PHP Doku:: Sortiert ein Array mittels einer benutzerdefinierten Vergleichsfunktion und behält Indexassoziationen bei - function.uasort.html

Verlauf / Chronik / History: (1) anzeigen

Sie sind hier:
Doku-StartseitePHP-HandbuchFunktionsreferenzVariablen- und typbezogene ErweiterungenArraysArray Funktionenuasort

Ein Service von Reinhard Neidl - Webprogrammierung.

Array Funktionen

<<sort

uksort>>

uasort

(PHP 4, PHP 5)

uasortSortiert ein Array mittels einer benutzerdefinierten Vergleichsfunktion und behält Indexassoziationen bei

Beschreibung

bool uasort ( array &$array , callback $cmp_function )

Diese Funktion sortiert ein Array so, dass die Beziehung der Indexe zu den Arrayelementen beibehalten bleibt. Dabei wird eine vom Benutzer definierte Vergleichsfunktion benutzt.

Dies wird hauptsächlich bei assoziativen Arrays angewandt, wenn die aktuelle Reihenfolge der Arrayelemente signifikant ist.

Parameter-Liste

array

Das zu sortierende Array.

cmp_function

Siehe usort() und uksort() für Beispiele benutzerdefinierter Vergleichsfunktionen.

Rückgabewerte

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

Beispiele

Beispiel #1 Einfaches uasort()-Beispiel

<?php
// Vergleichsfunktion
function cmp($a$b) {
    if (
$a == $b) {
        return 
0;
    }
    return (
$a $b) ? -1;
}

// Zu sortierendes Array
$array = array('a' => 4'b' => 8'c' => -1'd' => -9'e' => 2'f' => 5'g' => 3'h' => -4);
print_r($array);

// Sortieren und Ausgeben des Arrays
uasort($array'cmp');
print_r($array);
?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

Array
(
    [a] => 4
    [b] => 8
    [c] => -1
    [d] => -9
    [e] => 2
    [f] => 5
    [g] => 3
    [h] => -4
)
Array
(
    [d] => -9
    [h] => -4
    [c] => -1
    [e] => 2
    [g] => 3
    [a] => 4
    [f] => 5
    [b] => 8
)

Siehe auch


21 BenutzerBeiträge:
- Beiträge aktualisieren...
yannick dot battail at gmail dot com
17.11.2010 15:37
An Example using anonymous function.
Anonymous functions make some time the code easier to understand.
<?php
$fruits
= array('Orange9','Orange11','Orange10','Orange6','Orange15');
uasort ( $fruits , function ($a, $b) {
            return
strnatcmp($a,$b); // or other function/code
       
}
    );
print_r($fruits);
?>
returns
Array
(
    [3] => Orange6
    [0] => Orange9
    [2] => Orange10
    [1] => Orange11
    [4] => Orange15
)
magikMaker
19.10.2010 11:48
a quick reminder on the syntax if you want to use uasort in a Class or Object:

<?php

// procedural:
uasort($collection, 'my_sort_function');

// Object Oriented
uasort($collection, array($this, 'mySortMethod'));

// Objet Oriented with static method
uasort($collection, array('self', 'myStaticSortMethod'));

?>
Yves
8.10.2010 9:20
Took me some time to figure that out:
the user function must return an *integer*, if you return a float, you may not get the expected result.

<?php
  $a
= ('a' => 0.9, 'b' => 0.7, 'c' => 0.8);

  function
sorting($a, $b) { return $a - $b; }

 
// The function above will not =work, you have to

 
function sorting($a, $b)
  {
  
$d = $a = $b;
    return
$d < 0 ? -1 : ($d > 0 ? 1 : 0);
  }
?>
phire_sk
5.10.2010 23:19
I tried using some of the previous built multisorts, but they weren't working as expected.

So, I made my own Class, and it seems to work wonderfully.

