array_merge
There have to be two corrections to the php_multisort($data,$keys)
// Sort Expression
$i=0;
$sort=''; //here
foreach ($keys as $k){
if($i>0){$sort.=',';}
$sort.='$cols[\''.$k['key'].'\']'; //and here
if($k['sort']){$sort.=',SORT_'.strtoupper($k['sort']);}
if($k['type']){$sort.=',SORT_'.strtoupper($k['type']);}
$i++;
}
array_multisort
(PHP 4, PHP 5)
array_multisort — Sort multiple or multi-dimensional arrays
Description
array_multisort() can be used to sort several arrays at once, or a multi-dimensional array by one or more dimensions.
Associative (string) keys will be maintained, but numeric keys will be re-indexed.
Parameters
Return Values
Returns TRUE on success or FALSE on failure.
Examples
Example #1 Sorting multiple arrays
<?php
$ar1 = array(10, 100, 100, 0);
$ar2 = array(1, 3, 2, 4);
array_multisort($ar1, $ar2);
var_dump($ar1);
var_dump($ar2);
?>
In this example, after sorting, the first array will contain 0, 10, 100, 100. The second array will contain 4, 1, 2, 3. The entries in the second array corresponding to the identical entries in the first array (100 and 100) were sorted as well.
array(4) { [0]=> int(0) [1]=> int(10) [2]=> int(100) [3]=> int(100) } array(4) { [0]=> int(4) [1]=> int(1) [2]=> int(2) [3]=> int(3) }
Example #2 Sorting multi-dimensional array
<?php
$ar = array(
array("10", 11, 100, 100, "a"),
array( 1, 2, "2", 3, 1)
);
array_multisort($ar[0], SORT_ASC, SORT_STRING,
$ar[1], SORT_NUMERIC, SORT_DESC);
var_dump($ar);
?>
In this example, after sorting, the first array will transform to "10", 100, 100, 11, "a" (it was sorted as strings in ascending order). The second will contain 1, 3, "2", 2, 1 (sorted as numbers, in descending order).
array(2) { [0]=> array(5) { [0]=> string(2) "10" [1]=> int(100) [2]=> int(100) [3]=> int(11) [4]=> string(1) "a" } [1]=> array(5) { [0]=> int(1) [1]=> int(3) [2]=> string(1) "2" [3]=> int(2) [4]=> int(1) } }
Example #3 Sorting database results
For this example, each element in the data array represents one row in a table. This type of dataset is typical of database records.
Example data:
volume | edition -------+-------- 67 | 2 86 | 1 85 | 6 98 | 2 86 | 6 67 | 7
The data as an array, called data. This would usually, for example, be obtained by looping with mysql_fetch_assoc().
<?php
$data[] = array('volume' => 67, 'edition' => 2);
$data[] = array('volume' => 86, 'edition' => 1);
$data[] = array('volume' => 85, 'edition' => 6);
$data[] = array('volume' => 98, 'edition' => 2);
$data[] = array('volume' => 86, 'edition' => 6);
$data[] = array('volume' => 67, 'edition' => 7);
?>
In this example, we will order by volume descending, edition ascending.
We have an array of rows, but array_multisort() requires an array of columns, so we use the below code to obtain the columns, then perform the sorting.
<?php
// Obtain a list of columns
foreach ($data as $key => $row) {
$volume[$key] = $row['volume'];
$edition[$key] = $row['edition'];
}
// Sort the data with volume descending, edition ascending
// Add $data as the last parameter, to sort by the common key
array_multisort($volume, SORT_DESC, $edition, SORT_ASC, $data);
?>
The dataset is now sorted, and will look like this:
volume | edition -------+-------- 98 | 2 86 | 1 86 | 6 85 | 6 67 | 2 67 | 7
Example #4 Case insensitive sorting
Both SORT_STRING and SORT_REGULAR are case sensitive, strings starting with a capital letter will come before strings starting with a lowercase letter.
