sizeof
This function will sort entity letters eg:é
I hope that help someone
function sort_entity($array) {
$total = count($array);
for ($i=0;$i<$total;$i++) {
if ($array[$i]{0} == '&') {
$array[$i] = $array[$i]{1}.$array[$i];
} else {
$array[$i] = $array[$i]{0}.$array[$i];
}
}
sort($array);
for ($i=0;$i<$total;$i++) {
$array[$i] = substr($array[$i],1);
}
return $array;
}
sort
(PHP 4, PHP 5)
sort — Sort an array
Description
bool sort
( array &$array
[, int $sort_flags
] )
This function sorts an array. Elements will be arranged from lowest to highest when this function has completed.
Parameters
- array
-
The input array.
- sort_flags
-
The optional second parameter sort_flags may be used to modify the sorting behavior using these values:
Sorting type flags:
- SORT_REGULAR - compare items normally (don't change types)
- SORT_NUMERIC - compare items numerically
- SORT_STRING - compare items as strings
- SORT_LOCALE_STRING - compare items as strings, based on the current locale. Added in PHP 4.4.0 and 5.0.2. Before PHP 6, it uses the system locale, which can be changed using setlocale(). Since PHP 6, you must use the i18n_loc_set_default() function.
Return Values
Returns TRUE on success or FALSE on failure.
ChangeLog
| Version | Description |
|---|---|
| 4.0.0 | The sort_flags parameter was added. |
Examples
Example #1 sort() example
<?php
$fruits = array("lemon", "orange", "banana", "apple");
sort($fruits);
foreach ($fruits as $key => $val) {
echo "fruits[" . $key . "] = " . $val . "\n";
}
?>
The above example will output:
fruits[0] = apple fruits[1] = banana fruits[2] = lemon fruits[3] = orange
The fruits have been sorted in alphabetical order.
Notes
Note: This function assigns new keys to the elements in array . It will remove any existing keys that may have been assigned, rather than just reordering the keys.
Note: Like most PHP sorting functions, sort() uses an implementation of » Quicksort.
Warning
Be careful when sorting arrays with mixed types values because sort() can produce unpredictable results.
add a note
User Contributed Notessort
matpatnik at hotmail dot com
23-Jan-2008 03:46
23-Jan-2008 03:46
jasons at work dot com
07-Jan-2008 12:25
07-Jan-2008 12:25
Update to the msort code posted by: alishahnovin
I had a problem with the msort function not being case sensitive. All capital letters A-Z would list in order then all lowercase letters would follow.
the line:
if ($item[$id]<$array[$lowest_id][$id]) {
was changed to:
if (strtolower($item[$id]) < strtolower($array[$lowest_id][$id])) {
<?php
function msort($array, $id="id", $sort_ascending=true) {
$temp_array = array();
while(count($array)>0) {
$lowest_id = 0;
$index=0;
foreach ($array as $item) {
if (isset($item[$id])) {
if ($array[$lowest_id][$id]) {
if (strtolower($item[$id]) < strtolower($array[$lowest_id][$id])) {
$lowest_id = $index;
}
}
}
$index++;
}
$temp_array[] = $array[$lowest_id];
$array = array_merge(array_slice($array, 0,$lowest_id), array_slice($array, $lowest_id+1));
}
if ($sort_ascending) {
return $temp_array;
} else {
return array_reverse($temp_array);
}
}
?>
david wh thomas at gm at 1l dot c0m
02-Sep-2007 06:02
02-Sep-2007 06:02
Here's a variation on the above function to sort arrays with more than one key by an arbitrary key's value.
This function allows sorting of an array of objects too
<?php
/**
* Sorts an array of objects by the value of one of the object properties or array keys
*
* @param array $array
* @param key value $id
* @param boolean $sort_ascending
* @param boolean $is_object_array
* @return array
*/
function vsort($array, $id="id", $sort_ascending=true, $is_object_array = false) {
$temp_array = array();
while(count($array)>0) {
$lowest_id = 0;
$index=0;
if($is_object_array){
foreach ($array as $item) {
if (isset($item->$id)) {
if ($array[$lowest_id]->$id) {
if ($item->$id<$array[$lowest_id]->$id) {
$lowest_id = $index;
}
}
}
$index++;
}
}else{
foreach ($array as $item) {
if (isset($item[$id])) {
if ($array[$lowest_id][$id]) {
if ($item[$id]<$array[$lowest_id][$id]) {
$lowest_id = $index;
}
}
}
$index++;
}
}
$temp_array[] = $array[$lowest_id];
$array = array_merge(array_slice($array, 0,$lowest_id), array_slice($array, $lowest_id+1));
}
if ($sort_ascending) {
return $temp_array;
} else {
return array_reverse($temp_array);
}
}
?>
Sample Usage:
<?php
$nodes = vsort($nodes,'term_data_weight', false, true);
print '<pre>'.print_r($nodes,1).'</pre>';
?>
quirk at qns dot se
22-Jul-2007 05:42
22-Jul-2007 05:42
Hi, this is my version of sorting an array by field.
