Website screenshots using PHP

Is there any way of taking a screenshot of a website in PHP, then saving it to a file?

separate different version of a website

I want to make sure I want to optimize and make my site very easy to maintain for different version of my site.

Cached, PHP generated Thumbnails load slow: How to find problem/solution from Waterfall graphs?

Question Part A ▉ (100 bountys, awarded)

Main question was how to make this site, load faster. First we needed to read these waterfalls. Thanks all for your suggestions on the waterfall readout analysis. Evident from the various waterfall graphs shown here is the main bottleneck: the PHP-generated thumbnails. The protocol-less jquery loading from CDN advised by David got my bounty, albeit making my site only 3% faster overall, and while not answering the site's main bottleneck. Time for for clarification of my question, and, another bounty:

Issue with mobile website

I have a mobile version of my site that I have an issue with. My main site is (let's say) domain.com and my mobile site is (let's say) m.dom.com

how to speed up website loading for opposite side of planet

I am currently running a small piece of PHP software which is being accessed by two groups of people, one group in China, the other in Ireland. The server is hosted in Ireland, and no doubt pages load between 0.3 and 0.8 seconds.

Android — How to programmatically log into website from a form

The app I am writing involves taking details from the user and using them to access their account on a website. I know how to take details from the user but I don't know how to use those details to log into the website. Does anyone know how I can input these details in the correct boxes? Thanks in advance