Your function PHPMultiSort works well, your return var is $results instead of $result, should change. Good work.
array_multisort
(PHP 4, PHP 5)
array_multisort — 对多个数组或多维数组进行排序
说明
如果成功则返回 TRUE,失败则返回 FALSE。
array_multisort() 可以用来一次对多个数组进行排序,或者根据某一维或多维对多维数组进行排序。
关联(string)键名保持不变,但数字键名会被重新索引。
输入数组被当成一个表的列并以行来排序――这类似于 SQL 的 ORDER BY 子句的功能。第一个数组是要排序的主要数组。数组中的行(值)比较为相同的话就按照下一个输入数组中相应值的大小来排序,依此类推。
本函数的参数结构有些不同寻常,但是非常灵活。第一个参数必须是一个数组。接下来的每个参数可以是数组或者是下面列出的排序标志。
排序顺序标志:
- SORT_ASC - 按照上升顺序排序
- SORT_DESC - 按照下降顺序排序
排序类型标志:
- SORT_REGULAR - 将项目按照通常方法比较
- SORT_NUMERIC - 将项目按照数值比较
- SORT_STRING - 将项目按照字符串比较
每个数组之后不能指定两个同类的排序标志。每个数组后指定的排序标志仅对该数组有效 - 在此之前为默认值 SORT_ASC 和 SORT_REGULAR。
Example#1 对多个数组排序
<?php
$ar1 = array("10", 100, 100, "a");
$ar2 = array(1, 3, "2", 1);
array_multisort($ar1, $ar2);
var_dump($ar1);
var_dump($ar2);
?>
本例中经过排序后,第一个数组将包含 "10","a",100,100。第二个数组将包含 1,1,"2",3。第二个数组中的项目顺序完全和第一个数组中相应的项目(100 和 100)顺序一致。
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]=> string(1) "2" [3]=> int(3) }
Example#2 对多维数组排序
<?php
$ar = array (array ("10", 100, 100, "a"), array (1, 3, "2", 1));
array_multisort ($ar[0], SORT_ASC, SORT_STRING,
$ar[1], SORT_NUMERIC, SORT_DESC);
?>
本例中经过排序后,第一个数组将包含 10,100,100,"a"(作为字符串上升排序),第二个数组将包含 1,3,"2",1(作为数值下降排序)。
Example#3 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);
?>
本例中在排序后,第一个数组将变成 "10",100,100,11,"a"(被当作字符串以升序排列)。第二个数组将包含 1, 3, "2", 2, 1(被当作数字以降序排列)。
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#4 对数据库结果进行排序
本例中 data 数组中的每个单元表示一个表中的一行。这是典型的数据库记录的数据集合。
例子中的数据如下:
volume | edition -------+-------- 67 | 2 86 | 1 85 | 6 98 | 2 86 | 6 67 | 7
数据全都存放在名为 data 的数组中。这通常是通过循环从数据库取得的结果,例如 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);
$data[] = array('volume' => 67, 'edition' => 7);
?>
本例中将把 volume 降序排列,把 edition 升序排列。
现在有了包含有行的数组,但是 array_multisort() 需要一个包含列的数组,因此用以下代码来取得列,然后排序。
<?php
// 取得列的列表
foreach ($data as $key => $row) {
$volume[$key] = $row['volume'];
$edition[$key] = $row['edition'];
}
// 将数据根据 volume 降序排列,根据 edition 升序排列
// 把 $data 作为最后一个参数,以通用键排序
array_multisort($volume, SORT_DESC, $edition, SORT_ASC, $data);
?>
数据集合现在排好序了,结果如下:
volume | edition -------+-------- 98 | 2 86 | 1 86 | 6 85 | 6 67 | 2 67 | 7
Example#5 不区分大小写字母排序
SORT_STRING 和 SORT_REGULAR 都是区分大小写字母的,大写字母会排在小写字母之前。
要进行不区分大小写的排序,就要按照原数组的小写字母拷贝来排序。
<?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);
?>
上例将输出:
Array ( [0] => Alpha [1] => atomic [2] => bank [3] => Beta )
【译者注】本函数相当有用,为有助于理解,请再看下面这个例子:
Example#6 名次排列
<?php
$grade = array("score" => array(70, 95, 70.0, 60, "70"),
"name" => array("Zhang San", "Li Si", "Wang Wu",
"Zhao Liu", "Liu Qi"));
array_multisort($grade["score"], SORT_NUMERIC, SORT_DESC,
// 将分数作为数值,由高到低排序
$grade["name"], SORT_STRING, SORT_ASC);
// 将名字作为字符串,由小到大排序
var_dump($grade);
?>
上例将输出:
array(2) { ["score"]=> array(5) { [0]=> int(95) [1]=> string(2) "70" [2]=> float(70) [3]=> int(70) [4]=> int(60) } ["name"]=> array(5) { [0]=> string(5) "Li Si" [1]=> string(6) "Liu Qi" [2]=> string(7) "Wang Wu" [3]=> string(9) "Zhang San" [4]=> string(8) "Zhao Liu" } }
本例中对包含成绩的数组 $grade 按照分数(score)由高到低进行排序,分数相同的人则按照名字(name)由小到大排序。排序后李四 95 分为第一名,赵六 60 分为第五名没有异议。张三、王五和刘七都是 70 分,他们的名次则由其姓名的字母顺序排列,Liu 在前,Wang 在后而 Zhang 在最后。为了区别,三个 70 分分别用了整数,浮点数和字符串来表示,可以在程序输出中清楚地看到它们排序的结果。
array_multisort
16-May-2008 02:12
11-May-2008 05:16
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 $results;
}
###############
// 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...