From browsing previous versions it pretty much resembles bluej's version. It's way much faster than the versions where the sorting is made "manually" rather than with native php functions, and I wrote it after trying one of those that kept timing out my scripts if I had 10000 posts.
This one preserves numerical keys as well. So if you want to re-index the array after using it with numerical keys just use the array_values on the result. However there are cases where the key actually means something even if it's a number (id etc) so I didn't want to take it for granted that it should be reindexed.
Cheers
Q
<?php
function sortArrayByField
(
$original,
$field,
$descending = false
)
{
$sortArr = array();
foreach ( $original as $key => $value )
{
$sortArr[ $key ] = $value[ $field ];
}
if ( $descending )
{
arsort( $sortArr );
}
else
{
asort( $sortArr );
}
$resultArr = array();
foreach ( $sortArr as $key => $value )
{
$resultArr[ $key ] = $original[ $key ];
}
return $resultArr;
}
?>
alishahnovin at hotmail dot com
19-Jul-2007 04:16
19-Jul-2007 04:16
Someone asked me if the msort I posted below can do a sort by descending... (as it sorts by ascending...smallest to greatest).
It's a simple fix with an extra param, and then an array_reverse...but for the lazy, here you are:
<?php
function msort($array, $id="id", $sort_ascending=true) {
$temp_array = array();
while(count($array)>0) {
$lowest_id = 0;
$index=0;
foreach ($array as $item) {
if (isset($item[$id])) {
if ($array[$lowest_id][$id]) {
if ($item[$id]<$array[$lowest_id][$id]) {
$lowest_id = $index;
}
}
}
$index++;
}
$temp_array[] = $array[$lowest_id];
$array = array_merge(array_slice($array, 0,$lowest_id), array_slice($array, $lowest_id+1));
}
if ($sort_ascending) {
return $temp_array;
} else {
return array_reverse($temp_array);
}
}
?>
<?php
//oh no, this is not in the ordered by id!!
$data[] = array("item"=>"item 1", "id"=>1);
$data[] = array("item"=>"item 3", "id"=>3);
$data[] = array("item"=>"item 2", "id"=>2);
var_dump( msort($data, "id", false) ); //just msort it...greatest to smallest
var_dump( msort($data, "id") ); //just msort it...smallest to greatest
/* outputs
array
0 =>
array
'item' => 'item 3' (length=6)
'id' => 3
1 =>
array
'item' => 'item 2' (length=6)
'id' => 2
2 =>
array
'item' => 'item 1' (length=6)
'id' => 1
array
0 =>
array
'item' => 'item 1' (length=6)
'id' => 1
1 =>
array
'item' => 'item 2' (length=6)
'id' => 2
2 =>
array
'item' => 'item 3' (length=6)
'id' => 3
*/
?>
bluej100@gmail
10-Jul-2007 03:03
10-Jul-2007 03:03
The sort2d I posted before did nothing by default--that'll teach me to copy-and-paste without thinking. Its sort function has to be associative. I've changed the default to asort. natcasesort does actually work, though.
// $sort used as variable function--can be natcasesort, for example
// WARNING: $sort must be associative
function sort2d( &$arrIn, $index = null, $sort = 'asort') {
// pseudo-secure--never allow user input into $sort
if (strpos($sort, 'sort') === false) {$sort = 'asort';}
$arrTemp = Array();
$arrOut = Array();
foreach ( $arrIn as $key=>$value ) {
$arrTemp[$key] = is_null($index) ? reset($value) : $value[$index];
}
$sort($arrTemp);
foreach ( $arrTemp as $key=>$value ) {
$arrOut[$key] = $arrIn[$key];
}
$arrIn = $arrOut;
}
Also, uasort is probably actually the better solution for most 2d sorting, unless you're sorting by a dozen different indexes.
