Apache mod rewrite like twitter url - php

Question

Here is my .htaccess code
ErrorDocument 404 /404.php
Options -Multiviews
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([^/]+)/?$ profile?username=$1 [NC,L]
RewriteCond %{REQUEST_FILENAME}!-f
RewriteCond %{REQUEST_FILENAME}!-d
RewriteRule ^([a-z]+)/([a-z\-]+)$ /$1/$2.php
RewriteRule ^s/([^/]*)$ /s.php?share=$1 [L]
RewriteCond %{HTTP_HOST} !^$
RewriteCond %{HTTP_HOST} ^mywebsite.com [NC]
RewriteCond %{HTTPS}s ^on(s)|
RewriteRule ^ http%1://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
I would users on my website to be able to access their profile like how twitter does. For instance www.mywebsite.com/Jim would actually be rewritten as www.mywebsite.com/profile?username=Jim.
Currently the only part of the code that works is allowing url without the php extension. For instance www.mywebsite.com/home instead of www.mywebsite.com/home.php.
Moreover, the rewrite rule for s.php does not work like it should. I would like the page www.mywebsite.com/s/123456 to be written as www.mywebsite.com/s?share=12345.
I don't if the order of my htaccess is wrong but none of these seem to work. Additionally when a page is not found I'm still getting the default Apache 404 even though I have a rewrite rule to 404.php

Answer 1

Your redirect needs to be first, then your profile, then your share, then the most generalized php extension:
ErrorDocument 404 /404.php
Options -Multiviews
RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} !^$
RewriteCond %{HTTP_HOST} ^mywebsite.com [NC]
RewriteCond %{HTTPS}s ^on(s)|
RewriteRule ^ http%1://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([^/]+)/?$ profile.php?username=$1 [NC,L]
RewriteCond %{REQUEST_FILENAME}!-f
RewriteCond %{REQUEST_FILENAME}!-d
RewriteRule ^s/([^/]*)$ /s.php?share=$1 [L]
RewriteCond %{REQUEST_FILENAME}!-f
RewriteCond %{REQUEST_FILENAME}!-d
RewriteRule ^([a-z]+)/([a-z\-]+)$ /$1/$2.php [L]