Add PHP documentation lookup

[salcode]

The default Vim behavior is when you press Shift + k, the man page for the word under the cursor is displayed.

This behavior can be customized. I do a lot of work in PHP and I'm often looking up the order of parameters for functions like array_filter() and in_array().

I'd like to display the PHP help when I press Shift + k with the cursor over a PHP function.

[salcode]

This Vim plugin, PHP Manual, seems to do just that 👍 (and adds Ctrl + h, which opens the term in php.net)