Here is the code:

<?php
/************************************
*    Allows sorting multi-dimensional
*    arrays by a specific key and in
*    asc or desc order
**/
class multiSort
{
    var
$key;    //key in your array

    //runs the sort, and returns sorted array
   
function run ($myarray, $key_to_sort, $type_of_sort = '')
    {
       
$this->key = $key_to_sort;
       
        if (
$type_of_sort == 'desc')
           
uasort($myarray, array($this, 'myreverse_compare'));
        else
           
uasort($myarray, array($this, 'mycompare'));
           
        return
$myarray;
    }
   
   
//for ascending order
   
function mycompare($x, $y)
    {
        if (
$x[$this->key] == $y[$this->key] )
            return
0;
        else if (
$x[$this->key] < $y[$this->key] )
            return -
1;
        else
            return
1;
    }
   
   
//for descending order
   
function myreverse_compare($x, $y)
    {
        if (
$x[$this->key] == $y[$this->key] )
            return
0;
        else if (
$x[$this->key] > $y[$this->key] )
            return -
1;
        else
            return
1;
    }
}
?>
stephan dot hoyer at netresearch dot de
22.07.2010 14:17
To sort string containing Umlauts you can use this callback function:

<?php
   
function sortWUmlauts($s1, $s2)
    {
       
$search = array('Ä','Ö','Ü','ß');
       
$replace = array('A','O','U','s');
        return
strcmp(
          
str_ireplace($search, $replace, $s1),
          
str_ireplace($search, $replace, $s2)
           );
    }
?>

simply call:

<?php uasort($array, 'sortWUmlauts'); ?>
paul at webtop-designs dot com
30.11.2009 22:40
Just expanding on php arobase kochira period com's method:

If you are looking to sort a multi-D array by a specific column and have entries in both upper and lower case, simply drop the entries to lowercase before doing the strcmp.

<?php
$dirs
= array(
  array(
'name' => 'First Folder', 'path' => 'sompath'),
  array(
'name' => 'second folder', 'path' => 'sompath2'),
  array(
'name' => 'Third Folder', 'path' => 'sompath3')
);

function
so($a, $b) {
    return (
strcmp (strtolower($a['name']), strtolower($b['name'])));
}
?>
Alt_F4
10.10.2009 5:34
I couldn't work out a way to specify what element to sort by using the existing php functions - maybe I didn't look hard enough?? So i wrote my own multidimensional array sorting class.

<?php

$stock
= array(array("id" => 1,"item" => "hat",
                
"number" => 5,    "price" => 15),
                array(
"id" => 5,"item" => "shoes",
                
"number" => 1,    "price" => 50),
                array(
"id" => 3,"item" => "tie",
                
"number" => 2,    "price" => 30));
                
$sort = new multiSort();

//will sort the array by id in ascending order
print_r ($sort->sortArray($stock,'id','rcmp'));

//will sort the array by id in descending order
print_r ($sort->sortArray($stock,'id','cmp'));

//can also be used like so (specifying the index of the array)
print_r ($sort->sortArray($stock,'0','rcmp'));

//////////////////////////////////////////////////////

class multiSort {

    function
sortArray($array,$parameter,$_function) { return $this->_uasort($array,$_function,$parameter); }
   
    function
cmp ($a, $b, $p) { return (strcmp ($a[$p],$b[$p]));}
   
    function
rcmp ($a, $b, $p) { return -1 * (strcmp ($a[$p],$b[$p]));}
   
    function
_uasort($array,$func,$param) {
        for(
$i=0;$i<sizeof($array);$i++) {
           
$tmp = $i;
            for(
$j=1;$j<sizeof($array);$j++) {
               
$result = $this->$func($array[$tmp],$array[$j],$param);   
                if(
$result == -1) {
                   
$array = $this->arraySwap($array,$tmp,$j);
                   
$tmp = $j;
                }
            }
        }   
        return
$array;
    }
   
    function
arrayswap($arr, $src, $dst) {
       
$tmp = $arr[$dst];
       
$arr[$dst] = $arr[$src];
       
$arr[$src] = $tmp;
        return
$arr;
    }
}
//////////////////////////////////////////////////////////
?>

hope someone finds this useful.
php arobase kochira period com
8.06.2008 13:13
Difference between uasort() and usort(), the missing example ...