NBS Studio
04-Jul-2007 01:14
04-Jul-2007 01:14
This is my way of sorting files into date modified date order. It worked for me!
$dir='topics';
$ext='php5';
$files=scandir($dir);
foreach($files as $fs){
if(($fs!='.')&&($fs!='..')){
$fs1.='¬'.filemtime($dir.'/'.$fs).'#'.$fs;
}
}
$fs2=split('[¬]',$fs1);
arsort($fs2);
foreach($fs2 as $fs3){
if(eregi($ext,$fs3)){
$fs4.='¬'.$fs3;
}
}
$fs5=split('[#]',$fs4);
foreach($fs5 as $fs6){
if(eregi($ext,$fs6)){
$fs7.='¬'.$fs6;
}
}
$fs8=split('[¬]',$fs7);
foreach($fs8 as $fs9){
$file_list.=$fs9.'
</br>';
}
print $file_list;
sinan at sinaneldem dot com
23-Jun-2007 08:29
23-Jun-2007 08:29
here is little script which will merge arrays, remove duplicates and sort it by alphabetical order:
<?php
$array1 = array('apple', 'banana','pear');
$array2 = array('grape', 'pear','orange');
function array_unique_merge_sort($array1, $array2){
$array = array_unique(array_merge($array1, $array2));
sort($array);
foreach ($array as $key => $value) {
$new[$key] = $value;
}
return $new;
}
print_r (array_unique_merge_sort($array1, $array2));
?>
this will print out:
Array ( [0] => apple [1] => banana [2] => grape [3] => orange [4] => pear )
bluej100@gmail
07-Jun-2007 03:05
07-Jun-2007 03:05
One more solution for multidimensional sort: variable functions.
<?php
// $sort used as variable function--can be natcasesort, for example
function sort2d( &$arrIn, $index = null, $sort = 'sort') {
// pseudo-secure--never allow user input into $sort
if (strpos($sort, 'sort') === false) {$sort = 'sort';}
$arrTemp = Array();
$arrOut = Array();
foreach ( $arrIn as $key=>$value ) {
reset($value);
$arrTemp[$key] = is_null($index) ? current($value) : $value[$index];
}
$sort($arrTemp);
foreach ( $arrTemp as $key=>$value ) {
$arrOut[$key] = $arrIn[$key];
}
$arrIn = $arrOut;
}
?>
It appears to me that there are only two algorithms being proposed here (several times each):
1) copy into temp, pass temp to sort function, re-order by temp
2) implement search function in PHP
I'm curious whether anyone's implementation of (2) can beat (1) for speed. Someone have a fast PHP mergesort they can benchmark against this one? Obviously, the fact that the (1) solutions use at least two, possibly three times the memory is a drawback, but I expect that for most of us, speed is significantly more important than memory. Maybe I'll check it myself when I have a minute.
alishahnovin at hotmail dot com
28-May-2007 10:29
28-May-2007 10:29
Here's my fixed up msort array. What it does is goes through a multidimensional array, and sorts it by the desired key (defaulting to 'id').
So, for example, if you have an array like:
array[0]['value'] = "statement 2"
array[0]['id'] = "2"
array[1]['value'] = "statement 3"
array[1]['id'] = "3"
array[2]['value'] = "statement 1"
array[2]['id'] = "1"
it would rearrange and return the array to be like:
array[0]['value'] = "statement 1"
array[0]['id'] = "1"
array[1]['value'] = "statement 2"
array[1]['id'] = "2"
array[2]['value'] = "statement 3"
array[2]['id'] = "3"
The 'id' index can start at any point, and any array item missing the id index will be added to the end.
<?php
function msort($array, $id="id") {
$temp_array = array();
while(count($array)>0) {
$lowest_id = 0;
$index=0;
foreach ($array as $item) {
if (isset($item[$id]) && $array[$lowest_id][$id]) {
if ($item[$id]<$array[$lowest_id][$id]) {
$lowest_id = $index;
}
}
$index++;
}
$temp_array[] = $array[$lowest_id];
$array = array_merge(array_slice($array, 0,$lowest_id), array_slice($array, $lowest_id+1));
}
return $temp_array;
}
?>
Ex:
<?php
//oh no, this is not in the ordered by id!!
