Nginx & PHP in a subdirectory

I have an app behind nginx. But i need a specific path in this app redirect to a Wordpress Blog

Example :

example.com/ -------> Redirect to my app

example.com/whatever/ -------> Redirect to my app too

example.com/blog/ ------->Redirect to my Wordpress Blog

So, I add a location matching this sub-path

server {
        listen 80 default_server;

        index index.php;

        server_name _;

        location ^~ /blog {
                root /path/to/my/blog;
                index index.php index.html;

                location ^~ /blog/(.*\.php)$ {
                   fastcgi_pass   127.0.0.1:9000;
                   fastcgi_index index.php;
                   fastcgi_param  SCRIPT_FILENAME  /path/to/my/blog/$fastcgi_script_name;
                   include fastcgi_params;
                }
        }

        location ~* /(.*) {
                #here the conf for the rest of the website
        }
}

And when i try to get the page, i have a 404 with this eror in the logs :

2016/05/22 15:27:24 [error] 21759#0: *1 open() "/path/to/my/blog/blog/index.php" failed (2: No such file or directory), client: XX.XX.XX.XX, server: _, request: "GET /blog/index.php HTTP/1.1", host: "example.com"

With /blog is duplicate.

How i can fix this ?

EDIT :

Now i have this (Thanks to Richard Smith) :

location ^~ /blog {
                root /path/to/my/;
                index index.php;
                try_files $uri $uri/ /blog/index.php;

                location ~ \.php$ {
                        try_files $uri =404;
                        include fastcgi_params;
                        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
                        fastcgi_pass   127.0.0.1:9000;
                }
        }

But now, i got index.php event if i try to ge another file (toto.html for example)

If i replace

            try_files $uri $uri/ /blog/index.php;

with

            try_files $uri $uri/;

I got a 404 with

2016/05/22 20:57:21 [error] 22621#0: *1 "/path/to/my/blog/toto.html/index.php" is not found (20: Not a directory), client: 84.98.248.33, server: _, request: "GET /blog/toto.html/ HTTP/1.1", host: "example.com"

in the logs

EDIT 2 :

The file exist and currently, and i give it 777 rights (i will remove them later before go to production):

drwxrwxrwx  2 user group 4096 May 22 20:36 .
drwxr-xr-x 11 user group   4096 May 23 06:20 ..
-rwxrwxrwx  1 user group  126 May 22 13:30 index.php
-rwxrwxrwx  1 user group  102 May 22 10:25 old.index.html
-rwxrwxrwx  1 user group   12 May 22 12:24 toto.html

Thank you fo your patience !

As /blog is the first component of the URI, you need to remove it from the root. Use root /path/to/my when inside location ^~ /blog.

See this document for details.

Also, your .php location is invalid syntax. You can use something like this:

location ^~ /blog {
    root /path/to/my;
    index index.php;
    try_files $uri $uri/ /blog/index.php;

    location ~ \.php$ {
        try_files $uri =404;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_pass   127.0.0.1:9000;
    }
}

See this document for details.

Finally, the rest of the website can use normal locations, such as location / as the ^~ modifier on your location ^~ /blog gives it precedence for any URI beginning with /blog. See my second reference for details.

Nginx & PHP in a subdirectory

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