<?php
  $arr
= array ( 10 => array('id' => 'dix''aa' => '1010'),
               
100 => array('id' => 'cent', 'aa' => '100100'),
                 
2 => array('id' => 'deux', 'aa' => '22'),
                 
7 => array('id' => 'sept', 'aa' => '77'));

 
// id sorting
 
function so ($a, $b) { return (strcmp ($a['id'],$b['id']));    }
?>

*** uasort($arr, 'so') output:

<?php Array (
    [
100] => Array
        (
            [
id] => cent
           
[aa] => 100100
       
)

    [
2] => Array
        (
            [
id] => deux
           
[aa] => 22
       
)

    [
10] => Array
        (
            [
id] => dix
           
[aa] => 1010
       
)

    [
7] => Array
        (
            [
id] => sept
           
[aa] => 77
       
))?>

*** usort($arr, 'so') output:

<?php Array (
    [
0] => Array
        (
            [
id] => cent
           
[aa] => 100100
       
)

    [
1] => Array
        (
            [
id] => deux
           
[aa] => 22
       
)

    [
2] => Array
        (
            [
id] => dix
           
[aa] => 1010
       
)

    [
3] => Array
        (
            [
id] => sept
           
[aa] => 77
       
))?>
joeseed86 at gmail dot com
4.01.2007 18:54
Using uasort to alphabetically sort nested objects:

In this example, a "collection" object contains an array of "dataItem" objects which consist of a string name, a string attribute x and an arbitrary integer y.

This code allows you to sort the dataset by any of the dataItem attributes, or the order in which they were originally added to the set.

I'm using PHP 4.23 at work at the moment for legacy reasons, so I wrote the example following that object model.

<?php
class dataItem
{
    var
$name;
    var
$x;
   
   
//Constructor
   
function dataItem($name,$x,$y)
    {
       
$this->name = $name;
       
$this->x = $x;
       
$this->y = $y;
    }
}

class
collection
{
    var
$dataSet = array();
   
   
//Creates a new data item and adds it to our array
   
function add($name,$x,$y)
    {
       
$this->dataSet[] = new dataItem($name,$x,$y);
    }
   
   
//The wrapper sort function
   
function sortDataSet($s)
    {
       
//Sort by the given parameter
       
switch($s)
        {
            case
"name":
               
//Note use of array to reference member method of this object in callback
               
uasort($this->dataSet,array($this,"cmpName"));
                break;
           
            case
"x":
               
uasort($this->dataSet,array($this,"cmpX"));
                break;
               
            case
"y":
               
uasort($this->dataSet,array($this,"cmpY"));
                break;               
           
            case
"added":
            default:
               
//Re-sort array by original keys
               
ksort($this->dataSet);       
        }
    }

   
//Callback function for sorting by name
    //$a and $b are dataItem objects
   
function cmpName($a,$b)
    {
       
//Use sort() for simple alphabetical comparison
        //Convert to lowercase to ensure consistent behaviour
       
$sortable = array(strtolower($a->name),strtolower($b->name));
       
$sorted = $sortable;
       
sort($sorted);   
       
       
//If the names have switched position, return -1. Otherwise, return 1.
       
return ($sorted[0] == $sortable[0]) ? -1 : 1;
    }
   
   
//Callback function for sorting by x
    //$a and $b are dataItem objects
   
function cmpX($a,$b)
    {
       
//Use sort() for simple alphabetical comparison
        //Convert to lowercase to ensure consistent behaviour
       
$sortable = array(strtolower($a->x),strtolower($b->x));
       
$sorted = $sortable;
       
sort($sorted);   
       
       
//If the names have switched position, return -1. Otherwise, return 1.
       
return ($sorted[0] == $sortable[0]) ? -1 : 1;
    }
   
   
//Callback function for sorting by y
    //$a and $b are dataItem objects
   
function cmpY($a,$b)
    {       
       
//If $a's y attribute >= $b's y attribute, return 1. Otherwise, return -1.
       
return ($a->y >= $b->y) ? 1 : -1;
    }   

}

//Create a collection object
$myCollection = new collection();

//Add a few "records"
$myCollection->add("pancake","egg",7);
$myCollection->add("France","Paris",2);
$myCollection->add("Naked Gun","Leslie Nielsen",1);
$myCollection->add("OSX","huge icons",33);
$myCollection->add("telephone","keypad",-3);

//Test the output

//Sort by name:
$myCollection->sortDataSet("name");
print_r($myCollection->dataSet);

//Sort by x
$myCollection->sortDataSet("x");
print_r($myCollection->dataSet);