$data[] = array("item"=>"item 4");
$data[] = array("item"=>"item 1", "id"=>1);
$data[] = array("item"=>"item 3", "id"=>3);
$data[] = array("item"=>"item 2", "id"=>2);
var_dump( msort($data) ); //just msort it!
/* outputs
array
0 =>
array
'item' => 'item 1' (length=6)
'id' => 1
1 =>
array
'item' => 'item 2' (length=6)
'id' => 2
2 =>
array
'item' => 'item 3' (length=6)
'id' => 3
3 =>
array
'item' => 'item 4' (length=6)
*/
?>
alishahnovin at hotmail dot com
25-May-2007 04:11
25-May-2007 04:11
I had a multidimensional array, which needed to be sorted by one of the keys. This is what I came up with...
<?php
function msort($array, $id="id") {
$temp_array = array();
while(count($array)>0) {
$lowest_id = 0;
$index=0;
foreach ($array as $item) {
if ($item[$id]<$array[$lowest_id][$id]) {
$lowest_id = $index;
}
$index++;
}
$temp_array[] = $array[$lowest_id];
$array = array_merge(array_slice($array, 0,$lowest_id), array_slice($array, $lowest_id+1));
}
return $temp_array;
}
?>
Ex:
<?php
//oh no, this is not in the ordered by id!!
$data[] = array("item"=>"item 4", "id"=>4);
$data[] = array("item"=>"item 1", "id"=>1);
$data[] = array("item"=>"item 3", "id"=>3);
$data[] = array("item"=>"item 2", "id"=>2);
var_dump( msort($data) ); //just msort it!
/* outputs
array
0 =>
array
'item' => 'item 1' (length=6)
'id' => 1
1 =>
array
'item' => 'item 2' (length=6)
'id' => 2
2 =>
array
'item' => 'item 3' (length=6)
'id' => 3
3 =>
array
'item' => 'item 4' (length=6)
'id' => 4
*/
?>
(Qube#php@Efnet)
14-May-2007 03:38
14-May-2007 03:38
How to use an anonymous array to sort any associative array by an arbitrary key (or nested key):
$order = -1; # -1 = Ascending. Use 1 for descending.
$sortby = "['key1']['subkey']";
$mysort = create_function('$a,$b', "\$a1=\$a$sortby;\$b1=\$b$sortby; if (\$a1==\$b1) return 0; else return (\$a1<\$b1) ? $order : 0- $
order;");
uasort($assocarray, $mysort);
You can use this in a recursive function if necessary (which is why I developed it).
Matthew Hood
09-May-2007 07:27
09-May-2007 07:27
The bubble sort below will sort an array of objects based on any one of the values contained in them.
usage: objectSort($details, 'percent');
function objectSort(&$data, $key)
{
for ($i = count($data) - 1; $i >= 0; $i--)
{
$swapped = false;
for ($j = 0; $j < $i; $j++)
{
if ($data[$j]->$key > $data[$j + 1]->$key)
{
$tmp = $data[$j];
$data[$j] = $data[$j + 1];
$data[$j + 1] = $tmp;
$swapped = true;
}
}
if (!$swapped) return;
}
}
y5 at yellow5 dot us
15-Mar-2007 07:52
15-Mar-2007 07:52
An improvement on the very nice code submitted by alex [at] vkpb [dot] com. This will preserve the keys if the array is numeric:
function SortDataSet($aArray, $sField, $bDescending = false)
{
$bIsNumeric = IsNumeric($aArray);
$aKeys = array_keys($aArray);
$nSize = sizeof($aArray);
for ($nIndex = 0; $nIndex < $nSize - 1; $nIndex++)
{
$nMinIndex = $nIndex;
$objMinValue = $aArray[$aKeys[$nIndex]][$sField];
$sKey = $aKeys[$nIndex];
for ($nSortIndex = $nIndex + 1; $nSortIndex < $nSize; ++$nSortIndex)
{
if ($aArray[$aKeys[$nSortIndex]][$sField] < $objMinValue)
{
$nMinIndex = $nSortIndex;
$sKey = $aKeys[$nSortIndex];
$objMinValue = $aArray[$aKeys[$nSortIndex]][$sField];
}
}
$aKeys[$nMinIndex] = $aKeys[$nIndex];
$aKeys[$nIndex] = $sKey;
}
$aReturn = array();
for($nSortIndex = 0; $nSortIndex < $nSize; ++$nSortIndex)
{
$nIndex = $bDescending ? $nSize - $nSortIndex - 1: $nSortIndex;
$aReturn[$aKeys[$nIndex]] = $aArray[$aKeys[$nIndex]];
}
return $bIsNumeric ? array_values($aReturn) : $aReturn;
}
function IsNumeric($aArray)
{
$aKeys = array_keys($aArray);
for ($nIndex = 0; $nIndex < sizeof($aKeys); $nIndex++)
{
if (!is_int($aKeys[$nIndex]) || ($aKeys[$nIndex] != $nIndex))
{
return false;
}
}
return true;
}
joris at mangrove dot nl
01-Feb-2007 05:40
01-Feb-2007 05:40
Commenting on note http://www.php.net/manual/en/function.sort.php#62311 :
Sorting an array of objects will not always yield the results you desire.
