I would use WebSockets. Then you don't have to worry about timing or marking photos as used. The PHP microsite would get the photo from the app just as it is now, then the PHP microsite can send the photo out via WebSockets to every screen at the same time.
WebSockets! Of course! That's basically what they're designed for right? I'd completely forgotten they were a thing. This is exactly what I wanted to start a discussion like this. I'm the only developer at my company, so I don't have someone I can spitball ideas with; and I guess in this instance I forgot Google existed - haha.
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I would use WebSockets. Then you don't have to worry about timing or marking photos as used. The PHP microsite would get the photo from the app just as it is now, then the PHP microsite can send the photo out via WebSockets to every screen at the same time.
WebSockets! Of course! That's basically what they're designed for right? I'd completely forgotten they were a thing. This is exactly what I wanted to start a discussion like this. I'm the only developer at my company, so I don't have someone I can spitball ideas with; and I guess in this instance I forgot Google existed - haha.