Requirements

(The following information is cribbed from the README.md file that comes with SubjectsPlus.)

• PHP >= to 5.3 - 5.6
• MySQL >= 4 - 5.6
• Web server -- usually Apache, but some people have SubjectsPlus running on IIS
• JavaScript enabled for the admin to work properly.

If you run into any missing/weird functionality, check that the following extensions are enabled for PHP:

• cURL
• MySQL
• mbstring (not necessary, but you'll need to tweak header.php without this)
• simplexml (for reading RSS feeds)
• json (some data is stored as json)
• gettext (only if you need internationalization, aka translations)
• gd (image resizing--notably for headshots and generation of video thumbnails)

If you have MySQL 5.7 you must disable ONLY_FULL_GROUP_BY permanently. Please refer to this stack overflow issue.