As pointed out correctly in the note above, sort() sorts the array by value of the first member variable. However, you can not always assume the order of your member variables! You must take into account your class hierarchy!
By default, PHP places the inherited member variables on top, meaning your first member variable is NOT the first variable in your class definition!
However, if you use code analyzers or a compile cache, things can be very different. E.g., in eAccelerator, the inherited member variables are at the end, meaning you get different sort results with caching on or off.
Conclusion:
Never use sort on arrays with values of a type other than scalar or array.
alex [at] vkpb [dot] com
26-Jan-2007 03:36
26-Jan-2007 03:36
Sorting of an array by a method of inserts.
<?
function sortByField($multArray,$sortField,$desc=true){
$tmpKey='';
$ResArray=array();
$maIndex=array_keys($multArray);
$maSize=count($multArray)-1;
for($i=0; $i < $maSize ; $i++) {
$minElement=$i;
$tempMin=$multArray[$maIndex[$i]][$sortField];
$tmpKey=$maIndex[$i];
for($j=$i+1; $j <= $maSize; $j++)
if($multArray[$maIndex[$j]][$sortField] < $tempMin ) {
$minElement=$j;
$tmpKey=$maIndex[$j];
$tempMin=$multArray[$maIndex[$j]][$sortField];
}
$maIndex[$minElement]=$maIndex[$i];
$maIndex[$i]=$tmpKey;
}
if($desc)
for($j=0;$j<=$maSize;$j++)
$ResArray[$maIndex[$j]]=$multArray[$maIndex[$j]];
else
for($j=$maSize;$j>=0;$j--)
$ResArray[$maIndex[$j]]=$multArray[$maIndex[$j]];
return $ResArray;
}
// make array
$array['aaa']=array("name"=>"vasia","order"=>1);
$array['bbb']=array("name"=>"petia","order"=>2);
$array['ccc']=array("name"=>"kolia","order"=>3);
$array['ddd']=array("name"=>"zenia","order"=>4);
// set sort
$SortOrder=0; // desc by default , 1- asc
var_dump(sortByField($array,'order',$SortOrder));
array
'ddd' =>
array
'name' => 'zenia' (length=5)
'order' => 4
'aaa' =>
array
'name' => 'vasia' (length=5)
'order' => 1
'bbb' =>
array
'name' => 'petia' (length=5)
'order' => 2
'ccc' =>
array
'name' => 'kolia' (length=5)
'order' => 3
?>
crudo at pinknet dot cz
28-Nov-2006 05:54
28-Nov-2006 05:54
Simple way, how to sort an array without loosing keys:
<?php
$sizes = $bad = $good = array("d" => "dddd", "a" => "aaaa", "c" => "cccc", "e" => "eeee", "b" => "bbbb");
// original
print_r($sizes);
/*
Array
(
[d] => dddd
[a] => aaaa
[c] => cccc
[e] => eeee
[b] => bbbb
)
*/
// bad way
sort($bad);
print_r($bad);
/*
Array
(
[0] => aaaa
[1] => bbbb
[2] => cccc
[3] => dddd
[4] => eeee
)
*/
// good way
$good=array_flip($good);
ksort($good);
$good=array_flip($good);
print_r($good);
/*
Array
(
[a] => aaaa
[b] => bbbb
[c] => cccc
[d] => dddd
[e] => eeee
)
*/
?>
eran dot liberty at gmail dot com
15-Nov-2006 07:24
15-Nov-2006 07:24
/**
* Will sort an array by the value of the applied lambda function to each element
* without loosing the keys!
