在.htaccess中删除文件中的.php（如果此类文件不存在，则将用户重定向到自定义404页面）

Please i need a quick fix,

I have completed a site and I use .htaccess to rewrite the urls to remove .php with my intention for only known files i.e. if I have about.php then I can have /about it worked fine with the following .htaccess lines

Options -MultiViews
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ $1.php [L]

Now I created another line to handle custom 404 error

ErrorDocument 404 /404.html

Now here is the problem, I get 500 Internal Server Error upon navigating to unknown files instead of redirecting to 404....

Apache rewriting is somehow wield so i just dont have the time now, any help please

Thanks in anticipation

Well you should be able to go to the page without the .php, so if you have like a header file or config file, just put this code up top after session stuff. You can remove the rewrite rule.

if (substr($_SERVER['REQUEST_URI'], -4) === '.php') {
    require '404.php';
}