array_chunk

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

array_chunkSplittet ein Array in Teile auf

Beschreibung

array_chunk(array $array, int $length, bool $preserve_keys = false): array

array_chunk() teilt das Array in Arrays mit length Elementen auf. Das letzte Array kann weniger als length Werte enthalten.

Parameter-Liste

array

Das Eingabe-Array

length

Die Größe der einzelnen Teile

preserve_keys

Falls auf true gesetzt, bleiben die Schlüssel erhalten. Der Standard ist false, wodurch jeder Teil neue numerische Indizes erhält.

Rückgabewerte

Gibt ein mehrdimensionales Array zurück, das beginnend mit Null jeweils length Elemente enthält.

Fehler/Exceptions

Wenn length kleiner ist als 1, wird ein ValueError ausgelöst.

Changelog

Version Beschreibung
8.0.0 Wenn length kleiner ist als 1, wird nun ein ValueError ausgelöst; vorher wurde ein Fehler der Stufe E_WARNING ausgelöst, und die Funktion gab null zurück.

Beispiele

Beispiel #1 array_chunk()-Beispiel

<?php
$input_array 
= array('a''b''c''d''e');
print_r(array_chunk($input_array2));
print_r(array_chunk($input_array2true));
?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

Array
(
    [0] => Array
        (
            [0] => a
            [1] => b
        )

    [1] => Array
        (
            [0] => c
            [1] => d
        )

    [2] => Array
        (
            [0] => e
        )

)
Array
(
    [0] => Array
        (
            [0] => a
            [1] => b
        )

    [1] => Array
        (
            [2] => c
            [3] => d
        )

    [2] => Array
        (
            [4] => e
        )

)

Siehe auch

add a note add a note

User Contributed Notes 20 notes

up
68
azspot at gmail dot com
15 years ago
Tried to use an example below (#56022) for array_chunk_fixed that would "partition" or divide an array into a desired number of split lists -- a useful procedure for "chunking" up objects or text items into columns, or partitioning any type of data resource. However, there seems to be a flaw with array_chunk_fixed — for instance, try it with a nine item list and with four partitions. It results in 3 entries with 3 items, then a blank array.

So, here is the output of my own dabbling on the matter:

<?php

function partition( $list, $p ) {
   
$listlen = count( $list );
   
$partlen = floor( $listlen / $p );
   
$partrem = $listlen % $p;
   
$partition = array();
   
$mark = 0;
    for (
$px = 0; $px < $p; $px++) {
       
$incr = ($px < $partrem) ? $partlen + 1 : $partlen;
       
$partition[$px] = array_slice( $list, $mark, $incr );
       
$mark += $incr;
    }
    return
$partition;
}

$citylist = array( "Black Canyon City", "Chandler", "Flagstaff", "Gilbert", "Glendale", "Globe", "Mesa", "Miami",
                  
"Phoenix", "Peoria", "Prescott", "Scottsdale", "Sun City", "Surprise", "Tempe", "Tucson", "Wickenburg" );
print_r( partition( $citylist, 3 ) );

?>

Array
(
    [0] => Array
        (
            [0] => Black Canyon City
            [1] => Chandler
            [2] => Flagstaff
            [3] => Gilbert
            [4] => Glendale
            [5] => Globe
        )

    [1] => Array
        (
            [0] => Mesa
            [1] => Miami
            [2] => Phoenix
            [3] => Peoria
            [4] => Prescott
            [5] => Scottsdale
        )

    [2] => Array
        (
            [0] => Sun City
            [1] => Surprise
            [2] => Tempe
            [3] => Tucson
            [4] => Wickenburg
        )

)
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3
Anonymous
1 year ago
Most easy way split array to parts

<?php

$arr
= [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

print_r(array_chunk($arr, ceil(count($arr) / 2)));
// return: [[1, 2, 3, 4, 5], [6, 7, 8, 9, 10]]

print_r(array_chunk($arr, ceil(count($arr) / 3)));
// return: [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10]]

?>
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16
Andrew Martin
3 years ago
To reverse an array_chunk, use array_merge, passing the chunks as a variadic:

<?php
$array
= [1, 2, 3, 4, 5, 6, 7, 8, 9];

$chunks = array_chunk($array, 3);
// $chunks = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

