Wordpress - That page can’t be found - php

Question

I have installed and configured on apache server wordpress (I didn't do that, I am not expert on websites). Now I uploaded my php application so root structure looks like this:
...
images
voucher (this is my application)
wp-admin
wp-content
wp-includes
When I input http://address.com/voucher/index.php into browser I got Wordpress error which contains information "Oops! That page can’t be found.". I don't know why is it trying to achieve my voucher catalog "by Wordpress system", maybe should I set some settings (.htacces or smth like this)?

Answer 1

Wordpress when installed uses rewrite to redirect all requests to index.php by default. If you have other dirs or files on the server you will have to consider them in your .htaccess rules.
Modify your .htaccess. Here is a sample rules that bypasses wordpress rules for your voucher directory.
#only allow the wordpress rules if it is not request /voucher.
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_URI} !^/voucher [NC]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
Or you can do your rules this way.
#if the request is for the voucher folder, do nothing and display the page
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/voucher [NC]
RewriteRule ^ - [L]
# BEGIN WordPress
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
# END WordPress
</IfModule>