To perform a case insensitive search, force the sorting order to be determined by a lowercase copy of the original array.
<?php
$array = array('Alpha', 'atomic', 'Beta', 'bank');
$array_lowercase = array_map('strtolower', $array);
array_multisort($array_lowercase, SORT_ASC, SORT_STRING, $array);
print_r($array);
?>
The above example will output:
Array ( [0] => Alpha [1] => atomic [2] => bank [3] => Beta )
add a note
User Contributed Notesarray_multisort
seiffs_at_centrum-dot-cz
18-Aug-2008 04:53
18-Aug-2008 04:53
php {dot} net [arrt] sebble.com
11-May-2008 10:16
11-May-2008 10:16
I was requiring a PHP function a sort my array data as part of an SQL interpreter for PHP arrays. This is the code I came up with. and works wonderfully.
I hope this helps somebody. If anyone uses this, let me know what you think, if there are any problems with it...
<?
## ##
## PHPMultiSort ##
## ##
// Takes:
// $data, multidim array
// $keys, array(array(key=>col1, sort=>desc), array(key=>col2, type=>numeric))
function php_multisort($data,$keys){
// List As Columns
foreach ($data as $key => $row) {
foreach ($keys as $k){
$cols[$k['key']][$key] = $row[$k['key']];
}
}
// List original keys
$idkeys=array_keys($data);
// Sort Expression
$i=0;
foreach ($keys as $k){
if($i>0){$sort.=',';}
$sort.='$cols['.$k['key'].']';
if($k['sort']){$sort.=',SORT_'.strtoupper($k['sort']);}
if($k['type']){$sort.=',SORT_'.strtoupper($k['type']);}
$i++;
}
$sort.=',$idkeys';
// Sort Funct
$sort='array_multisort('.$sort.');';
eval($sort);
// Rebuild Full Array
foreach($idkeys as $idkey){
$result[$idkey]=$data[$idkey];
}
return $result;
}
###############
// Example Data
$_DATA['table1'][] = array("name" => "Sebastian", "age" => 18, "male" => true);
$_DATA['table1'][] = array("name" => "Lawrence", "age" => 16, "male" => true);
$_DATA['table1'][] = array("name" => "Olivia", "age" => 10, "male" => false);
$_DATA['table1'][] = array("name" => "Dad", "age" => 50, "male" => true);
$_DATA['table1'][] = array("name" => "Mum", "age" => 40, "male" => false);
$_DATA['table1'][] = array("name" => "Sebastian", "age" => 56, "male" => true);
$_DATA['table1'][] = array("name" => "Lawrence", "age" => 19, "male" => true);
$_DATA['table1'][] = array("name" => "Olivia", "age" => 24, "male" => false);
$_DATA['table1'][] = array("name" => "Dad", "age" => 10, "male" => true);
$_DATA['table1'][] = array("name" => "Mum", "age" => 70, "male" => false);
###############
$res=php_multisort($_DATA['table1'], array(array('key'=>'name'),array('key'=>'age','sort'=>'desc')))
var_dump($res);
/*
array(10) {
[8]=>
array(3) {
["name"]=>
string(3) "Dad"
["age"]=>
int(10)
["male"]=>
bool(true)
}
[3]=>
array(3) {
["name"]=>
string(3) "Dad"
["age"]=>
int(50)
["male"]=>
bool(true)
}
[1]=>
array(3) {
["name"]=>
string(8) "Lawrence"
["age"]=>
int(16)
["male"]=>
bool(true)
}
[6]=>
array(3) {
["name"]=>
string(8...
*/
?>
No Spam
23-Apr-2008 11:02
23-Apr-2008 11:02
To sort the array returned e.g. by oci_fetch_all you must divide it in seperate arrays.
Example:
<?php
$rows=oci_fetch_all($stmt,$results);
?>
now you have several arrays each named by the key name in the sql result.
E.g. array of names, array of streets, array of towns.