$de_chunked = array_merge(…$chunks);
// $de_chunked = [1, 2, 3, 4, 5, 6, 7, 8, 9]
?>
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4
suisuiruyi at aliyun dot com
5 years ago
chunk array vertically

$arr    = range(1, 19);
function array_chunk_vertical($arr, $percolnum){
    $n = count($arr);
    $mod    = $n % $percolnum;
    $cols   = floor($n / $percolnum);
    $mod ? $cols++ : null ;
    $re     = array();
    for($col = 0; $col < $cols; $col++){
        for($row = 0; $row < $percolnum; $row++){
            if($arr){
                $re[$row][]   = array_shift($arr);
            }
        }
    }
    return $re;
}
$result = array_chunk_vertical($arr, 6);
foreach($result  as $row){
    foreach($row as $val){
        echo '['.$val.']';
    }
    echo '<br/>';
}
/*
[1][7][13][19]
[2][8][14]
[3][9][15]
[4][10][16]
[5][11][17]
[6][12][18]
*/
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20
Anonymous
16 years ago
Here my array_chunk_values( ) with values distributed by lines (columns are balanced as much as possible) :

<?php
   
function array_chunk_vertical($data, $columns) {
       
$n = count($data) ;
       
$per_column = floor($n / $columns) ;
       
$rest = $n % $columns ;

       
// The map
       
$per_columns = array( ) ;
        for (
$i = 0 ; $i < $columns ; $i++ ) {
           
$per_columns[$i] = $per_column + ($i < $rest ? 1 : 0) ;
        }

       
$tabular = array( ) ;
        foreach (
$per_columns as $rows ) {
            for (
$i = 0 ; $i < $rows ; $i++ ) {
               
$tabular[$i][ ] = array_shift($data) ;
            }
        }

        return
$tabular ;
    }

   
header('Content-Type: text/plain') ;

   
$data = array_chunk_vertical(range(1, 31), 7) ;
    foreach (
$data as $row ) {
        foreach (
$row as $value ) {
           
printf('[%2s]', $value) ;
        }
        echo
"\r\n" ;
    }

   
/*
        Output :

        [ 1][ 6][11][16][20][24][28]
        [ 2][ 7][12][17][21][25][29]
        [ 3][ 8][13][18][22][26][30]
        [ 4][ 9][14][19][23][27][31]
        [ 5][10][15]
    */
?>
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18
OIS
13 years ago
Response to azspot at gmail dot com function partition.

$columns = 3;
$citylist = array('Black Canyon City', 'Chandler', 'Flagstaff', 'Gilbert', 'Glendale', 'Globe', 'Mesa', 'Miami', 'Phoenix', 'Peoria', 'Prescott', 'Scottsdale', 'Sun City', 'Surprise', 'Tempe', 'Tucson', 'Wickenburg');
print_r(array_chunk($citylist, ceil(count($citylist) / $columns)));

Output:
Array
(
    [0] => Array
        (
            [0] => Black Canyon City
            [1] => Chandler
            [2] => Flagstaff
            [3] => Gilbert
            [4] => Glendale
            [5] => Globe
        )

    [1] => Array
        (
            [0] => Mesa
            [1] => Miami
            [2] => Phoenix
            [3] => Peoria
            [4] => Prescott
            [5] => Scottsdale
        )

    [2] => Array
        (
            [0] => Sun City
            [1] => Surprise
            [2] => Tempe
            [3] => Tucson
            [4] => Wickenburg
        )

)
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15
nate at ruggfamily dot com
11 years ago
If you just want to grab one chunk from an array, you should use array_slice().
up
2
dustin at fivetechnology dot com
6 years ago
Had need to chunk an object which implemented ArrayAccess Iterator Countable.  array_chunk wouldn't do it.  Should work for any list of things

<?php
   $listOfThings
= array(1,2,3,4,5,6,7,8,9,10,11,12,13);
  
print_r(chunk_iterable($listOfThings, 4);

  function
chunk_iterable($listOfThings, $size) {
     
$chunk = 0;
     
$chunks = array_fill(0, ceil(count($listOfThings) / $size) - 1, array());
     
$index = 0;
      foreach(
$listOfThings as $thing) {
        if (
$index && $index % $size == 0) $chunk++;
       
