Trigger 500 Internal Server Error in PHP and display Apache error page

Question

How can i trigger 500 Internal Server Error or 404 Page Not Found Apache errors in PHP?

For 500 Internal Server Error i have tried

Answer 1

After such a knowledge-full discussion, i think there is no php code can display the by default 500 Internal Server Error. The solution is :
1. Create a folder named http500 next to the php file.
2. Create a .htaccess file in it and add following code :

    RewriteEngine On
    RewriteCond %{REQUEST_FILENAME} -d
    RewriteRule ^])(.(*/
    RewriteRule ^])((a-zA

1. PHP redirect code :

header('location : http500/');