To sort the result by e.g. towns you would do the following:
<?php
array_multisort($results[towns],$results[names],$results[streets]);
?>
Done.
To display the result sorted by towns you could use this:
<?php
print_r(array("names"=>$results[names],"streets"=>$results[streets],
"towns"=>$result[towns]));
?>
joopm at hotmail dot com
10-Apr-2008 12:50
10-Apr-2008 12:50
@ scott at bartoncomputer dot com
You could also reference the array (if you wanted the original array in the object sorted):
array_multisort($position, SORT_DESC, &$clsVar->data);
Regards, Chr.
nickl at hamiltontampa dot com
24-Feb-2008 07:02
24-Feb-2008 07:02
I believe this should read:
foreach($firstarray as $sortarray){
$column[] = $sortarray['email'];
}
//sort arrays after loop
array_multisort($column, SORT_ASC, $firstarray);
Otherwise you will get an array is inconsistent err because $column array won't equal $firstarray until the loop completes.
It was the only way I got it to work, then it was fine. If I am wrong please post a correction.
glenn at freebsd dot nl
29-Nov-2007 06:49
29-Nov-2007 06:49
To sort a nested array by column (key/index):
Example: two entries in the nested array:
firstarray[0]['adres'] = "adres1"
firstarray[0]['email'] = "email2"
firstarray[1]['adres'] = "adres2"
firstarray[1]['email'] = "email1"
-----------------------------------------
Without code: output would put adres1/email2 on top
-----------------------------------------
foreach($firstarray as $sortarray)
{
$column[] = $sortarray['email'];
array_multisort($column, SORT_ASC, $firstarray);
}
-----------------------------------------
With code: output would put adres2/email1 on top
scott at bartoncomputer dot com
03-May-2007 06:18
03-May-2007 06:18
I didn't see this noted anywhere, so I figured I'd put in a little comment regarding arrays located inside classes. For instance:
class abc
{
var $data;
}
The following code does not act as expected:
$clsVar =& new abc();
foreach ($clsVar->data as $key => $row)
{
$position[$key] = $key;
}
array_multisort($position, SORT_DESC, $clsVar->data);
While I realize this could much easily be acheived using ksort(), this is merely a much more simple example of this behaviour. The exerpt above comes from a much more complicated sort using multi-scripted arrays.
Anyway the only way I could find to get around the behaviour of multisort not sorting the referenced class-array was to make a copy of it as below:
$clsVar =& new abc();
$newData = $clsVar->data;
foreach ($newData as $key => $row)
{
$position[$key] = $key;
}
array_multisort($position, SORT_DESC, $newData);
Now newData will contain the sorted array as expected.
Hopefully this helps someone else!
10-Apr-2007 11:01
<?php
$strDeger = 'aaaa|bbbb|cccc';
$arrBol = explode('|',$strDeger);
array_multisort($arrBol, SORT_DESC);
for($i = 0; $i <= count($arrBol); $i++) {
echo $arrBol[$i].'<br />';
}
?>
vermon7
27-Feb-2007 09:23
27-Feb-2007 09:23
When using array_multisort() on copies of arrays, it is changing all the copies, even if you modify the copy before using array_multisort().
I've avoided this bug by serializing a copy of array before calling array_multisort, and unserializg it after array_multisort() Look at the code:
<?php
$records_copy = serialize($records) ;
array_multisort ( $records[$sort_field] , $records[$sort2_field] ) ;
$records_copy = unserialize($records_copy) ;
?>
Jon L. -- intel352 [AT] gmail [DOT] com
26-Feb-2007 04:27
26-Feb-2007 04:27
This is my solution for a dynamic multisort, using POST values. This doesn't account for a need to sort by multiple columns at once, but could be modified for that purpose.
<?php
/**
* @desc You really should validate the posted sort direction against a list of valid possibilities.
