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]', $value) ;
}
echo "\r\n" ;
}
/*
Output :
[ 1][ 6][11][16][20][24][28]
[ 2][ 7][12][17][21][25][29]
[ 3][ 8][13][18][22][26][30]
[ 4][ 9][14][19][23][27][31]
[ 5][10][15]
*/
?>
array_chunk
说明
array array_chunk ( array input, int size [, bool preserve_keys] )array_chunk() 将一个数组分割成多个数组，其中每个数组的单元数目由 size 决定。最后一个数组的单元数目可能会少几个。得到的数组是一个多维数组中的单元，其索引从零开始。
将可选参数 preserve_keys 设为 TRUE，可以使 PHP 保留输入数组中原来的键名。如果你指定了 FALSE，那每个结果数组将用从零开始的新数字索引。默认值是 FALSE。
add a note
User Contributed Notes
22-Mar-2006 08:19
magick dit crow ot gmail dit com
17-Oct-2005 12:50
17-Oct-2005 12:50
Mistake key did not do what I thought. A patch.
function array_bucket($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 $new_array;// return new array
}
magick dit crow ot gmail dit com
16-Oct-2005 01:58
16-Oct-2005 01:58
This function takes each few elements of an array and averages them together. It then places the averages in a new array. It is used to smooth out data. For example lets say you have a years worth of hit data to a site and you want to graph it by the week. Then use a bucket of 7 and graph the functions output.
function array_bucket($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 $new_array; // return new smooth array
}
webmaster at cafe-clope dot net
21-Aug-2005 07:27
21-Aug-2005 07:27
based on the same syntax, useful about making columns :
<?php
function array_chunk_fixed($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($array, 2)) ;
?>
---- array_chunk : fixed number of sub-items ----
Array(
[0] => Array(
[0] => 1
[1] => 2
)
[1] => Array(
[0] => 3
[1] => 4
)
[2] => Array(
[0] => 5
)
)
---- array_chunk : fixed number of columns ----
Array(
[0] => Array(
[0] => 1
[1] => 2
[2] => 3
)
[1] => Array(
[0] => 4
[1] => 5
)
)
cdblog at gmail dot com
22-May-2005 02:19
22-May-2005 02:19
<?php
/**
* @return array
* @author Cocol
* @desc use array_chunk with custom keys
* for more detail please visit http://php.clickz.cn/articles/array/array_chunk.html
*/
function array_chunk_custom($input_array = array(), $size = 0, $keys = array()) {
if (is_array($keys)) {
$values = array_values($input_array);
unset($input_array);
foreach ($keys as $key=>$val) {
$input_array[$val] = $values[$key];
}
}
$output_array = array_chunk($input_array,$size,1);
return $output_array;
}
$input_array = array('a', 'b', 'c', 'd', 'e','f','g','h');
$key_array = array('i','ii','iii','iv','v','vi','vii');
print_r(array_chunk_custom($input_array,2,$key_array));
?>
output:
Array
(
[0] => Array
(
[i] => a
[ii] => b
)
[1] => Array
(
[iii] => c
[iv] => d
)
[2] => Array
(
[v] => e
[vi] => f
)
[3] => Array
(
[vii] => g
)
)
berndt at michael - berndt dot de
23-Apr-2005 11:22
23-Apr-2005 11:22
SplitAssoziativArray() without array_chunk()
http://www.michael-berndt.de/ie/tux/assoziativen_array_zerteilen.htm
berndt at www dot michael-berndt dot de
10-Apr-2005 11:11
10-Apr-2005 11:11
split array without array_chunk()
http://www.michael-berndt.de/ie/tux/split_array.htm
phpm at nreynolds dot me dot uk
17-Dec-2004 08:21
17-Dec-2004 08:21
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;
}
?>
mick at vandermostvanspijk dot nl
07-Apr-2004 06:02
07-Apr-2004 06:02
[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;
}
}
?>