* @param unknown_type $arr
* @param unknown_type $func of the form mixvar func(your object)
*/
function sortByFunc(&$arr, $func) {
$tmpArr = array();
foreach ($arr as $k => &$e) {
$tmpArr[] = array('f' => $func($e), 'k' => $k, 'e' =>&$e);
}
sort($tmpArr);
$arr = array();
foreach($tmpArr as &$fke) {
$arr[$fke['k']] = &$fke['e'];
}
}
example:
$arr = array(
1 => array('name' => 'eran', 'age' => 30),
2 => array('name' => 'naama', 'age' => 29),
3 => array('name' => 'a', 'age' => 11),
4 => array('name' => 'b', 'age' => 51),
5 => array('name' => 'z', 'age' => 5),
);
foreach($arr as $key => $val) {
echo "<br> $key => (" . $val['name'] . " ," . $val['age'] . ")";
}
sortByFunc($arr,create_function('$element','return $element["age"];'));
echo "<br> now sorted:";
foreach($arr as $key => $val) {
echo "<br> $key => (" . $val['name'] . " ," . $val['age'] . ")";
}
output:
1 => (eran ,30)
2 => (naama ,29)
3 => (a ,11)
4 => (b ,51)
5 => (z ,5)
now sorted:
5 => (z ,5)
3 => (a ,11)
2 => (naama ,29)
1 => (eran ,30)
4 => (b ,51)
memzap at gmail dot com
21-Jul-2006 10:31
21-Jul-2006 10:31
Here is how you would open a file, and put each line into an array. This sorts by the first field $title field. The next thing I would like to figure out is how to do this same sort but with the ability to skip the first word of the title. Like if the title has an "a" or "the" it would skip that portion of the sort.
$currentfile = "file.txt";
$fp = fopen( $currentfile, "r" ) or die("Couldn't open $currentfile");
while ( ! feof( $fp ) ) {
$line[] = fgets( $fp, 1024 );
foreach ( $line as $newarray ) {
}
$newline[] = trim($newarray);
sort($newline);
list($title1, $titleurl1, $rating1) = split ('\|',
$newline[0]);
list($title2, $titleurl2, $rating2) = split ('\|',
$newline[1]);
list($title3, $titleurl3, $rating3) = split ('\|',
$newline[2]);
list($title4, $titleurl4, $rating4) = split ('\|',
$newline[3]);
g8z at yahoo dot com
14-Jul-2006 04:28
14-Jul-2006 04:28
<?php
/**
This sort function allows you to sort an associative array while "sticking" some fields.
$sticky_fields = an array of fields that should not be re-sorted. This is a method of achieving sub-sorts within contiguous groups of records that have common data in some fields.
For example:
$a = array();
$a []= array(
'name' => 'Sam',
'age' => 23,
'hire_date' => '2004-01-01'
);
$a []= array(
'name' => 'Sam',
'age' => 44,
'hire_date' => '2003-03-23'
);
$a []= array(
'name' => 'Jenny',
'age' => 20,
'hire_date' => '2000-12-31'
);
$a []= array(
'name' => 'Samantha',
'age' => 50,
'hire_date' => '2000-12-14'
);
$sticky_fields = array( 'name' );
print_r( stickysort( $a, 'age', DESC_NUM, $sticky_fields ) );
OUTPUT:
Array
(
[0] => Array
(
[name] => Sam
[age] => 44
[hire_date] => 2003-03-23
)
[1] => Array
(
[name] => Sam
[age] => 23
[hire_date] => 2004-01-01
)
[2] => Array
(
[name] => Jenny
[age] => 20
[hire_date] => 2000-12-31
)
[3] => Array
(
[name] => Samantha
[age] => 50
[hire_date] => 2000-12-14
)
)
Here's why this is the correct output - the "name" field is sticky, so it cannot change its sort order. Thus, the "age" field is only sorted as a sub-sort within records where "name" is identical. Thus, the "Sam" records are reversed, because 44 > 23, but Samantha remains at the bottom, even though her age is 50. This is a way of achieving "sub-sorts" and "sub-sub-sorts" (and so on) within records of identical data for specific fields.