* Options are SORT_ASC, SORT_DESC, etc, as shown in the documentation for array_multisort
*/
$sort['direction'] = $_POST['sort_direction'] ? $_POST['sort_direction'] : 'SORT_ASC';
$sort['field'] = $_POST['sort_field'] ? $_POST['sort_field'] : 'value';
$array_to_sort = array();
$array_to_sort['TestCase1'] = array('name'=>'Test1','value'=>'218');
$array_to_sort['TestCase2'] = array('name'=>'Test2','value'=>'10');
$array_to_sort['TestCase3'] = array('name'=>'Test3','value'=>'64');
/**
* @desc Build columns using the values, for sorting in php
*/
$sort_arr = array();
foreach($array_to_sort AS $uniqid => $row){
foreach($row AS $key=>$value){
$sort_arr[$key][$uniqid] = $value;
}
}
print '<b>Before sorting</b>: <br> <pre>';
print_r($array_to_sort);
print '</pre>';
if($sort['direction']){
array_multisort($sort_arr[$sort['field']], constant($sort['direction']), $array_to_sort);
}
print '<b>After sorting</b>: <br> <pre>';
print_r($array_to_sort);
print '</pre>';
?>
This example prints out:
Before sorting:
Array
(
[TestCase1] => Array
(
[name] => Test1
[value] => 218
)
[TestCase2] => Array
(
[name] => Test2
[value] => 10
)
[TestCase3] => Array
(
[name] => Test3
[value] => 64
)
)
After sorting:
Array
(
[TestCase2] => Array
(
[name] => Test2
[value] => 10
)
[TestCase3] => Array
(
[name] => Test3
[value] => 64
)
[TestCase1] => Array
(
[name] => Test1
[value] => 218
)
)
01-Dec-2006 02:58
casting the parameter arrays for array_multisort seem to make the sorting ineffective?
for example:-
<?
foreach((array)$report_files as $report_files_i)
{
$file_stat = stat($report_files_i);
$report_files_x[] = array(
'filename' => $report_files_i
,'basename' => basename($report_files_i)
,'ctime' => date("D, M j, Y",$file_stat['ctime'])
,'size' => $file_stat['size']
);
$basename_i[] = strtolower(basename($report_files_i)); // case insensitive
}
array_multisort($basename_i, SORT_ASC, $report_files_x);
?>
The above works but if you change the last time to :-
<?
array_multisort((array)$basename_i, SORT_ASC, (array)$report_files_x);
?>
...adding the (array) cast doesn't sort the main array ...
brettz9 throu gh yah
14-Sep-2006 08:04
14-Sep-2006 08:04
Often, one may have a group of arrays which have parallel data that need to be kept associated with each other (e.g., the various attribute values of a group of elements might be stored in their own arrays). Using array_multisort as is, by specifying additional fields, it is possible, as in the documentation example cited below, that this association will be lost.
To take this example set of data from the documentation:
<?php
$ar1 = array("10", 100, 100, "a");
$ar2 = array(1, 3, "2", 1);
?>
The example goes on to sort it this way:
<?php
array_multisort($ar1, $ar2);
?>
In this case, although the "10" remains associated with the first '1' after being sorted, the "2" and '3' are reversed from their original order.
In order to sort by one field only (yet still have the other array(s) being correspondingly sorted), one can use array_keys (which makes an array out of the keys) to ensure that no further sub-sorting is performed. This works because array_keys is making an array for which no duplicates can exist (since keys will be unique), and thus, the subsequent fields will have no relevance as far as subsorting.
