What is the current page?

I think I stumbled onto a function that will show what current page is loaded (index.php, single.php, etc.), but now that I actually need, I can’t find it anywhere.

This is what I’ve used in the past, but it’s pretty weird way to go about things.

// Get current page (easier way?)
$curstr = $_SERVER[‘QUERY_STRING’];
$curstr = explode(“&”,$curstr);
$curpage = explode(“=”,$curstr[0]);
$curpage = $curpage[1];

Any help would be appreciated,
Thanks

Dimitry