Courtesy of the $5 Script Archive: http://www.tufat.com
**/
define( 'ASC_AZ', 1000 );
define( 'DESC_AZ', 1001 );
define( 'ASC_NUM', 1002 );
define( 'DESC_NUM', 1003 );
function stickysort( $arr, $field, $sort_type, $sticky_fields = array() ) {
$i = 0;
foreach ($arr as $value) {
$is_contiguous = true;
if(!empty($grouped_arr)) {
$last_value = end($grouped_arr[$i]);
if(!($sticky_fields == array())) {
foreach ($sticky_fields as $sticky_field) {
if ($value[$sticky_field] <> $last_value[$sticky_field]) {
$is_contiguous = false;
break;
}
}
}
}
if ($is_contiguous)
$grouped_arr[$i][] = $value;
else
$grouped_arr[++$i][] = $value;
}
$code = '';
switch($sort_type) {
case ASC_AZ:
$code .= 'return strcasecmp($a["'.$field.'"], $b["'.$field.'"]);';
break;
case DESC_AZ:
$code .= 'return (-1*strcasecmp($a["'.$field.'"], $b["'.$field.'"]));';
break;
case ASC_NUM:
$code .= 'return ($a["'.$field.'"] - $b["'.$field.'"]);';
break;
case DESC_NUM:
$code .= 'return ($b["'.$field.'"] - $a["'.$field.'"]);';
break;
}
$compare = create_function('$a, $b', $code);
foreach($grouped_arr as $grouped_arr_key=>$grouped_arr_value)
usort ( $grouped_arr[$grouped_arr_key], $compare );
$arr = array();
foreach($grouped_arr as $grouped_arr_key=>$grouped_arr_value)
foreach($grouped_arr[$grouped_arr_key] as $grouped_arr_arr_key=>$grouped_arr_arr_value)
$arr[] = $grouped_arr[$grouped_arr_key][$grouped_arr_arr_key];
return $arr;
}
?>
g8z at yahoo dot com
10-Jul-2006 08:58
10-Jul-2006 08:58
<?php
/**
This sort function allows you to sort an associative array while "sticking" some fields.
$sticky_fields = an array of fields that should not be re-sorted. This is a method of achieving sub-sorts within contiguous groups of records that have common data in some fields.
Courtesy of the $5 Script Archive: http://www.tufat.com
**/
define( 'ASC_AZ', 1000 );
define( 'DESC_AZ', 1001 );
define( 'ASC_NUM', 1002 );
define( 'DESC_NUM', 1003 );
function stickysort( $arr, $field, $sort_type, $sticky_fields = array() ) {
$i = 0;
foreach ($arr as $value) {
$is_contiguous = true;
if(!empty($grouped_arr)) {
$last_value = end($grouped_arr[$i]);
if(!($sticky_fields == array())) {
foreach ($sticky_fields as $sticky_field) {
if ($value[$sticky_field] <> $last_value[$sticky_field]) {
$is_contiguous = false;
break;
}
}
}
}
if ($is_contiguous)
$grouped_arr[$i][] = $value;
else
$grouped_arr[++$i][] = $value;
}
$code = '';
switch($sort_type) {
case ASC_AZ:
$code .= 'return strcasecmp($a["'.$field.'"], $b["'.$field.'"]);';
break;
case DESC_AZ:
$code .= 'return (-1*strcasecmp($a["'.$field.'"], $b["'.$field.'"]));';
break;
case ASC_NUM:
$code .= 'return ($a["'.$field.'"] - $b["'.$field.'"]);';
break;
case DESC_NUM:
$code .= 'return ($b["'.$field.'"] - $a["'.$field.'"]);';
break;
}
$compare = create_function('$a, $b', $code);
foreach($grouped_arr as $grouped_arr_key=>$grouped_arr_value)
usort ( $grouped_arr[$grouped_arr_key], $compare );
$arr = array();
foreach($grouped_arr as $grouped_arr_key=>$grouped_arr_value)
foreach($grouped_arr[$grouped_arr_key] as $grouped_arr_arr_key=>$grouped_arr_arr_value)
$arr[] = $grouped_arr[$grouped_arr_key][$grouped_arr_arr_key];
return $arr;
}
?>
g8z at yahoo dot com
10-Jul-2006 08:57
10-Jul-2006 08:57
<?php
/**
This sort function allows you to sort an associative array while "sticking" some fields.
$sticky_fields = an array of fields that should not be re-sorted. This is a method of achieving sub-sorts within contiguous groups of records that have common data in some fields.