So, using the above data, we can perform this sort instead:
<?php
$ar3 = array_keys($ar1);
array_multisort($ar1, $ar3, $ar2);
?>
which, when $ar1 and $ar2 are dumped gives:
array(4) {
[0]=> string(2) "10"
[1]=> string(1) "a"
[2]=> int(100)
[3]=> int(100)
}
array(4) {
[0]=> int(1)
[1]=> int(1)
[2]=> int(3)
[3]=> string(1) "2"
}
ricardo
04-Sep-2006 01:47
04-Sep-2006 01:47
Hi,
Modded the function from KES,
goals:
- Object oriented
- string comparision using naturalordening
code:
<?
class HtmlTable{
var $sortorder;
var $rows;
//row adding stuf and constructor removed
function sort($sortorder){
if(is_array($sortorder)){
$this->sortorder=$sortorder;
usort($this->rows,array(&$this,'sort_compare'));
}
}
function sort_compare($a,$b){//sort function
$result=0;
foreach($this->sortorder as $key=>$value){
$result=strnatcmp($a[$key],$b[$key]);
if($result==0)continue;
if($value=='desc')$result=$result*-1;
break;
}
return $result;
}
}
?>
LPChip
28-Aug-2006 02:04
28-Aug-2006 02:04
I was looking for a way to dynamically multisort my array.
By dynamically I mean that its not static what column will be sorted and if its ASC or DESC, and the ability to have more than one sorts.
This is the way a database would allow you to do.
The best way to dynamically do this, is by using eval.
The code below is partly what I used. (eg, I left out where the arrays were made and stuff, but the important part is here.)
<?
$orderby_arr = array("col1 ASC";"col2 DESC");
// prepare multisort using eval
$eval_sort = "array_multisort(";
if ($orderby !="") {
$orderby_arr_c = count($orderby_arr);
for ($orderby_walk=0; $orderby_walk < $orderby_arr_c; $orderby_walk++) {
$pos = strpos($orderby_arr[$orderby_walk], " ");
$orderby_col = substr($orderby_arr[$orderby_walk], 0, $pos);
$orderby_type = substr($orderby_arr[$orderby_walk], $pos+1);
$eval_sort .= "\$this->OrderBy[$orderby_col]" . ", SORT_$orderby_type,";
}
}
$eval_sort .= " \$this->Current_Query);";
// if there's an array, sort it.
if ($this->Current_Query_m != -1) eval($eval_sort);
?>
RQuadling at GMail dot com
07-Aug-2006 01:53
07-Aug-2006 01:53
Extending KES's example (http://www.php.net/manual/en/function.array-multisort.php#68452) to look like array_multisort().
NOTE: Fully commented code is available at http://rquadling.php1h.com (sorry for the ads).
The syntax is the same as array_multisort().
You also have 3 additional parameters you can use:
AMC_SORT_STRING_CASELESS to sort the strings case insensitively.
AMC_LOSE_ASSOCIATION (the default behaviour) to lose the associations for the array.
AMC_KEEP_ASSOCIATION to keep the associations for the array.
Other than that, these function work together JUST like array_multisort but sorts using column(s) without the need to first extract the columns into individual arrays.
<?php
define ('AMC_SORT_STRING_CASELESS', SORT_STRING + 1);
define ('AMC_LOSE_ASSOCIATION', 1001);
define ('AMC_KEEP_ASSOCIATION', 1002);
define ('AMC_SORT_ORDER', 1003);
define ('AMC_SORT_TYPE', 1004);
function array_multisort_column(array &$a_data, $m_mixed1)
{
$a_Args = func_get_args();
$i_Args = func_num_args();
$GLOBALS['a_AMC_ordering'] = array();
$a_Columns = array_keys(reset($a_data));
$b_KeepAssociation = False;
for($i_Arg = 1 ; $i_Arg < $i_Args ; )
{
if (in_array($a_Args[$i_Arg], $a_Columns))
{
$s_Column = $a_Args[$i_Arg];
$GLOBALS['a_AMC_ordering'][$a_Args[$i_Arg]] = array
