This function will sort an array with integer keys (weight) and float values (cost) and delete 'bad deals' - entries that are more costly than other entries that have greater or equal weight.
Possible uses: parse out best deals on shipping (weight/cost), best deals on goods (amount/price), etc.
By : mugane
function BEST_DEALS(&$myarray)
{
/*
Most weight for least cost:
© Peter Kionga-Kamau, http://www.pmkmedia.com
Thanks to Nafeh for the reversal trick
Free for unrestricted use.
This is a function that will sort an array with integer
keys (weight) and float values (cost) and delete 'bad
deals' - entries that are more costly than other entries
that have greater or equal weight.
Input: an array of unsorted weight/cost pairs
Output: none
*/
krsort($myarray, SORT_NUMERIC);
while(list($weight, $cost) = each($myarray))
{ // delete bad deals, retain best deals:
if(!$lastweight)
{
$lastweight=$weight;
$lastcost = $cost;
}
else if($cost >= $lastcost)
{
unset($myarray[$weight]);
}
else
{
$lastweight=$weight;
$lastcost = $cost;
}
}
ksort($myarray);
}
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