$chunks[$chunk][] = $thing;
       
$index++;
      }
      return
$chunks;
  }
?>
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2
siddharthundare at gmail dot com
6 years ago
<table>
<tr>
<?php

$array_chunkdata
= array(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25);
$chunk  = array_chunk($array_chunkdata,5);
$rev_counter = 2;

function
for_chunk($chunk_data){

    echo
"<td><table>";

      foreach(
$chunk_data as $key => $chunk_value)
      {
        echo
"<tr><td>";
        echo
$chunk_value;
        echo
"</td></tr>";
      }
      echo
"</table></td>";  

}

foreach(
$chunk as $key => $chunk_data)
{
    if(
$rev_counter%2==0)
    {  
     
for_chunk($chunk_data);
    }
    else
    {
     
$chunk_data array_reverse($chunk_data);
     
     
for_chunk($chunk_data);
    
    }
 
$rev_counter++;
}
?>
</tr>
</table>
/*
Output:
1
2
3
4
5
   
10
9
8
7
6
   
11
12
13
14
15
   
20
19
18
17
16
   
21
22
23
24
25
*/
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5
mick at vandermostvanspijk dot nl
18 years ago
[Editors note: This function was based on a previous function by gphemsley at nospam users dot sourceforge.net]

For those of you that need array_chunk() for PHP < 4.2.0, this function should do the trick:

<?php
if (!function_exists('array_chunk')) {
    function
array_chunk( $input, $size, $preserve_keys = false) {
        @
reset( $input );
       
       
$i = $j = 0;

        while( @list(
$key, $value ) = @each( $input ) ) {
            if( !( isset(
$chunks[$i] ) ) ) {
              
$chunks[$i] = array();
            }

            if(
count( $chunks[$i] ) < $size ) {
                if(
$preserve_keys ) {
                   
$chunks[$i][$key] = $value;
                   
$j++;
                } else {
                   
$chunks[$i][] = $value;
                }
            } else {
               
$i++;

                if(
$preserve_keys ) {
                   
$chunks[$i][$key] = $value;
                   
$j++;
                } else {
                   
$j = 0;
                   
$chunks[$i][$j] = $value;
                }
            }
        }

        return
$chunks;
    }
}
?>
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8
phpm at nreynolds dot me dot uk
17 years ago
array_chunk() is helpful when constructing tables with a known number of columns but an unknown number of values, such as a calendar month. Example:

<?php

$values
= range(1, 31);
$rows = array_chunk($values, 7);

print
"<table>\n";
foreach (
$rows as $row) {
    print
"<tr>\n";
    foreach (
$row as $value) {
        print
"<td>" . $value . "</td>\n";
    }
    print
"</tr>\n";
}
print
"</table>\n";

?>

Outputs:

1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30 31

The other direction is possible too, with the aid of a function included at the bottom of this note. Changing this line:
  $rows = array_chunk($values, 7);

To this:
  $rows = array_chunk_vertical($values, 7);

Produces a vertical calendar with seven columns:

1 6  11 16 21 26 31
2 7  12 17 22 27
3 8  13 18 23 28
4 9  14 19 24 29
5 10 15 20 25 30

You can also specify that $size refers to the number of rows, not columns:
  $rows = array_chunk_vertical($values, 7, false, false);

Producing this:

1 8  15 22 29
2 9  16 23 30
3 10 17 24 31
4 11 18 25
5 12 19 26
6 13 20 27
7 14 21 28

The function:

<?php

function array_chunk_vertical($input, $size, $preserve_keys = false, $size_is_horizontal = true)
{
   
$chunks = array();
   
    if (
$size_is_horizontal) {
       
$chunk_count = ceil(count($input) / $size);
    } else {
       
$chunk_count = $size;
    }
   
    for (
$chunk_index = 0; $chunk_index < $chunk_count; $chunk_index++) {
       
$chunks[] = array();
    }

   
$chunk_index = 0;
    foreach (
$input as $key => $value)
    {
        if (
$preserve_keys) {
           
