How to eqally split an array to 3 arrays

Question

I have a one dimensional array as follows. (It may dynamically extend to any length)

Array
(
[0] => Array
    (
        [city] => Trivandrum
        [citykey] => ab5416c6
    )

[1] => Array
    (
        [city] => Kochi
        [citykey] => 85cb7d9c
    )

[2] => Array
    (
        [city] => Alappuzha
        [citykey] => 4d5f200e
    )

[3] => Array
    (
        [city] => Mumbai
        [citykey] => 47d98024
    )

)

Now I would like to split it to 3 arrays . I mean I would like to split an array in to 3 arrays as follows.

    Array
(
[0] => Array
    (
        [city] => Trivandrum
        [citykey] => ab5416c6
    )
[1] => Array
    (
        [city] => Mumbai
        [citykey] => 47d98024
    )

)

Array
(
[0] => Array
    (
        [city] => Kochi
        [citykey] => 85cb7d9c
    )

)

Array
(
[0] => Array
    (
        [city] => Alappuzha
        [citykey] => 4d5f200e
    )

)

Depending on how you want it split into 3 different arrays, array_chunk() may be helpful. — drew010
– drew010, Commented Apr 28, 2012 at 17:14
What do you want each array to contain? It's not clear from the question. Could you provide the expected output from this four element array? — James C
– James C, Commented Apr 28, 2012 at 17:15
I would like to get this output. Array ( [0] => Array ( [city] => Trivandrum [citykey] => ab5416c6 ) [1] => Array ( [city] => Mumbai [citykey] => 47d98024 ) ) Array ( [0] => Array ( [city] => Kochi [citykey] => 85cb7d9c ) ) Array ( [0] => Array ( [city] => Alappuzha [citykey] => 4d5f200e ) ) — Sunil
– Sunil, Commented Apr 28, 2012 at 17:19
Why do you want to create 3 independent array variables? Why can't they be a part of a parent array, like they are now. If you really want to create 3 different arrays, what names are you going to given them? — Nadh
– Nadh, Commented Apr 28, 2012 at 17:25
I just trying to split an array in to three. If the parent array contains 5 elements , then 1st,4th will go to the first array , 2nd and 5th will go to the second array and 3rd will go to the third array. Please help me — Sunil
– Sunil, Commented Apr 28, 2012 at 17:32

James C · Accepted Answer · 2012-04-28 17:43:58Z

1

$a = range(1,4); // example input array of 4 items
$n = 3; // number of pieces you want in the output array $b

$b = array_fill(0, $n, array());
for($i=0; $i<count($a); $i++) {
    $b[$i % $n][] = $a[$i];
}

print_r($b);

// if you need to split them out
list($a1,$a2,$a3) = $b;

edited Apr 28, 2012 at 17:43

answered Apr 28, 2012 at 17:14

James C

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Comments

Juraj.Lorinc · Accepted Answer · 2012-04-28 17:39:41Z

0

Try this code:

<?
$i=0;
$array=Array(0=> Array("city" => 'Trivandrum',
        "citykey" => 'ab5416c6'
    ),
1 => Array
    (
        "city" => 'Kochi',
        "citykey" => '85cb7d9c'
    ),
2 => Array
    (
        "city" => 'Alappuzha',
        "citykey" => '4d5f200e'
    ),
3 => Array
    (
        "city" => 'Mumbai',
        "citykey" => '47d98024'
    )
);
$array_0=array();
$array_1=array();
$array_2=array();
foreach ($array as $value)
  {
  $name='array_'.$i%3;
  $temp[0]=$value;
  $$name=array_merge_recursive($$name, $temp);
  $i++;
  }
echo '<pre>';
print_r($array_0);
print_r($array_1);
print_r($array_2);
echo '</pre>';
?>

Your original array should be in variable $array

answered Apr 28, 2012 at 17:39

Juraj.Lorinc

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