arsort

(PHP 4, PHP 5)

arsort — Sorterer et array i omvendt rækkefølge og lader nøglerne følge med deres værdier

Beskrivelse

bool arsort ( array &$array [, int $sort_flags ] )

Denne funktion sorterer et array og lader nøglerne følge med deres værdier, som de er sat sammen med. Denne funktion er mest brugt til at sortere associative med hvor elementernes rækkefølge er vigtig.

Returnerer TRUE ved succes, FALSE ved fejl.

Example#1 arsort() eksempel


<?php
$fruits = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple");
arsort($fruits);
reset($fruits);
while (list($key, $val) = each($fruits)) {
    echo "$key = $val\n";
}
?>

Ovenstående eksempel vil udskrive:

a = orange
d = lemon
b = banana
c = apple

Frugterne er blevet sorteret i omvendt alfabetisk rækkefølge og nøglen er flyttet med hver enkelt element.

Du kan ændre måde funktionen skal sorterer på, ved brug af den valgfrie parameter sort_flags . Læs mere ved sort() funktionen.

Se også asort(), rsort(), ksort() og sort().

asort

array

Last updated: Sun, 25 Nov 2007

add a note User Contributed Notes
arsort

jordancdarwin at googlemail dot com
15-Dec-2007 10:21


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

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

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asort

array

Last updated: Sun, 25 Nov 2007