUDES 启动shtml脚本中用 # # This controls which options the .htaccess files in directories can # override. Can also be "All", or any combination of "Options", "FileInfo", # "AuthConfig", and "Limit" #     AllowOverride None # # Controls who can get stuff from this server. #     Order allow,deny     Allow from all </Directory>