$chunks[$chunk_index][$key] = $value;
        } else {
           
$chunks[$chunk_index][] = $value;
        }
       
        if (++
$chunk_index == $chunk_count) {
           
$chunk_index = 0;
        }
    }
   
    return
$chunks;
}

?>
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6
magick dit crow ot gmail dit com
16 years ago
This function takes each few elements of an array and averages them together. It then places the averages in a new array. It is used to smooth out data. For example lets say you have a years worth of hit data to a site and you want to graph it by the week. Then use a bucket of 7 and graph the functions output.

function array_bucket($array, $bucket_size)  // bucket filter
{
    if (!is_array($array)) return false; // no empty arrays
    $buckets=array_chunk($array,$bucket_size);  // chop up array into bucket size units
    foreach ($buckets as $bucket) $new_array[key($buckets])=array_sum($bucket)/count($bucket);
    return $new_array;  // return new smooth array
}
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4
stratboy
8 years ago
Hi, I've made  a function to split an array into chunks based on columns wanted. For example:

<?php $a = array(1,2,3,4,5,6,7,8); ?>

goal (say, for 3 columns):

<?php
array(
   array(
1,2,3),
   array(
4,5,6),
   array(
7,8)
);
?>

<?php
function get_array_columns($array, $columns){
       
       
$columns_map = array();
        for(
$i=0; $i<$columns; $i++){ $columns_map[] = 0; }//init columns
       
        //create map
       
$count = count($array);
       
$position = 0;
        while(
$count > 0){
           
$columns_map[$position]++;
           
$position = ($position < $columns-1) ? ++$position : 0;
           
$count--;
        }

       
//chunk the array based on map
       
$chunked = array();
        foreach(
$columns_map as $map){
           
$chunked[] = array_splice($array,0,$map);
        }
       
        return
$chunked;
    }
//end get_array_columns
?>
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2
normiridium at gmail dot com
6 years ago
A breakdown by groups with excess:

function array_chunk_greedy($arr, $count){
    $arr = array_chunk($arr, $count);
    if(($k = count($arr)-1) > 0){   
        if(count($arr[$k]) < $count){
            $arr[$k-1] = array_merge($arr[$k-1], $arr[$k]);
            unset($arr[$k]);
        }           
    }
    return $arr;   
}

$arr = range(1, 13);
$arr = array_chunk_greedy($arr, 4);

print_r($arr);

[1,2,3,4,5,6,7,8,9,10,11,12,13] —> [1,2,3,4] [5,6,7,8] [9,10,11,12,13]

More examples:

[1,2,3,4,5,6,7,8,9,10,11,12] —> [1,2,3,4] [5,6,7,8] [9,10,11,12]
[1,2,3,4,5,6,7,8,9,10,11,12,13] —> [1,2,3,4] [5,6,7,8] [9,10,11,12,13]
[1,2,3,4,5,6,7,8,9,10,11,12,13,14] —> [1,2,3,4] [5,6,7,8] [9,10,11,12,13,14]
[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15] —> [1,2,3,4] [5,6,7,8] [9,10,11,12,13,14,15]
[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16] —> [1,2,3,4] [5,6,7,8] [9,10,11,12] [13,14,15,16]

Example report:

$arr = range(1, 45);
$arr = array_chunk_lazy($arr, 10);

$arr = array_map(function($sub_value) {
            return implode('<br>', $sub_value);
        }, $arr);

$title = '<h2>title</h2>';
$arr = $title.implode($title, $arr).$title;

echo $arr;
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4
dead dot screamer at seznam dot cz
13 years ago
This function can be used to reverse effect of <?php array_Chunk()?>.
<?php
function array_Unchunk($array)
{
    return
call_User_Func_Array('array_Merge',$array);
}