//Sort by y
$myCollection->sortDataSet("y");
print_r($myCollection->dataSet);

//Sort by order added
$myCollection->sortDataSet("added");
print_r($myCollection->dataSet);

?>

Will give this output (Anotated and re-formatted for ease of reading):

Sorted by name:
France         Paris            2
Naked Gun      Leslie Nielsen   1
OSX            huge icons       33
pancake        egg              7
telephone      keypad          -3

Sorted by x:
pancake        egg              7
OSX            huge icons       33
telephone      keypad          -3
Naked Gun      Leslie Nielsen   1
France         Paris            2

Sorted by y:
telephone      keypad          -3
Naked Gun      Leslie Nielsen   1
France         Paris            2
pancake        egg              7
OSX            huge icons       33

Sorted as added:
pancake        egg              7
France         Paris            2
Naked Gun      Leslie Nielsen   1
OSX            huge icons       33
telephone      keypad          -3

This is obviously a trivial case, but it can be very useful for larger data structures.
rlynch at lynchmarks dot com
17.05.2005 2:36
A subtle bug, corrected...

<?php
function masort(&$data, $sortby)
{
   static
$sort_funcs = array();
 
   if (empty(
$sort_funcs[$sortby])) {
      
$code = "\$c=0;";
       foreach (
split(',', $sortby) as $key) {
        
$array = array_pop($data);
        
array_push($data, $array);
         if(
is_numeric($array[$key]))
          
$code .= "if ( \$c = ((\$a['$key'] == \$b['$key']) ? 0:((\$a['$key'] < \$b['$key']) ? -1 : 1 )) ) return \$c;";
         else
          
$code .= "if ( (\$c = strcasecmp(\$a['$key'],\$b['$key'])) != 0 ) return \$c;\n";
       }
      
$code .= 'return $c;';
      
$sort_func = $sort_funcs[$sortby] = create_function('$a, $b', $code);
   } else {
      
$sort_func = $sort_funcs[$sortby];
   }
  
$sort_func = $sort_funcs[$sortby];
  
uasort($data, $sort_func);
}
?>

Note that

$code .= "if ( \$c = ((\$a['$key'] == \$b['$key']) ? 0:((\$a['$key'] < \$b['$key']) ? -1 : 1 )) ) return \$c;";

Has had the "return \$c" added.  Ultimately what the method is trying to accomplish is to build a chain of sort-order precedence.  But this requires each evaluation to short-circuit out with a return.  It was missing.

Peace
lucas dot karisny at linuxmail dot org
13.02.2005 3:09
The following is a modification of the dholme/messju masort func using david's float code with automatic data type detection.  As long as the value isn't a string numeral (I.E. "1", '13.4') this should sort strings and numbers without having to explicity set which they are.

<?php
function masort(&$data, $sortby)
{
   static
$sort_funcs = array();
 
   if (empty(
$sort_funcs[$sortby])) {
      
$code = "\$c=0;";
       foreach (
split(',', $sortby) as $key) {
        
$array = array_pop($data);
        
array_push($data, $array);
         if(
is_numeric($array[$key]))
          
$code .= "if ( \$c = ((\$a['$key'] == \$b['$key']) ? 0:((\$a['$key'] < \$b['$key']) ? -1 : 1 )) );";
         else
          
$code .= "if ( (\$c = strcasecmp(\$a['$key'],\$b['$key'])) != 0 ) return \$c;\n";
       }
      
$code .= 'return $c;';
      
$sort_func = $sort_funcs[$sortby] = create_function('$a, $b', $code);
   } else {
      
$sort_func = $sort_funcs[$sortby];
   }
  
$sort_func = $sort_funcs[$sortby];
  
uasort($data, $sort_func);
}
?>
siefer at sym dot net
4.10.2004 11:24
Hello naholyr at yahoo dot fr!

should it be

$cmp = create_function('$a, $b', "return $cmp_val;");

?

this works with my arrays ;-)

regards, Christopher
marek at lewczuk dot com
27.05.2004 13:01
Below another array sorting function - you can use many keys, whether order type is ascendant or descendant, if values of given key should be treat as string or numeric, if array keys should be preserved. This function is locale-safe - it means that string sorting will be based on setLocale settings. You should be aware that I did not make comprehensive tests, so be careful...