(
AMC_SORT_ORDER => SORT_ASC,
AMC_SORT_TYPE => SORT_REGULAR,
);
while
(
isset($a_Args[$i_Arg + 1]) &&
in_array
(
$a_Args[$i_Arg + 1],
array
(
AMC_KEEP_ASSOCIATION,
AMC_LOSE_ASSOCIATION,
AMC_SORT_STRING_CASELESS,
SORT_ASC,
SORT_DESC
SORT_NUMERIC,
SORT_REGULAR,
SORT_STRING,
),
True
)
)
{
if (in_array($a_Args[$i_Arg + 1], array(SORT_ASC, SORT_DESC), True))
{
$GLOBALS['a_AMC_ordering'][$s_Column][AMC_SORT_ORDER] = $a_Args[$i_Arg + 1];
}
elseif (in_array($a_Args[$i_Arg + 1], array(SORT_REGULAR, SORT_NUMERIC, SORT_STRING, AMC_SORT_STRING_CASELESS), True))
{
$GLOBALS['a_AMC_ordering'][$s_Column][AMC_SORT_TYPE] = $a_Args[$i_Arg + 1];
}
elseif (AMC_KEEP_ASSOCIATION == $a_Args[$i_Arg + 1])
{
$b_KeepAssociation = True;
}
++$i_Arg;
}
}
++$i_Arg;
}
$s_Sorter = ($b_KeepAssociation ? 'uasort' : 'usort');
$b_Result = $s_Sorter($a_data, 'array_multisort_column_cmp');
unset($GLOBALS['a_AMC_ordering']);
return $b_Result;
}
function array_multisort_column_cmp(array &$a_left, array &$a_right)
{
$i_Result = 0;
foreach($GLOBALS['a_AMC_ordering'] as $s_Column => $a_ColumnData)
{
switch ($a_ColumnData[AMC_SORT_TYPE])
{
case SORT_NUMERIC :
$i_ColumnCompareResult =
((intval($a_left[$s_Column]) == intval($a_right[$s_Column]))
?
0
:
((intval($a_left[$s_Column]) < intval($a_right[$s_Column]))
?
-1
:
1
)
);
break;
case SORT_STRING :
$i_ColumnCompareResult = strcmp((string)$a_left[$s_Column], (string)$a_right[$s_Column]);
break;
case AMC_SORT_STRING_CASELESS :
$i_ColumnCompareResult = strcasecmp((string)$a_left[$s_Column], (string)$a_right[$s_Column]);
break;
case SORT_REGULAR :
default :
$i_ColumnCompareResult =
(($a_left[$s_Column] == $a_right[$s_Column])
?
0
:
(($a_left[$s_Column] < $a_right[$s_Column])
?
-1
:
1
)
);
break;
}
if (0 == $i_ColumnCompareResult)
{
continue;
}
$i_Result = $i_ColumnCompareResult * (($a_ColumnData[AMC_SORT_ORDER] == SORT_DESC) ? -1 : 1);
break;
}
return $i_Result;
}
?>
KES http://kes.net.ua
27-Jul-2006 01:30
27-Jul-2006 01:30
<?
//sort by second column then first one
$orderBy=array('0'=>'desc', 'first'=>'asc');
function KES_cmp($a, $b) {
global $orderBy;
$result= 0;
foreach( $orderBy as $key => $value ) {
if( $a[$key] == $b[$key] ) continue;
$result= ($a[$key] < $b[$key])? -1 : 1;
if( $value=='desc' ) $result= -$result;
break;
}
return $result;
}
$result= array();
$result[]= array( 'first'=>6, 2);
$result[]= array( 'first'=>3, 2);
$result[]= array( 'first'=>1, 3);
$result[]= array( 'first'=>1, 2);
$result[]= array( 'first'=>6, 1);
print "<b>Source</b>";
print_r($result);
usort($result, 'KES_cmp');
print "<b>Result</b>";
print_r($result);
?>
KES
27-Jul-2006 12:35
27-Jul-2006 12:35
It is very handy to have function, which sort like this:
$arrayToSort[]= array(0 => ".", "type" => "dir");
$arrayToSort[]= array(0 => "qf", "type" => "file");
$arrayToSort[]= array(0 => "..", "type" => "dir");
$arrayToSort[]= array(0 => "text.txt", "type" => "file");
$arrayToSort[]= array(0 => "hello", "type" => "dir");
//first sort by the column 'type', then sort by the column '0'
$howToSort= array('type'=> 'asc', 0=> 'desc');
multisort($arrayToSort, $howToSort);
The result:
0 | type
----------------------------
. | dir
.. | dir
hello | dir
text.txt | file
qf | file
Cesar Sirvent
17-May-2006 05:43
17-May-2006 05:43
There is a problem with array_multisort in languages other than English.
