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Last updated: Fri, 18 May 2012

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ksort

(PHP 4, PHP 5)

ksort — Sortiert ein Array nach Schlüsseln

Beschreibung

bool ksort ( array &$array [, int $sort_flags = SORT_REGULAR ] )

Sortiert ein Array nach Schlüsseln, wobei die Zuordnungen zwischen Schlüssel und Wert erhalten bleiben. Dies ist hauptsächlich bei assoziativen Arrays hilfreich.

Parameter-Liste

array

Das Eingabe-Array.

sort_flags

Sie können das Verhalten der Sortierung mittels dem optionalen Parameter sort_flags beeinflussen, für Details siehe sort().

Rückgabewerte

Gibt bei Erfolg TRUE zurück. Im Fehlerfall wird FALSE zurückgegeben.

Beispiele

Beispiel #1 ksort()-Beispiel

<?php
$fruits = array("d" => "Zitrone", "a" => "Orange", "b" => "Banane", "c" => "Apfel");
ksort($fruits);
foreach ($fruits as $key => $val) {
    echo "$key = $val\n";
}
?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

a = Orange
b = Banane
c = Apfel
d = Zitrone

Siehe auch



add a note add a note User Contributed Notes
ksort
don dot hosek at gmail dot com
25-May-2007 03:37
It's worth noting that ksort is also handy if you want to be able to do manipulations on an numerically-keyed array which may not have been initialized in numerical order:

$a[2]=7;
$a[0]=1;
$a[1]=6;

foreach($a as $b) {
  echo "$b ";
}

$a = ksort($a);

foreach($a as $b) {
  echo "$b ";
}
06-Nov-2006 02:26
Why not just use built-in PHP functions? You can do an in-place natural sort by keys with:

uksort($array, 'strnatcasecmp');
richard dot quadling at bandvulc dot co dot uk
24-Oct-2005 10:10
Just to complete the comments made by ssb45.

If the supplied array is an empty array, the value returned is NOT an array.

All that is required is to pre-initialize the result.

function natksort(&$aToBeSorted)
    {
    $aResult = array();
    $aKeys = array_keys($aToBeSorted);
    natcasesort($aKeys);
    foreach ($aKeys as $sKey)
        {
        $aResult[$sKey] = $aToBeSorted[$sKey];
        }
    $aToBeSorted = $aResult;
    return True;
    }
ssb45 at cornell dot edu
30-Jun-2005 01:58
The function that justin at booleangate dot org provides works well, but be aware that it is not a drop-in replacement for ksort as is.  While ksort sorts the array by reference and returns a status boolean, natksort returns the sorted array, leaving the original untouched.  Thus, you must use this syntax:

$array = natksort($array);

If you want to use the more natural syntax:

$status = natksort($array);

Then use this modified version:

function natksort(&$array) {
    $keys = array_keys($array);
    natcasesort($keys);

    foreach ($keys as $k) {
        $new_array[$k] = $array[$k];
    }

    $array = $new_array;
    return true;
}
justin at booleangate dot org
18-Jan-2005 10:04
Here's a handy function for natural order sorting on keys.

function natksort($array) {
  // Like ksort but uses natural sort instead
  $keys = array_keys($array);
  natsort($keys);

  foreach ($keys as $k)
    $new_array[$k] = $array[$k];

  return $new_array;
}
yaroukh at email dot cz
06-May-2004 05:08
I believe documentation should mention which of array-functions do reset the internal pointer; this one does so ...
pedromartinez at alquimiapaginas dot com
29-Nov-2003 04:58
A list of directories can be listed sorted by date (newer first) with this script. This is usefull if the directories contain (for example) pictures and you want the newer to appear first.

$maindir = "." ;
$mydir = opendir($maindir) ;

// SORT
$directorios = array();
while (false !== ($fn = readdir($mydir)))
{
    if (is_dir($fn) && $fn != "." && $fn != "..")
    {
        $directory = getcwd()."/$fn";
        $key = date("Y\-m\-d\-His ", filectime($directory));
        $directorios[$key] = $directory;
    }
}

ksort($directorios);
$cronosdir = array();
$cronosdir = array_reverse($directorios);

while (list($key, $directory) = each($cronosdir)) {
    echo "$key = $directory<bR>";
}

Pedro
09-Mar-2002 04:09
here 2 functions to ksort/uksort an array and all its member arrays

function tksort(&$array)
  {
  ksort($array);
  foreach(array_keys($array) as $k)
    {
    if(gettype($array[$k])=="array")
      {
      tksort($array[$k]);
      }
    }
  }

function utksort(&$array, $function)
  {
  uksort($array, $function);
  foreach(array_keys($array) as $k)
    {
    if(gettype($array[$k])=="array")
      {
      utksort($array[$k], $function);
      }
    }
  }
delvach at mail dot com
06-Nov-2001 10:29
A real quick way to do a case-insensitive sort of an array keyed by strings:

uksort($myArray, "strnatcasecmp");
sbarnum at mac dot com
20-Oct-2001 12:54
ksort on an array with negative integers as keys yields some odd results.  Not sure if this is a bad idea (negative key values) or what.
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list> <krsort
Last updated: Fri, 18 May 2012