// my locales
SetLocale(LC_COLLATE,"pl_PL.UTF-8");
SetLocale(LC_CTYPE, "pl_PL.UTF-8");

function Array_Sort ($array, $arguments = Array(), $keys = true) {
      
  // comparing function code
  $code = "";
      
  // foreach sorting argument (array key)
  foreach ($arguments as $argument) {
          
    // order field
    $field = substr($argument, 2, strlen($argument));
          
    // sort type ("s" -> string, "n" -> numeric)
    $type = $argument[0];
          
    // sort order ("+" -> "ASC", "-" -> "DESC")
    $order = $argument[1];
              
    // add "if" statement, which checks if this argument  
       should be used
    $code .= "if (!Is_Numeric(\$result) || \$result == 0) ";
              
    // if "numeric" sort type
    if (strtolower($type) == "n") $code .= $order == "-" ? "\$result = (\$a['{$field}'] > \$b['{$field}'] ? -1 : (\$a['{$field}'] < \$b['{$field}'] ? 1 : 0));" : "\$result = (\$a['{$field}'] > \$b['{$field}'] ? 1 : (\$a['{$field}'] < \$b['{$field}'] ? -1 : 0));";
          
    // if "string" sort type
    else $code .= $order == "-" ? "\$result = strcoll(\$a['{$field}'], \$b['{$field}']) * -1;" : "\$result = strcoll(\$a['{$field}'], \$b['{$field}']);";
  }
           
  // return result
  $code .= "return \$result;";
  
  // create comparing function
  $compare = create_function('$a, $b', $code);
       
  // sort array and preserve keys
  if ($keys) uasort($array, $compare);
       
  // sort array, but not preserve keys
  else usort($array, $compare);
          
  // return array
  return $array;
}

Example array:
$array['sdsd'] = array("dir" => 1, "name" => "sas", "olek" => "sdsd");
$array['sds2'] = array("dir" => 2, "name" => "&#347;as", "olek" => "t");

Example - preserve keys:
print_r(Array_Sort($array, Array("s-name", "n-dir", "s+olek")));

Array
(
    [sds2] => Array
        (
            [dir] => 1
            [name] => &#347;as
            [olek] => t
        )

    [sdsd] => Array
        (
            [dir] => 1
            [name] => sas
            [olek] => sdsd
        )

)

Example - without preserving keys:
print_r(Array_Sort($array, Array("s-name", "n-dir", "s+olek")), false);

Array
(
    [0] => Array
        (
            [dir] => 1
            [name] => &#347;as
            [olek] => t
        )

    [1] => Array
        (
            [dir] => 1
            [name] => sas
            [olek] => sdsd
        )

)

Enyoj
david [__at__] castlelaing.com
10.05.2004 18:28
WARNING:-Regarding remmy.cjb.net (22-Oct-2003 05:57) mutisort() function:

Sorting by floating point numbers doesn't work in the current function. Use the modified version below if you want to sort by a floating point column.

<?php
// Based on the other notes given before.
// Sorts an array (you know the kind) by key
// and by the comparison operator you prefer.

// Note that instead of most important criteron first, it's
// least important criterion first.

// The default sort order is ascending, and the default sort
// type is strnatcmp.

// function multisort($array[, $key, $order, $type]...)
function multisort($array)
{
   for(
$i = 1; $i < func_num_args(); $i += 3)
   {
      
$key = func_get_arg($i);
       if (
is_string($key)) $key = '"'.$key.'"';
     
      
$order = true;
       if(
$i + 1 < func_num_args())
          
$order = func_get_arg($i + 1);
     
      
$type = 0;
       if(
$i + 2 < func_num_args())
          
$type = func_get_arg($i + 2);

       switch(
$type)
       {
           case
1: // Case insensitive natural.
              
$t = 'strcasecmp($a[' . $key . '], $b[' . $key . '])';
               break;
           case
2: // Numeric.
              
$t = '($a[' . $key . '] == $b[' . $key . ']) ? 0:(($a[' . $key . '] < $b[' . $key . ']) ? -1 : 1)';
               break;
           case
3: // Case sensitive string.
              