For special chars, as A with accent (Á), the sorting does not correspond to what might expect from a MySQL SELECT with ORDER BY.
For example
<?php
foreach ($students as $key => $row){
$surname[$key] = $row['surname'];
}
array_multisort($surname, SORT_ASC, $students);
?>
will sort the array in this way: ABADIA, ALVAREZ, BUÑUEL, ZUBIETA, ÁLVARES
while a MySQL SELECT with ORDER BY nombre ASC will yield
ABADIA, ÁLVARES, ALVEREZ, BUÑUEL, ZUBIETA
as A and Á are considered two different representations of the same letter.
scott - evolove - net - work it out
23-Mar-2006 03:51
23-Mar-2006 03:51
A very simple way to sort an array of associative arrays by some value is to use usort.
I needed to sort an array of 20 data structures by their 'distance' value:
Array
(
[0] => Array
(
[blahblah] => blahblah
[distance] => 6
)
[1] => Array
(
you get the idea....
Here's the code:
--------------------
usort($results, "distributor_compare");
/**
* usort callback
*/
function distributor_compare($a, $b) {
$adist = intval($a['distance']);
$bdist = intval($b['distance']);
if ($adist == $bdist) {
return 0;
}
return ($adist < $bdist) ? -1 : 1;
}
--------------------
peter dot graham at tcat dot ac dot uk
16-Feb-2006 03:16
16-Feb-2006 03:16
Many thanks to AlberT at SuperAlberT dot it for his useful and elegant function. I have made some small alterations so it doesnt use pass-by-reference as this throws up warnings in newer versions of php4.
<?php
function array_key_multi_sort($arr, $l , $f='strnatcasecmp')
{
usort($arr, create_function('$a, $b', "return $f(\$a['$l'], \$b['$l']);"));
return($arr);
}
?>
mail at theopensource dot com
31-Jan-2006 07:34
31-Jan-2006 07:34
I wanted to share with you a function that I created to make the array_multisort process much easier for myself... There was some interesting things that I encountered and I will post that in the comments.
I created this function so that all I have to do is tell it what column I want to sort through in a one level deep multidimensional array. You can Try this code in your browser to view the results
ex/
<?php
//Here is an array example
$test[0]['name'] = "David";
$test[0]['age'] = 28;
$test[1]['name'] = "Dennis";
$test[1]['age'] = 23;
$test[2]['name'] = "Joseph";
$test[2]['age'] = 42;
//Here is the Function
function sortmddata($array, $by, $order, $type){
//$array: the array you want to sort
//$by: the associative array name that is one level deep
////example: name
//$order: ASC or DESC
//$type: num or str
$sortby = "sort$by"; //This sets up what you are sorting by
$firstval = current($array); //Pulls over the first array
$vals = array_keys($firstval); //Grabs the associate Arrays
foreach ($vals as $init){
$keyname = "sort$init";
$$keyname = array();
}
//This was strange because I had problems adding
//Multiple arrays into a variable variable
//I got it to work by initializing the variable variables as arrays
//Before I went any further
foreach ($array as $key => $row) {
foreach ($vals as $names){
$keyname = "sort$names";
$test = array();
$test[$key] = $row[$names];
$$keyname = array_merge($$keyname,$test);
}
}
//This will create dynamic mini arrays so that I can perform
//the array multisort with no problem
//Notice the temp array... I had to do that because I
//cannot assign additional array elements to a
//varaiable variable
if ($order == "DESC"){
if ($type == "num"){
array_multisort($$sortby,SORT_DESC, SORT_NUMERIC,$array);
} else {
array_multisort($$sortby,SORT_DESC, SORT_STRING,$array);
}
} else {
if ($type == "num"){
array_multisort($$sortby,SORT_ASC, SORT_NUMERIC,$array);
} else {
array_multisort($$sortby,SORT_ASC, SORT_STRING,$array);
}
}
//This just goed through and asks the additional arguments
//What they are doing and are doing variations of
//the multisort
return $array;
}
//Now to test it
$test = sortmddata($test,'age','ASC','num');
print_r ($test);
//This will return
//Array (
//[0] => Array ([name] => Dennis [age] => 23 )
//[1] => Array ( [name] => David [age] => 28 )
//[2] => Array ( [name] => Joseph [age] => 42 )
//)
?>
There you go... please let me know what you think if you like.
