highest

I'm trying to create a program that calculates and displays the highest, lowest and average value of items in a listbox (items generated from a txt file). I finally figured out how to load a text file to the listbox. I have been searching for clues for about an hour and all my attempts have brought me to a dead end. my listbox is called readListbox and my Highest, Lowest and Average labels are called highestLabel, lowestLabel and averageLabel respectively. How do I go about creting this program. The numbers are in the decimal format. Any Help will be very much appreciated. private void

How can I get with PHP the highest key/index in an array? I know how to do it for the values. E.g. From this array I would like to get "10" as an integer value: $arr = array( 1 => "A", 10 => "B", 5 => "C" ); I know how I could program it, but I was asking myself if there as a function for this as well. This should work fine $arr = array( 1 => "A", 10 => "B", 5 => "C" ); max(array_keys($arr)); You can get the maximum key this way: <?php $arr = array("a"=>"test", "b"=>"ztest"); $max = max(array_keys($arr)); ?> $keys = array_keys($arr); $keys = rsort($keys); print $keys[0]; should print "10" Try