This is slightly off topic but is there anyway for me to completely hide this thread from showing up? For example, I never want to see it again regardless of updates in recent posts, php topic, etc.
If you use “Mute” on a thread, it (should) suppress all notifications on that thread, and stop it appearing in your “unread” list.
If you set “Mute” on a category (from your Profile preferences), it will suppress all notifications for that category - but I suspect only for new topics in that category. (I can’t remember for sure.)
It can be done the hard way with a user style, e.g. Stylish or similar extension depending on your browser. Each thread in the listing has a data-topic-id="SOME_ID" attribute on a <tr> in html so it’s easy to hide it with css.
And if you use Mute User, it simply hides all notifications from that user. You will still see their posts in the topic, but you will not get “Muted User replied to you”, or “Muted User sent you a PM” type notifications.