$t = 'strcmp($a[' . $key . '], $b[' . $key . '])';
               break;
           case
4: // Case insensitive string.
              
$t = 'strcasecmp($a[' . $key . '], $b[' . $key . '])';
               break;
           default:
// Case sensitive natural.
              
$t = 'strnatcmp($a[' . $key . '], $b[' . $key . '])';
               break;
       }
       echo
$t;
      
usort($array, create_function('$a, $b', '; return ' . ($order ? '' : '-') . '(' . $t . ');'));
   }
   return
$array;
}
?>
dn dot php at gmx dot de
24.11.2003 1:34
regarding remmy.cjb.net (22-Oct-2003 05:57) note:
The "multisort" function is not working. Try the following example.
( I hope this and your note will be deleted soon.)
..- Denis

<?php
$a
= array(
    array(
'c1' => 1, 'c2' => 1, 'c3' => 1, 'c4' => 1),
    array(
'c1' => 1, 'c2' => 1, 'c3' => 1, 'c4' => 2),
    array(
'c1' => 1, 'c2' => 1, 'c3' => 2, 'c4' => 1),
    array(
'c1' => 1, 'c2' => 1, 'c3' => 2, 'c4' => 2)
);

echo(
'<pre>');
print_r(multisort($a, "'c4'", true, 2,"'c3'", true, 2,"'c2'", true, 2,"'c1'", true, 2));
echo(
'</pre>');
?>
remmy.cjb.net
22.10.2003 8:57
Hope this helps!

- Remmy

<?php

// Based on the other notes given before.
// Sorts an array (you know the kind) by key
// and by the comparison operator you prefer.

// Note that instead of most important criteron first, it's
// least important criterion first.

// The default sort order is ascending, and the default sort
// type is strnatcmp.

// function multisort($array[, $key, $order, $type]...)
function multisort($array)
{
    for(
$i = 1; $i < func_num_args(); $i += 3)
    {
       
$key = func_get_arg($i);
       
       
$order = true;
        if(
$i + 1 < func_num_args())
           
$order = func_get_arg($i + 1);
       
       
$type = 0;
        if(
$i + 2 < func_num_args())
           
$type = func_get_arg($i + 2);

        switch(
$type)
        {
            case
1: // Case insensitive natural.
               
$t = 'strcasenatcmp($a[' . $key . '], $b[' . $key . '])';
                break;
            case
2: // Numeric.
               
$t = '$a[' . $key . '] - $b[' . $key . ']';
                break;
            case
3: // Case sensitive string.
               
$t = 'strcmp($a[' . $key . '], $b[' . $key . '])';
                break;
            case
4: // Case insensitive string.
               
$t = 'strcasecmp($a[' . $key . '], $b[' . $key . '])';
                break;
            default:
// Case sensitive natural.
               
$t = 'strnatcmp($a[' . $key . '], $b[' . $key . '])';
                break;
        }

       
uasort($array, create_function('$a, $b', 'return ' . ($order ? '' : '-') . '(' . $t . ');'));
    }

    return
$array;
}

$a = array(
    array(
'id' => 1, 'name' => 'apple'),
    array(
'id' => 2, 'name' => 'orange'),
    array(
'id' => 8, 'name' => 'banana'),
    array(
'id' => 8, 'name' => 'grapefruit'),
    array(
'id' => 9, 'name' => 'smoke'),
    array(
'id' => 1, 'name' => 'screen')
);

// This works like MYSQL 'ORDER BY id DESC, name ASC'
// Note the quoting of string literal keys.
echo('<pre>');
print_r(multisort($a, "'name'", true, 0, "'id'", false, 2));
echo(
'</pre>');

?>
cablehead
16.09.2003 18:08
dholmes we turned your masort function into a smarty plugin:

http://www.phpinsider.com/smarty-forum/viewtopic.php?t=1079

messju contributed the following performance improvements. 

function masort(&$data, $sortby)
{
    static $sort_funcs = array();
   
    if (empty($sort_funcs[$sortby])) {
        $code = "\$c=0;";
        foreach (split(',', $sortby) as $key) {
            $code .= "if ( (\$c = strcasecmp(\$a['$key'],\$b['$key'])) != 0 ) return \$c;\n";
        }
        $code .= 'return $c;';
        $sort_func = $sort_funcs[$sortby] = create_function('$a, $b', $code);
    } else {
        $sort_func = $sort_funcs[$sortby];
    }
    $sort_func = $sort_funcs[$sortby];
    uasort($data, $sort_func);
}

thank you for the cool function!
php at eden2 dot com
17.07.2003 13:36
Is it just me, or are the examples below misleading, and actually demonstrating situations that would be more appropriate for usort()?

