I currently have a 404.php page from a certain theme I'm using but I would like to override any WP foncutionaly regarding 404 errors.
I would like to set a 404 error handler via my .htaccess but for some reason wordpress is still serving it's 404 page.
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
**ErrorDocument 404 /home/username/public_html/my404page.php?next=**
</IfModule>
# END WordPress