Instiki is not available for PHP but there are some alternatives with similar functionality. The best PHP alternative is BookStack, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Instiki and five of them are available for PHP so hopefully you can find a suitable replacement. Other interesting PHP alternatives to Instiki are MediaWiki, Tiki Wiki CMS Groupware, Banana Dance Wiki/CMS and WikkaWiki.
BookStack is a free and open source knowledge management platform built on PHP. The system has been built around simplicity to ensure that adding information to it is not a chore. The content structure is built on the metaphors of Books, Chapters & Pages.
MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia. It is now used by several other projects of the non-profit Wikimedia Foundation and by many other wikis.
Tiki Wiki CMS Groupware is a full-featured, web-based, multilingual (40+ languages), tightly integrated, all-in-one Wiki+CMS+Groupware, Free Source Software (GNU/LGPL), using PHP + Smarty, MySQL, Zend Framework, jQuery and Bootstrap.
Free open source software combining the best of wiki and CMS with community building-features.
WikkaWiki is a flexible, standards-compliant and lightweight wiki engine written in PHP, which uses MySQL to store pages. Forked from WakkaWiki. Designed for speed, extensibility, and security. Released under the GPL license.
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