TrueBug PHP Encoder
- Available for Windows, allows the running of scripts under virtual hosting accounts with no change to the default PHP installation and requires no changes to the standard web server installation. [Commercial, Free trial]
- http://www.truebug.com/

Zend Guard
- Formerly known as Zend Encoder, protects PHP applications for secure deployment without exposing the source code. Website details additional products, certifications and a developer zone. [Commercial]
- http://www.zend.com/products/zend_guard

PHP Code Uglifiers
- Eliminates white spaces, line feeds and comments from PHP and JavaScript code with a command line tool. Features an online live test with an uploaded PHP file. [Commercial, Demo version available]
- http://www.all-dynamics.com/products/codeuglifier

phpObfuskator
- Renames variables, removes comments and white spaces from PHP files. Offered through Google Code with wiki information and known issues. [Open source, GPL]
- http://code.google.com/p/phpobfuskator/

Obfusc
- Obfuscates PHP code while providing full control over the obfuscation process. The software obscures strings and removes whitespaces and comments. Featured in the website are screen shots, sample obfuscations, FAQs and contact information. [Commercial]
- http://www.obfusc.com

RaizLabs
- Offers a free PHP obfuscator for Windows. Contains sample code, developer and support information as well as information about the design company. [Open Source, GPL]
- http://www.raizlabs.com/software/phpobfuscator/

ByteRun Protector for PHP
- PHP script encoder and trialware creator with a graphical interface with several editions available. The website also offers a web-based free PHP encoder accessible through a free membership as well as support through a newsletter and forum. [Commercial]
- http://www.byterun.com/php-protector.php

phpShield
- Converts PHP source code into unreadable bytecodes for Windows, Linux and Mac OS X. Website also includes full documentation and free loaders for supported platforms. [Commercial, Free trial]
- http://www.phpshield.com/

phpCipher
- Online PHP encoder with client management and licensing system. Knowledge base includes online support, user manual, sample code, and a demonstration of use. [Free for personal/non-commercial]
- http://www.phpcipher.com/

POBS
- Open source PHP and JavaScript obfuscator featuring renamings, concatenations comment deletions. Code no longer being maintained. Website offers advantages and disadvantages, debugging tips and sample usage. [Open Source, GPL]
- http://pobs.mywalhalla.net/

Thicket Obfuscator
- Commercial tool that obfuscates PHP source code, making it difficult to understand. Features a command line and visual interface. Website includes product news, other commercial services and additional software for a variety of languages. [Commercial, Tr
- http://www.semanticdesigns.com/Products/Obfuscators/PHPObfuscator.html

SourceGuardian
- Obfuscation and encryption for PHP files. Offers customizable constants, Zend extension support and encrypted IP addresses and domain names. Website includes upgrade information, testimonials, and loaders for supported platforms. [Commercial, Demo avai
- http://sourceguardian.com/

ionCube PHP Encoder
- Offers both a standalone download as well as an online service for encoding PHP scripts. Site features testimonials, commercial partners and support through request tickets and a forum. [Commercial, Free trial]
- http://www.ioncube.com/

CodeLock
- Obfuscates PHP code as well as the HTML output. Supports password protection, IP restriction, and the setting of expiry dates. Website also offers FAQs, demos, and a detailed explanation on how the encryption is performed. [Commercial, Free trial]
- http://www.codelock.co.nz/