array
A lot of people seem to trip up on this and ask me questions as to debugging. Bear in mind that this returns boolean, and does not return an array of affected items.
$array = array("One"=>1, "Three" => 3,"Two" =>2);
print_r(asort($array));
If successful, will return 1, and error if there is a string used. Useful to note so then people stop asking me :D
arsort
(PHP 4, PHP 5)
arsort — Ordena un array en orden inverso y mantiene la asociación de índices
Descripción
bool arsort
( array &$array
[, int $sort_flags = SORT_REGULAR
] )
Esta función ordena un array de manera que los índices del array mantienen su correlación con los elementos del array asociados.
Es usado principalmente cuando se ordenan arrays asociativos cuando el orden de los elementos es importante.
Parámetros
- array
-
El array de entrada.
- sort_flags
-
Se puede modificar el comportamiento del ordenado usando el parámetro opcional sort_flags, par más información vea sort().
Valores devueltos
Devuelve TRUE en caso de éxito o FALSE en caso de error.
Ejemplos
Example #1 Ejemplo de arsort()
<?php
$fruits = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple");
arsort($fruits);
foreach ($fruits as $key => $val) {
echo "$key = $val\n";
}
?>
El resultado del ejemplo sería:
a = orange d = lemon b = banana c = apple
Las frutas han sido ordenadas en orden inverso alfabético, se ha mantenido el índice asocidado con cada elemento.
Ver también
- asort() - Ordena un array y mantiene la asociación de índices
- comparación de funciones de orden de arrays
add a note
User Contributed Notes
arsort
jordancdarwin at googlemail dot com
15-Dec-2007 10:21
Scott Woods
02-Feb-2005 04:21
Note about "morgan at anomalyinc dot com"'s comment:
As of PHP4, you can just use array_multisort() to sort parallel or multi-dimensional arrays.
rodders_plonker at yahoo dot com
22-Aug-2000 01:43
I was having trouble with the arsort() function on an older version of PHP which was returning an error along the lines of 'wrong perameter count for function arsort' when I tried to use a flag for numeric sorting (2/SORT_NUMERIC).
I figured, as I only wanted to sort integers, I could pad numbers from the left to a specific length with 0's (using the lpad function provided by improv@magma.ca in the notes at http://www.php.net/manual/ref.strings.php).
A string sort then correctly sorts numerically (i.e. {30,2,10,21} becomes {030,021,010,002} not {30,21,2,10}) when echoing the number an (int)$string_name hides the leading 0's.
Made my day :).
Rodders.
morgan at anomalyinc dot com
25-Nov-1999 03:30
If you need to sort a multi-demension array, for example, an array such as
$TeamInfo[$TeamID]["WinRecord"]
$TeamInfo[$TeamID]["LossRecord"]
$TeamInfo[$TeamID]["TieRecord"]
$TeamInfo[$TeamID]["GoalDiff"]
$TeamInfo[$TeamID]["TeamPoints"]
and you have say, 100 teams here, and want to sort by "TeamPoints":
first, create your multi-dimensional array. Now, create another, single dimension array populated with the scores from the first array, and with indexes of corresponding team_id... ie
$foo[25] = 14
$foo[47] = 42
or whatever.
Now, asort or arsort the second array.
Since the array is now sorted by score or wins/losses or whatever you put in it, the indices are all hoopajooped.
If you just walk through the array, grabbing the index of each entry, (look at the asort example. that for loop does just that) then the index you get will point right back to one of the values of the multi-dimensional array.
Not sure if that's clear, but mail me if it isn't...
-mo