phpShield has been discontinued. Similar apps include Sourceguardian. It's paid, but phpBolt.com is free. Other options are Transfon Swoole Compiler. In total there are three apps like phpShield for Linux, Mac, Windows and the web.
SourceGuardian for PHP allows you to quickly and securely encode, compile and encrypt your PHP files to protect not only your intellectual property, but also sensitive information such as database passwords.
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Transfon Swoole Compiler (TSC) is a PHP source code encryption, code-protection and licensing solutions, including PHP code compiler and PHP code loader. It is designed for plugins or extension developers to protect source code and manage licenses.
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