have you tried phplockit? is very easy to use, this is the description

Encrypt and encode PHP scripts easily and quickly. Use it for encrypting your scripts for distribution, or protecting sensitive information such as MySQL username/password.

Encoded scripts work with PHP Linux/Unix and Windows servers. Encoder runs on Windows systems.

No additional software required on the PHP server. PHP safe mode friendly, and works with any version of PHP 4.0 onwards.

Optionally compress your scripts to save disc space, lock to IP addresses, lock to domains or set expiry date

you can do all these things

- Works with any installation of PHP 4 or PHP 5.
- No additional software needs to be installed on the server (yours or your customers).
- Encoded scripts work on Windows and Linux servers.
- No changes are requred to the web server.
- Works with PHP safe mode enabled.
- Obfuscates PHP files.
- Encrypts PHP files.
- Works with - Protects sensitive information (such as your MySQL password) in PHP scripts.
- Encrypt entire directory trees in one go.
- Allows encryption of "include" files.
- Script compression reduces disc space requirements (requires PHP zlib module to be installed on the server).
- Uses a unique key to encrypt scripts.
- Allows optional locking of scripts to an IP address or multiple IP addresses.
- Allows optional lock of scripts to a domain or multiple domains.
- Allows optional expiry date to be set, providing time limited licenses.
- Incredibly light resource usage.
- Runs incredibly fast, with no noticable delay to your scripts.
- Easy to setup and use.
- Unlimited encryption for a single payment.
- Built-in help
- Does not require write access to any directories or files on the server.
- Your encoded scripts can contain customised error messages.
- Allows files to be excluded from encryption (e.g. configuration files).
- Optionally allows a beginning section of a script to be unencrypted (e.g. for configuration).
- Optionally strip comments and whitespace from your script.

i search that, but it costs $ 29.99 that sucks

i wants something like this:

High Security PHP Encoder

Stops unauthorized personnel from reading, modifying and reverse engineering your code. Improves security by preventing hackers from analyzing your source code.
Online Licensing Module

Generates small encrypted license files that act as keys to your software. Only unlocks software on domains or IP addresses specified by you. Powerful API allows you to distribute licenses from your website without additional server side software.
Client Management System

Free client management system for developers who do not have such a system in place. Easily sell scripts from your website by installing our Logics Client Management System on your server. Fully automated system allows you to manage everything from one place.

well if you want a free php encoder to protect your php code php and encrypt your scripts. you should try this

http://www.wallpaperama.com/forums/how-to-encrypt-php-scripts-code-files-free-php-encoder-t381.html

The other day i was looking for a way to encode my php scripts, in my search, i found three choices:

1. Zend Guard™ is available for $995 USD as a yearly subscription license.

2. Ioncube PHP Encoder: Starts at $199 USD

3. SourceCop : $30 USD

4. SourceGuardian™ : $250 USD

5. Turck MMCache: FREE [download at sourceforge]

http://turck-mmcache.sourceforge.net/index_old.html

Ofcourse, you pay for what you get. If I could afford it, I would go with Zend.

what is What is Turck MMCache?

visit their website


http://turck-mmcache.sourceforge.net/index_old.html


What is Turck MMCache?
Turck MMCache is a free open source PHP accelerator, optimizer, encoder and dynamic content cache for PHP. It increases performance of PHP scripts by caching them in compiled state, so that the overhead of compiling is almost completely eliminated. Also it uses some optimizations to speed up execution of PHP scripts. Turck MMCache typically reduces server load and increases the speed of your PHP code by 1-10 times.

Turck MMCache stores compiled PHP scripts in shared memory and execute code directly from it. It creates locks only for short time while search compiled PHP script in the cache, so one script can be executed simultaneously by several engines. MM shared memory library (http://www.engelschall.com/sw/mm/) was used by Turck MMCache before version 2.3.13 for management of shared memory and locking. Files those can't fit in shared memory are cached on disk only.
Turck MMCache was first launched in 2001 to speed up the www.guestbooks4all.com service. It has been tested under PHP 4.1.0-4.3.3 under GNU/Linux and Windows with Apache 1,3 and 2.0. Patches for ports to other OSs and PHP versions are welcome

Since version 2.3.10, Turck MMCache contains a PHP encoder and loader. You can encode PHP scripts using encoder.php in order to distribute them without sources. Encoded files can be run on any site which runs PHP with Turck MMCache 2.3.10 or above. The sources of encoded scripts can't be restored because they are stored in a compiled form and the encoded version doesn't contain the source. Of course, some internals of the scripts can be restored with different reverse engineering tools (disassemblers, debuggers, etc), but it is not trivial.

Since version 2.3.15, Turck MMCache is compatible with Zend Optimizer's loader. Zend Optimizer must be installed after Turck MMCache in php.ini. If you don't use scripts encoded with Zend Encoder then we do not recommend you install Zend Optimizer with Turck MMCache.

Turck MMCache does not work in CGI mode.

Here are some other products that provide the same functionality:

* Zend Performance Suite
* PHP Accelerator
* Alternative PHP Cache
* AfterBurner Cache

The following table shows benchmark result for different opcode caches. It was made on the start page of phpMyAdmin 2.5.1 with Apache Benchmark program.

Test Command - "/usr/sbin/ab "http://server/phpMyAdmin-2.5.1/index.php" -n200 -c1 -dS"
Server - 2 x PIII 800MHz, RAM 512MB, Net 100Mb, RedHat Linux 7.3, Linux 2.4.18, PHP 4.1.2, Apache 1.3.27
Test Host - 2 x PIII 1GHz, RAM 1GB, Net 100Mb, Linux 2.4.18