add trailing slash to slug url

Question

I have this rewrite condition I use it to grab the slug url and search for a blog post like this:

http://localhost:8080/blog/my-first-post

So I grab the slug and then look for the post and display it. Right now it accepts this two forms

http://localhost:8080/blog/my-first-post
http://localhost:8080/blog/my-first-post/

How should I change the .htaccess so it always adds or redirects with the slash at the end.

And how should I change it to remove the slash always?

Here is the .htaccess I have now which I have it in the blog directory:

<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-l
    RewriteRule ^(.*)$ index.php?url=$1 [QSA,L]
</IfModule>

Answer 1

You can replace your current htaccess code by this one

<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteBase /blog/

    # add trailing slash
    RewriteCond %{REQUEST_URI} !/$
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^(.*)$ $1/ [R=301,L]

    # remove trailing slash
    #RewriteCond %{REQUEST_FILENAME} !-d
    #RewriteRule ^(.+?)/$ $1 [R=301,L]

    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^(.*)$ index.php?url=$1 [QSA,L]
</IfModule>

Right now, it adds trailing slash. If you want to remove it, comment add trailing slash block lines and uncomment remove trailing slash block lines