After trying to make sense of the uasort() description, it sounds like it's more for sorting a 1D array like this:

"john" => "$23.12"
"tim" => "$6.50"
"bob" => "$18.54"

and getting back:

"tim" => "$6.50"
"bob" => "$18.54"
"john" => $23.12"

(assuming, of course, that your sort function is lopping off the $ and evaluating as a number -- which would complicate the use of asort() ;)
naholyr at yahoo dot fr
10.01.2003 18:35
You can sort a multidimensionnal array by any of its key with this function:

function multi_sort($array, $key)
{
  $cmp_val="((\$a['$key']>\$b['$key'])?1:
    ((\$a['$key']==\$b['$key'])?0:-1))";
  $cmp=create_function('$a, $b', "return $body;");
  uasort($array, $cmp);
  return $array;
}

example:
$myarray = array(
  array("name"=>"kernighan", "language"=>"c"),
  array("name"=>"lerdorf", "language"=>"php"),
  array("name"=>"Stroustrup", "language"=>"c++"),
  array("name"=>"Gosling", "language"=>"java")
);

multi_sort($myarray, "name") returns:
name=Gosling    language=java
name=Kernighan    language=c
name=Lerdorf    language=php
name=Stroustrup    language=c++
dholmes at jccc d0t net
9.10.2002 23:27
Here is a little sort function that actually uses a dynamic callback for usort to do it's thing.

It assumes your data is in the form of:
    $data = array(
            array('ID'=>'6','LAST'=>'Holmes','FIRST'=>'Dan'),
            array('ID'=>'1234','LAST'=>'Smith','FIRST'=>'Agent K'),
            array('ID'=>'2','LAST'=>'Smith','FIRST'=>'Agent J'),
            array('ID'=>'4','LAST'=>'Barney','FIRST'=>'Bob'));

Now, you want to sort on one or more cols, don't you? 

masort($data, 'LAST,FIRST');
or
masort($data,array('FIRST','ID'));

Of course you could add a bunch to it (like numeric comparison if appropriate, desc/asc, etc) but it works for me.

function masort(&$data, $sortby){
    if(is_array($sortby)){
        $sortby = join(',',$sortby);
    }

    uasort($data,create_function('$a,$b','$skeys = split(\',\',\''.$sortby.'\');
        foreach($skeys as $key){
            if( ($c = strcasecmp($a[$key],$b[$key])) != 0 ){
                return($c);
            }
        }
        return($c); '));
}
Notice that I am splitting the string in the comparison function? While this is certainly slower, it was the only way I would find to "pass" and "array".  If anyone has a better way, please suggest.  Then inside, we (string) compare the values only moving to the next key if the values are the same...and so on, and so on.
stilgar_cpsNOSPAM at zipmail dot NOSPAMcom dot br
5.09.2001 23:30
Use example:

$array[0]['Fator1']=7;
$array[0]['Fator2']="Name";
$array[1]['Fator1']=5;
$array[1]['Fator2']="Name";
$array[2]['Fator1']=7;
$array[2]['Fator2']="NameDiferente";
.....

We want to order by Fator1, then Fator2, then:

function Compare($ar1, $ar2)
{
   if ($ar1['Fator1']<$ar2['Fator1'])
      return -1;
   else if ($ar1['Fator1']>$ar2['Fator1'])
      return 1;
   if ($ar1['Fator2']<$ar2['Fator2'])
      return -1;
   else if ($ar1['Fator2']>$ar2['Fator2'])
      return 1;
   return 0;
}

To sort now, we use:

uasort($array, 'Compare');



PHP Powered Diese Seite bei php.net
The PHP manual text and comments are covered by the Creative Commons Attribution 3.0 License © the PHP Documentation Group - Impressum - mail("TO:Reinhard Neidl",...)