Multisite sites output on a single page

Question

Basically I have a multisite setup where each site is just one single page (each has a different theme). How can I output that page content of any site on a page of the main site programmatically?

Like I have multisite on domain.com and I have sites like a.domain.com and b.domain.com, then how can I show the content on lets say domain.com/api/main programmatically?

I need clues on how can I go about it? Output buffering in some way? Mainly I only need the widgets to work. Don't need the is_* functions as its just one page site.

Its like I want to view the content of diff sites on a single page by passing on parameters upon checking of which it is figured out which site of the multisite needs to be shown at this request & then that site is shown as if it was opened by its URL. Right now upon receiving the request on domain.com/api/main, I am redirecting to the site URL (a.domain.com or b.domain.com) but I would like to render the output on a single URL only. Any clues?

Answer 1

I did this for a while on my own Multisite network. Essentially, I had one site that was a central "hub" for all the others and pulled in content from the entire network.

It's not easy, but it can be done. One approach (the approach I used at the time) used a plugin to automatically re-post content from each site on the central "hub" site. The plugin is called Sitewide Tags and was originally intended to enable network-wide content searching.

A couple of talented WordPress users put together an ebook that details how to use the plugin, how to configure your network, and how to create "Network Homepages" similar to what you're asking for.

You can buy the ebook here.

Note: This is not my ebook and not an affiliate link. I used this ebook while setting up my own network "hub" site, which is why I'm comfortable recommending it.