Isn't this just the
PHP Diary Thread, with a new less clear name?
What you describe is a weblog, aka a website journal or diary website. Weblogs have existed since some of the first web pages and web sites in 1992. Now we have software the handles the minutia of tracking and managing weblogs:
blogger,
wordpress,
slashcode,
MovableType.
Perhaps you are interesting in a particular view of the weblog, or just creating a specific layout (via custom CSS or a theme package) but a PHP/MySQL/Web-whatever diary is a weblog. If this is the case you should look at
W3C's Guide to Cascading Style Sheets.