It would be nice to have strtolower() accept arrays as arguments (or just make a function such as ArrayToLower()).  For example:

$OUT["SomECapital"]="Whatever This Doesn't Matter";
echo $OUT["SomECapital"]; /* Works as expected */
$newOUT=strtolower($OUT);
/*

Currently the above line puts "Array" into $newOUT (like expected) , instead make this convert indexes with uppercase letters into lower case, so the line below would work and output the string "Whatever This Doesn't Matter"

*/
echo $newOUT["somecapital"];