header('Content-Type: text/plain');
$array=array(
    array(
           
'Black Canyon City',
           
'Chandler',
           
'Flagstaff',
           
'Gilbert',
           
'Glendale',
           
'Globe',
    ),
    array(
           
'Mesa',
           
'Miami',
           
'Phoenix',
           
'Peoria',
           
'Prescott',
           
'Scottsdale',
    ),
    array(
           
'Sun City',
           
'Surprise',
           
'Tempe',
           
'Tucson',
           
'Wickenburg',
    ),
);
var_Dump(array_Unchunk($array));
?>

Output:
array(17) {
  [0]=>
  string(17) "Black Canyon City"
  [1]=>
  string(8) "Chandler"
  [2]=>
  string(9) "Flagstaff"
  [3]=>
  string(7) "Gilbert"
  [4]=>
  string(8) "Glendale"
  [5]=>
  string(5) "Globe"
  [6]=>
  string(4) "Mesa"
  [7]=>
  string(5) "Miami"
  [8]=>
  string(7) "Phoenix"
  [9]=>
  string(6) "Peoria"
  [10]=>
  string(8) "Prescott"
  [11]=>
  string(10) "Scottsdale"
  [12]=>
  string(8) "Sun City"
  [13]=>
  string(8) "Surprise"
  [14]=>
  string(5) "Tempe"
  [15]=>
  string(6) "Tucson"
  [16]=>
  string(10) "Wickenburg"
}
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0
leon at valkenb dot org
1 year ago
With no luck finding a function; here is the one I wrote:
It will evenly distribute items into a fixed amount of groups but also keeps items that were sorted close together to be in the same output groups.
<?php
function distributed_array_chunk(array $items, int $groups, bool $preserveKeys = false) {

   
$grouped = [];
   
$groupsPerItem = $groups count($items);
   
$progress = 0.00;

    foreach (
$items as $key => $value) {

       
$index = floor($progress += $groupsPerItem);

        if (
$preserveKeys) {
           
$grouped[$index][$key] = $value;
        }
        else{
           
$grouped[$index][] = $value;
        }   
    }

    return
$grouped;
}
?>
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0
magick dit crow ot gmail dit com
16 years ago
Mistake key did not do what I thought. A patch.

function array_bucket($array,$bucket_size)// bucket filter
{
    if (!is_array($array)) return false;
    $buckets=array_chunk($array,$bucket_size);// chop up array into bucket size units
    $I=0;
    foreach ($buckets as $bucket)
    {
        $new_array[$I++]=array_sum($bucket)/count($bucket);
    }
    return $new_array;// return new array
}
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0
webmaster at cafe-clope dot net
16 years ago
based on the same syntax, useful about making columns :

<?php
function array_chunk_fixed($input, $num, $preserve_keys = FALSE) {
   
$count = count($input) ;
    if(
$count)
       
$input = array_chunk($input, ceil($count/$num), $preserve_keys) ;
   
$input = array_pad($input, $num, array()) ;
    return
$input ;
}

$array = array(1, 2, 3, 4, 5) ;
print_r(array_chunk($array, 2)) ;
print_r(array_chunk_fixed($array, 2)) ;
?>

---- array_chunk : fixed number of sub-items ----
Array(
    [0] => Array(
            [0] => 1
            [1] => 2
        )
    [1] => Array(
            [0] => 3
            [1] => 4
        )

    [2] => Array(
            [0] => 5
        )
)

---- array_chunk : fixed number of columns ----
Array(
    [0] => Array(
            [0] => 1
            [1] => 2
            [2] => 3
        )
    [1] => Array(
            [0] => 4
            [1] => 5
        )
)
up
-5
Anonymous
8 years ago
Couldn't get the array_chunk_values() working, so ended up with this implementation:

<?php
function array_chunk_columns($data, $num_columns) {
 
$n = count($data);
 
$per_column = floor($n / $num_columns);
 
$rest = $n % $num_columns;

 
$columns = array();
 
$index = 0;
  for (
$i = 0; $i < $num_columns; $i++) {
   
// Add an extra item to each column while the column number is less than the
    // remainder.
   
$add_rest = ($rest && ($i < $rest)) ? 1 : 0;
   
$number = $per_column + $add_rest;
   
$columns[] = array_slice($data, $index, $number);
   
$index += $number;
  }

  return
$columns;
}

?>
up
-11
Rasmus Schultz (http://mindplay.dk)
13 years ago
Unfortunately, this function only accepts real arrays, not iterable objects... For that, you need this function:

<?php

function break_array($array, $page_size) {
 
 
$arrays = array();
 
$i = 0;
 
  foreach (
$array as $index => $item) {
    if (
$i++ % $page_size == 0) {
     
$arrays[] = array();
     
$current = & $arrays[count($arrays)-1];
    }
   
$current[] = $item;
  }
 
  return
$arrays;
 
}

?>
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