问题
Using Wordpress as a CMS, the .htaccess file looks like this:
RewriteEngine On # 1. ok - enables engine
RewriteBase /blog/ # 2. ?? - sets blog directory as base for the rules
RewriteRule ^index\.php$ - [L] # 3. ?? - replaces index.php by nothing in the URL
RewriteCond %{REQUEST_FILENAME} !-f # 4. ?? - checks if request contains a file name
RewriteCond %{REQUEST_FILENAME} !-d # 5. ?? - checks if request contains a directory name
RewriteRule . /blog/index.php [L] # 6. ?? --> why this single dot (1 occurrence of a single character)?
I read extensive documentation (and still am reading) about mod_rewrite, I know what regex are and how they work, and I got my site working perfectly fine. Yet I'm copying-pasting and not sure to be understanding. Lines with ?? are the ones I am not sure to understand (and I don't get what line 6 does at all).
In another file based on https://stackoverflow.com/a/20979005 (this worked for my site):
RewriteCond %{HTTP_HOST} ^(www\.)?domain\.com$ # 7. ok
RewriteRule !^subfolder/ /subfolder%{REQUEST_URI} [L] # 8. ?? - if it does not contain the subfolder, add it (strange as I wanted exactly to remove it from the URL but it works)
My questions are:
- did I get lines 1 to 5 right?
- what exactly does line 6 do?
- is line 8 explanation correct?
回答1:
Here are answers:
Q1. did I get lines 1 to 5 right?
A1. yes you did
Q2. what exactly does line 6 do?
A2. It says for any request that is not empty (single DOT will match anything except the landing page) forward to /blog/index.php
Q3. is line 8 explanation correct?
A3. Yes it is correct. There is nothing strange. You want to remove /subfolder/ in your URLs for your clients but want to add subfolder/ internally/silently when your web server receives a request without subfolder/ so that you can load the page correctly.
来源：https://stackoverflow.com/questions/35303598/what-does-the-single-dot-do-in-this-htaccess-rewriterule