I humbly request that scientific notation formatting (ex. 7.16e-11) is added to the function sprintf(). Currently I am using a function supplied by another user:

function sci($x, $d=-1) { 
	$e=floor(log10($x)); 
	$x*=pow(10,-$e); 
	$fmt=($d>=0)?".".$d:""; 
	$e=($e>=0)?"+".sprintf("%02d",$e):"-".sprintf("%02d",-$e); 
	return sprintf("%".$fmt."fe%s",$x,$e); 
}


and can be found in the comments of this page:
http://www.php.net/manual/en/function.sprintf.php

This function seems to be working fine for the time being, but this seems like somethine many other people would use and an addition to PHP itself would be better.