安装了几天还是没安装好，有谁知道原因吗？就是安装的时候第二步怎么都通过不去:Requirements checkYour server failed the requirements check. After you have fixed the below issues, refresh this page. Check the troubleshooting links at the bottom of this page if you need further assistance.PHP Your server's PHP satisfies all of Elgg's requirements.Web server We think your server is running the Apache web server.The rewrite test failed and the most likely cause is that AllowOverride is not set to All for Elgg's directory. This prevents Apache from processing the .htaccess file which contains the rewrite rules.A less likely cause is Apache is configured with an alias for your Elgg directory and you need to set the RewriteBase in your .htaccess. There are further instructions in the .htaccess file in your Elgg directory. Database The database requirements are checked when Elgg loads its database.红字部分是错误提示，但是AllowOverride 已经全部设置成ALL了，还是这个错误。
A less likely cause is Apache is configured with an alias for your Elgg directory and you need to set the RewriteBase in your .htaccess. There are further instructions in the .htaccess file in your Elgg directory.说你有可能是用的alias配置的， 需要在你的目录下面.htaccess配置RewriteBase
Your server's PHP satisfies all of Elgg's requirements.Web server
We think your server is running the Apache web server.The rewrite test failed and the most likely cause is that AllowOverride is not set to All for Elgg's directory. This prevents Apache from processing the .htaccess file which contains the rewrite rules.A less likely cause is Apache is configured with an alias for your Elgg directory and you need to set the RewriteBase in your .htaccess. There are further instructions in the .htaccess file in your Elgg directory.
Database
The database requirements are checked when Elgg loads its database.红字部分是错误提示，但是AllowOverride 已经全部设置成ALL了，还是这个错误。