Courtesy of the $5 Script Archive: http://www.tufat.com
**/
define( 'ASC_AZ', 1000 );
define( 'DESC_AZ', 1001 );
define( 'ASC_NUM', 1002 );
define( 'DESC_NUM', 1003 );
function stickysort( $arr, $field, $sort_type, $sticky_fields = array() ) {
$i = 0;
foreach ($arr as $value) {
$is_contiguous = true;
if(!empty($grouped_arr)) {
$last_value = end($grouped_arr[$i]);
if(!($sticky_fields == array())) {
foreach ($sticky_fields as $sticky_field) {
if ($value[$sticky_field] <> $last_value[$sticky_field]) {
$is_contiguous = false;
break;
}
}
}
}
if ($is_contiguous)
$grouped_arr[$i][] = $value;
else
$grouped_arr[++$i][] = $value;
}
$code = '';
switch($sort_type) {
case ASC_AZ:
$code .= 'return strcasecmp($a["'.$field.'"], $b["'.$field.'"]);';
break;
case DESC_AZ:
$code .= 'return (-1*strcasecmp($a["'.$field.'"], $b["'.$field.'"]));';
break;
case ASC_NUM:
$code .= 'return ($a["'.$field.'"] - $b["'.$field.'"]);';
break;
case DESC_NUM:
$code .= 'return ($b["'.$field.'"] - $a["'.$field.'"]);';
break;
}
$compare = create_function('$a, $b', $code);
foreach($grouped_arr as $grouped_arr_key=>$grouped_arr_value)
usort ( $grouped_arr[$grouped_arr_key], $compare );
$arr = array();
foreach($grouped_arr as $grouped_arr_key=>$grouped_arr_value)
foreach($grouped_arr[$grouped_arr_key] as $grouped_arr_arr_key=>$grouped_arr_arr_value)
$arr[] = $grouped_arr[$grouped_arr_key][$grouped_arr_arr_key];
return $arr;
}
?>
Emiliyan at ServicesBG dot Com
28-Mar-2006 07:41
28-Mar-2006 07:41
#This is a function that will sort an array...
function sort_by($array, $keyname = null, $sortby) {
$myarray = $inarray = array();
# First store the keyvalues in a seperate array
foreach ($array as $i => $befree) {
$myarray[$i] = $array[$i][$keyname];
}
# Sort the new array by
switch ($sortby) {
case 'asc':
# Sort an array and maintain index association...
asort($myarray);
break;
case 'arsort':
# Sort an array in reverse order and maintain index association
arsort($myarray);
break;
case 'natcasesor':
# Sort an array using a case insensitive "natural order" algorithm
natcasesort($myarray);
break;
}
# Rebuild the old array
foreach ( $myarray as $key=> $befree) {
$inarray[$key] = $array[$key];
}
return $inarray;
}
sort_by(); example...
$info = sort_by($myarray, 'name', $use = 'asc');
print_r($info);
ludvig dot ericson at gmail dot com
25-Feb-2006 09:48
25-Feb-2006 09:48
A tip for those who like "raul at jimi dot com dot mx" need to preserve keys after changing stuff in the middle of an array:
array_values.
Example:
<?php
$array = array(1, 2, 5, 9, 3);
unset($array[3]); // Remove index 3, which is 9.
$array = array_values($array);
?>
Hint: array_values can be fine for removing keys and reindex them by number instead, too (applies to functions like posix_pwgetuid which returns an associative array, unlike C and others, call array_values on it, and it'll be the same format IIRC.)
jesper at snt dot utwente dot nl
24-Feb-2006 01:26
24-Feb-2006 01:26
If you sort an array of objects, the first variable in the object will be used for sorting:
<?php
class foo
{
var $value; //First variable: Used for sorting
var $id;
function foo($i, $v)
{
$this->id = $i;
$this->value = $v;
}
}
for ($i = 0; $i < 10; $i++)
{
$bar[] = new foo($i,rand(1,10));
}
// This will sort on value
sort($bar);
print_r($bar);
?>
Compare the piece of code above with the following:
<?php
class foo
{
var $id; //First variable: Used for sorting
var $value;
function foo($i, $v)
{
$this->id = $i;
$this->value = $v;
}
}
for ($i = 0; $i = 10; $i++)
{
$bar[] = new foo($i,rand(1,10));
}
// This will sort on id
sort($bar);
print_r($bar);
?>
As you can see the location of declaration of the variables matter!
If you want to sort on both or on a combination of variables, use ksort()
jerome a-t+ yamafoto d*o*t com