You can do this by making little changes to your apache .htacess.
It's fun. You can show customer.php as customer.asp or customer.manish ( here Manish is my name).
You can use it in your production but
In general, security by obscurity is one of the weakest forms of security. But in some cases, every little bit of extra security is desirable.
A few simple techniques can help to hide PHP, possibly slowing down an attacker who is attempting to discover weaknesses in your system. By setting expose_php to off in your php.ini file, you reduce the amount of information available to them.
You can learn more about here...
# Make PHP code look like unknown types
AddType application/x-httpd-php .bop .foo .133t
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