*/
?>
29-Apr-2008 03:48
this function would actually be very usefull if alphanumeric sorting was possible..
23-Apr-2008 06:02
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"=>$result[towns]));
?>
10-Apr-2008 07:50
@ scott at bartoncomputer dot com
You could also reference the array (if you wanted the original array in the object sorted):
array_multisort($position, SORT_DESC, &$clsVar->data);
Regards, Chr.
25-Feb-2008 03:02
I believe this should read:
foreach($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 $firstarray until the loop completes.
It was the only way I got it to work, then it was fine. If I am wrong please post a correction.
30-Nov-2007 02:49
To sort a nested array by column (key/index):
Example: two entries in the nested array:
firstarray[0]['adres'] = "adres1"
firstarray[0]['email'] = "email2"
firstarray[1]['adres'] = "adres2"
firstarray[1]['email'] = "email1"
-----------------------------------------
Without code: output would put adres1/email2 on top
-----------------------------------------
foreach($firstarray as $sortarray)
{
$column[] = $sortarray['email'];
array_multisort($column, SORT_ASC, $firstarray);
}
-----------------------------------------
With code: output would put adres2/email1 on top
04-May-2007 01:18
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!
<?php
$strDeger = 'aaaa|bbbb|cccc';
$arrBol = explode('|',$strDeger);
array_multisort($arrBol, SORT_DESC);
for($i = 0; $i <= count($arrBol); $i++) {
echo $arrBol[$i].'<br />';
}
?>
28-Feb-2007 05:23
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) ;
?>
27-Feb-2007 12:27
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
)
)
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 ...
14-Sep-2006 03:04
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"
}
04-Sep-2006 08:47
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;
}
}
?>
28-Aug-2006 09:04
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($eval_sort);
?>
07-Aug-2006 08:53
Extending KES's example (http://www.php.net/manual/en/function.array-multisort.php#68452) to look like array_multisort().
NOTE: Fully commented code is available at http://rquadling.php1h.com (sorry for the ads).
The syntax is the same as array_multisort().
You also have 3 additional parameters you can use:
AMC_SORT_STRING_CASELESS to sort the strings case insensitively.
AMC_LOSE_ASSOCIATION (the default behaviour) to lose the associations for the array.
AMC_KEEP_ASSOCIATION to keep the associations for the array.
Other than that, these function work together JUST like array_multisort but sorts using column(s) without the need to first extract the columns into individual arrays.
<?php
define ('AMC_SORT_STRING_CASELESS', SORT_STRING + 1);
define ('AMC_LOSE_ASSOCIATION', 1001);
define ('AMC_KEEP_ASSOCIATION', 1002);
define ('AMC_SORT_ORDER', 1003);
define ('AMC_SORT_TYPE', 1004);
function array_multisort_column(array &$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;
}
?>
27-Jul-2006 08:30
<?
//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);
?>
27-Jul-2006 07:35
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, $howToSort);
The result:
0 | type
----------------------------
. | dir
.. | dir
hello | dir
text.txt | file
qf | file
18-May-2006 12:43
There is a problem with array_multisort in languages other than English.
For special chars, as A with accent (Á), the sorting does not correspond to what might expect from a MySQL SELECT with ORDER BY.
For example
<?php
foreach ($students as $key => $row){
$surname[$key] = $row['surname'];
}
array_multisort($surname, SORT_ASC, $students);
?>
will sort the array in this way: ABADIA, ALVAREZ, BUÑUEL, ZUBIETA, ÁLVARES
while a MySQL SELECT with ORDER BY nombre ASC will yield
ABADIA, ÁLVARES, ALVEREZ, BUÑUEL, ZUBIETA
as A and Á are considered two different representations of the same letter.
23-Mar-2006 11:51
A very simple way to sort an array of associative arrays by some value is to use usort.
I needed to sort an array of 20 data structures by their 'distance' value:
Array
(
[0] => Array
(
[blahblah] => blahblah
[distance] => 6
)
[1] => Array
(
you get the idea....
