PHTML Encoder 

The PHTML Encoder allows encoding PHP scripts before distributing them. The script code is encrypted before saving. The PHTML Encoder includes console and GUI versions of converter. It is possible to combine protected/unprotected scripts in one site.
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SourceGuardian PHP Encoder 

SourceGuardian is the only serious choice for protecting and encrypting your PHP source code assets. With flexibility that other products only dream of Professional developers everywhere are using SourceGuardian products to distribute their scripts.
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ByteRun Protector for PHP 

Protect your PHP scripts from being pirated. Convert your PHP scripts to unreadable but still executable form.
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