key
To create a natural reverse sorting by keys, use the following function:
<?php
function natkrsort($array)
{
$keys = array_keys($array);
natsort($keys);
foreach ($keys as $k)
{
$new_array[$k] = $array[$k];
}
$new_array = array_reverse($new_array, true);
return $new_array;
}
?>
krsort
(PHP 4, PHP 5)
krsort — Ordina rispetto alle chiavi di un array in ordine inverso
Descrizione
bool krsort
( array $array
[, int $sort_flags
] )
Ordina un array rispetto alle sue chiavi, in ordine inverso, mantenendo le associazioni. Questa funzione è utile con gli array associativi.
Restituisce TRUE in caso di successo, FALSE in caso di fallimento.
Example #1 Esempio di krsort()
<?php
$frutti = array("d"=>"limone", "a"=>"arancio", "b"=>"banana", "c"=>"mela");
krsort($frutti);
reset($frutti);
while (list($chiave, $valore) = each($frutti)) {
echo "$chiave = $valore\n";
}
?>
Questo esempio mostrerà :
d = limone c = mela b = banana a = arancio
Si può modificare il comportamento dell'ordinamento usando il parametro opzionale sort_flags , per ulteriori dettagli vedere sort().
Vedere anche asort(), arsort(), ksort(), sort(), natsort() e rsort().
add a note
User Contributed Noteskrsort
08-Aug-2005 03:37
peter at pmkmedia dot com
07-Nov-2003 10:51
07-Nov-2003 10:51
Best deal sorting:
This is a function that will sort an array with integer keys (weight) and float values (cost) and delete 'bad deals' - entries that are more costly than other entries that have greater or equal weight.
Input: an array of unsorted weight/cost pairs
Output: none
function BEST_DEALS($myarray)
{ // most weight for least cost:
// © Peter Kionga-Kamau, http://www.pmkmedia.com
// thanks to Nafeh for the reversal trick
// free for unrestricted use.
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);
}
lolo at phpheaven dot net
28-Nov-2000 09:33
28-Nov-2000 09:33
If you want to emulate the krsort function for an older version of php, you can use this piece of code:
function KeyComp($a, $b)
{
return -(strcmp($a,$b));
}
function krsort($MyArray)
{
uksort($MyArray, "KeyComp");
}
Maybe obvious and useless, but who knows...