alabala.com/see-this-post.php to alabala.com/see-this-post/

You can use this simple .htaccess redirect

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)\.php$ /$1/ [l,R=301,NC]

Материалът Redirect all php files to wordpress posts or strip .php extension е публикуван за пръв път на rosen4o.net.

Uppercase is different from lowercase and wordpress can’t match url

So solution is very simply

This fragment need to be pasted in functions.php

function unFocus_insensitivity() {
    if (preg_match('/[A-ZА-Я]/', $_SERVER['REQUEST_URI'])) {
        $_SERVER['REQUEST_URI'] = strtolower($_SERVER['REQUEST_URI']);
        $_SERVER['PATH_INFO']   = strtolower($_SERVER['PATH_INFO']);
    }
}
add_action('init', 'unFocus_insensitivity');

Code is working for Latin and Cyrillic letters

Материалът wordpress strange redirect е публикуван за пръв път на rosen4o.net.