php a-t-the-r-a-t-e chir.ag
05-Jan-2006 10:10
05-Jan-2006 10:10
Re: phu at kungphu, 19-Dec-2005 11:36
asort($test) will not let me specify which columns to sort ASC/DESC, NUMERIC/STRING etc.
I have data similar to what you specified. Now I want to sort $test by points DESC and name ASC. Here's my function that does it, based on suggestions on this page. It uses array_multisort (and hence acts just like it: preserving string-keys etc.)
<?php
function arrayColumnSort()
{
$n = func_num_args();
$ar = func_get_arg($n-1);
if(!is_array($ar))
return false;
for($i = 0; $i < $n-1; $i++)
$col[$i] = func_get_arg($i);
foreach($ar as $key => $val)
foreach($col as $kkey => $vval)
if(is_string($vval))
${"subar$kkey"}[$key] = $val[$vval];
$arv = array();
foreach($col as $key => $val)
$arv[] = (is_string($val) ? ${"subar$key"} : $val);
$arv[] = $ar;
call_user_func_array("array_multisort", $arv);
return $ar;
}
$test["pete"]['points']=1;
$test["pete"]['name']='Peter';
$test["mike"]['points']=5;
$test["mike"]['name']='Mike';
$test["zoo"]['points']=2;
$test["zoo"]['name']='John Zoo';
$test["ab"]['points']=2;
$test["ab"]['name']='John Ab';
$test1 = $test;
asort($test1);
$test2 = arrayColumnSort("points", SORT_DESC, SORT_NUMERIC, "name", SORT_ASC, SORT_STRING, $test);
print_r($test1); // asort
print_r($test2); // arrayColumnSort
?>
Output from asort:
Array
(
[pete] => Array
(
[points] => 1
[name] => Peter
)
[ab] => Array
(
[points] => 2
[name] => John Ab
)
[zoo] => Array
(
[points] => 2
[name] => John Zoo
)
[mike] => Array
(
[points] => 5
[name] => Mike
)
)
Output from arrayColumnSort:
Array
(
[mike] => Array
(
[points] => 5
[name] => Mike
)
[ab] => Array
(
[points] => 2
[name] => John Ab
)
[zoo] => Array
(
[points] => 2
[name] => John Zoo
)
[pete] => Array
(
[points] => 1
[name] => Peter
)
)
phu at kungphu
19-Dec-2005 07:36
19-Dec-2005 07:36
Notepad's example using asort/arsort will -not- work unless 'points' is defined -before- 'name'.
Running the posted code sorts by 'name', which was not the point of the previous posts. Defining 'points' as 'apoints' also did not work; however, defining 'points' first yields correct sorting:
$test[0]['points']=1;
$test[0]['name']='Peter';
$test[1]['points']=5;
$test[1]['name']='Mike';
$test[2]['points']=2;
$test[2]['name']='John';
asort($test);
It appears asort uses the first defined element to sort a multidimensional array.
notepad at codewalkers dot com
10-Dec-2005 12:33
10-Dec-2005 12:33
for you guys trying to sort scores on an associative multi-dimensional array, why are you creating your own functions?