Hi, is there a way to protect my php code so that I could prevent others from redistributing or copying my script?

There is no way for others to see your php code. It is run on the server and is never sent to the users browser: Only the HTML part of the page is sent to the user.

but for erbmasters, they can easily read it, there is a program that can read files remotely

You thinking of obfuscators, the method to encrypt code in user unfriendly readability.
http://www.google.com/search?q=obfuscate+php

do you know how it is done?

As was said already, no-one can see your PHP code. Unless you are releasing some sort of software, that is.

I use a program called php lockit .. It is not anything close to best you can buy but it encrypts your code so others cant see the source if they are looking at the files through FTP and its cheap.

I will say if you use this software keep a back up as you cant undo what you have done .

Hope this helps

I have 3 moths to be programming using php. I liked. But i install wamp and after i have to put the files in the server. If another person use this computer and know about php , he will be able to use my code and scripts. I would like to make like an excecutable file to instal the program in tje machine. tI dont like the idea that other are able to open and read the code.

Can't you just compile your php scripts? If they can be decompiled easily(and I don't know if they can..) then like already stated, they need to be obfuscated. Only do this if you're trying to hide it from someone browsing your server files. Well, also if you're compiling to optimize, but that's irrelevant to this thread.