Here's the code:
--------------------
usort($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 < $bdist) ? -1 : 1;
}
--------------------
16-Feb-2006 11:16
Many thanks to AlberT at SuperAlberT dot it for his useful and elegant function. I have made some small alterations so it doesnt use pass-by-reference as this throws up warnings in newer versions of php4.
<?php
function array_key_multi_sort($arr, $l , $f='strnatcasecmp')
{
usort($arr, create_function('$a, $b', "return $f(\$a['$l'], \$b['$l']);"));
return($arr);
}
?>
01-Feb-2006 03:34
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 ($test);
//This will return
//Array (
//[0] => Array ([name] => Dennis [age] => 23 )
//[1] => Array ( [name] => David [age] => 28 )
//[2] => Array ( [name] => Joseph [age] => 42 )
//)
?>
There you go... please let me know what you think if you like.
06-Jan-2006 06:10
Re: phu at kungphu, 19-Dec-2005 11:36
asort($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
)
)
20-Dec-2005 03:36
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.
10-Dec-2005 08:33
for you guys trying to sort scores on an associative multi-dimensional array, why are you creating your own functions?
<?php
$test[0]['name']='Peter';
$test[0]['points']=1;
$test[1]['name']='Mike';
$test[1]['points']=5;
$test[2]['name']='John';
$test[2]['points']=2;
asort($test);
// or even arsort();
?>
the above seems to work for me...
30-Sep-2005 09:46
RWCs code works very well until you get a point value greater then ten. This is because the strcmp() function will return that 2 > 10 and 2 > 11 2 > 19 and so on. To compare number values over ten try a sort like this:
$test = multi_sort($test, $key = 'points');
function multi_sort($array, $akey)
{
function compare($a, $b)
{
global $key;
if ($a[$key]>$b[$key]){
$varcmp = "1";
return $varcmp;
}
elseif ($a[$key]<$b[$key]){
$varcmp = "-1";
return $varcmp;
}
elseif ($a[$key]==$b[$key]){
$varcmp = "0";
return $varcmp;
}
}
usort($array, "compare");
return $array;
}
26-Sep-2005 04:45
This is the simpler version of the function by AlberT.
A lot of times you have got an array like this:
$test[0]['name']='Peter';
$test[0]['points']=1;
$test[1]['name']='Mike';
$test[1]['points']=5;
$test[2]['name']='John';
$test[2]['points']=2;
You just want to sort on the index in the second dimension, ie. on points in the above example.
You can use the function below and call it like this:
$test = multi_sort($test, $key = 'points');
function multi_sort($array, $akey)
{
function compare($a, $b)
{
global $key;
return strcmp($a[$key], $b[$key]);
}
usort($array, "compare");
return $array;
}
Note: to be able to use $key in the compare function, it can not simply be passed as a parameter. It has to be declared global and set somewhere outside of compare().
18-Jul-2005 09:59
a nice piece of code to do an "array_key_multi_sort()" is the following:
<?php
/**
* orders a multidimentional array on the base of a label-key
*
* @param $arr, the array to be ordered
* @param $l the "label" identifing the field
* @param $f the ordering function to be used,
* strnatcasecmp() by default
* @return TRUE on success, FALSE on failure.
*/
function array_key_multi_sort(&$arr, $l , $f='strnatcasecmp') {
return usort($arr, create_function('$a, $b', "return $f(\$a['$l'], \$b['$l']);"));
}
?>
13-Jun-2005 02:48
If your data is in an associative array that you would need to separate into columns such as those retrieved with your favorite flavor of _fetch_array() in order to be able to use multisort(), you should consider using uasort() or usort() as an alternative. Here is an example of how this could be beneficial:
(key is employee number which remains intact; rows are sorted by surname, firstname)
<?php
function namecmp( $row1,$row2 )
{
$first = strcmp($row1['surname'], $row2['surname']) ;
if ( $first )
return $first ;
else
return strcmp($row1['name'], $row2['name']) ;
}
$test = array( '11122202' => array('empno'=>11122202,'name'=>'geezer'
,'surname'=>'schmidt','age'=>96,'sex'=>'male')
,'11122204' => array('empno'=>11122204,'name'=>'coed'
,'surname'=>'beaujolais','age'=>18,'sex'=>'female')
,'11122206' => array('empno'=>11122206,'name'=>'immortal'
,'surname'=>'ramos','age'=>21,'sex'=>'male')
,'11122208' => array('empno'=>11122208,'name'=>'babyface'
,'surname'=>'brown','age'=>1,'sex'=>'male')
,'11122210' => array('empno'=>11122210,'name'=>'exjock'
,'surname'=>'gatti','age'=>48,'sex'=>'male')
,'11122212' => array('empno'=>11122212,'name'=>'jailbait'
,'surname'=>'muhammed','age'=>15,'sex'=>'female') )
;
echo "<pre>" ;
print_r( $test ) ;
uasort(