How to encrypt my HTML, PHP & JavaScript?

Neither html nor javascript can be encrypted, else the browsers would not be able to interprete it and your visitors would not be able to view your site. Dot. End. Compression tools may boost performance a little but will not really help against copyright infringement.

Your php-programs generate html, your visitors will always be able to see your html, but if your server is configured properly no one should ever see your php.

The solution for this is to use ajax. When you use javascript, it's processing is done on browser side whereas you are trying to produce php based on browser side rendering that's not possible since php is server side PreProcessor.

As @waldol1 said you can use Ajax and call async requests for interacting with Server/Database.

I would create S/MIME public/private keypairs using OpenSSL and then use the OpenSSL command to do the encryption & decryption. I believe that this is superior to using PGP because openssl is included with most linux operating systems and PGP isn't. OpenSSL is also standards-based and generally easier to work with, once you have the commands down.

I recommended against a "pure-PHP" solution (by pure-PHP I mean doing the crypto in PHP, rather than using PHP to call an existing library or a separate executable). You don't want to do bulk crypto in PHP. Too slow. And you want to use OpenSSL, because it's high performance and the security is well understood.

Here's the magic.

To make an X.509 key:

$subj="/C=US/ST=California/L=Remote/O=Country Govt./OU=My Dept/CN=Mr. Agent/[email protected]"
openssl req -x509 -newkey rsa:1024 -keyout mycert.key -out mycert.pem -nodes -subj $subj

That puts the private key in mycert.key and the public key in mycert.pem. The private key is not password protected.

Now, to sign a message with S/MIME:

openssl smime -sign -signer mycert.pem -inkey mycert.key <input >output

To encrypt a message with S/MIME:

openssl smime -encrypt -recip yourcert.pem <input >output

To decrypt a message with S/MIME:

openssl smime -decrypt -inkey mycert.key -certfile mycert.pem <input >output

I also have some demos on using OpenSSL from the C language bindings, but not from PHP.