Convert path to lower case before matching for blog

[codix]

Lets take example of blog a blog example.com/mynewblog . Some users may type it example.com/MyNewBlog, others example.com/mynewblog and any variations inbetween.

There is no intensive for having mixed case blognames, it only leads to confusion among users.

Make blog path lowercase before trying to match a blog.

Patch made against trunk.

[jeremyfelt]

We use strtolower() when creating new sites and users. We also use it in get_blog_id_from_url().

It seems not using strtolower() when looking for the site *could* cause an issue if the database collation was set in a way that made the query for path case sensitive. Adding that to ms-settings.php would likely not hurt.

I don't understand the removal of the case insensitive flag in parse_request(), that seems like an unnecessary change that could go against the goal of being case insensitive.

Moving to 3.9 as it's worth discussing strtolower( $path ) as part of our site matching.

[codix]

Yes, it was an old patch we had in our system. We can drop the removal of the case insensitive flag. I'm sorry for the inconvenience.

[markjaquith]

move the strtolower() before the last preg_replace()

[jeremyfelt]

26403.2.diff​ looks good to me.

Related: #17168

[jeremyfelt]

26403.3.diff is a refresh against current trunk as most previous stuff is gone.

This ensures the path is all lower case, similar to how domain is already handled.

[SergeyBiryukov]

Previously: #16200

[jeremyfelt]

26403.3.diff still applies cleanly to trunk.

[nacin]

In 27724:

Multisite: Lowercase REQUEST_URI when matching paths.

props markjaquith, jeremyfelt.
fixes #26403.