Combine arrays to form a multidimensional array

Question

I have three arrays:

$arr1 = Array (
    [0] => 1001
    [1] => 1007
    [2] => 1006);

$arr2 = Array (
    [0] => frank
    [1] => youi
    [2] => nashua);

$arr3 = Array (
    [0] => getfrankemail
    [1] => getyouiemail
    [2] => getnashuaemail);

Is there a way to combine these arrays to get a multidimensional array like this:?

Array (
        [0] => Array (
            [0] => 1001
            [1] => frank
            [2] => getfrankemail)
        [1] => Array (
            [0] => 1007
            [1] => youi
            [2] => getyouiemail)
        [2] => Array (
            [0] => 1006
            [1] => nashua
            [2] => getnashuaemail)
        );

Pete Mitchell · Accepted Answer · 2013-11-15 15:47:27Z

3

edit: what you are really looking for is a php version of the zip method in ruby/python.

For your specific example array_map works nicely:

$result = array_map(null, $arr1, $arr2, $arr3);

Output:

array (
  0 =>
  array (
    0 => 1001,
    1 => 'frank',
    2 => 'frankemail',
  ),
  1 =>
  array (
    0 => 1007,
    1 => 'youi',
    2 => 'youiemail',
  ),
  2 =>
  array (
    0 => 1006,
    1 => 'nashua',
    2 => 'nashuaemail',
  ),
)

Iterate on the first array (looks like those are ids), and you can match the key for each value to indexes in $arr2 and $arr3

$result = array();

foreach ($arr1 as $key => $value) {
    $result[] = array($value, $arr2[$key], $arr3[$key]);
}

as @kingkero mentions in his answer, you will get errors if they keys do not exist, which you could check for and ignore any rows where that is the case.

$result = array();

foreach ($arr1 as $key => $value) {
    if (!isset($arr2[$key]) || !isset($arr3[$key])) {
        continue;
    }

    $result[] = array($value, $arr2[$key], $arr3[$key]);
}

edited Nov 15, 2013 at 15:47

answered Nov 15, 2013 at 15:32

Pete Mitchell

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3 Comments

kero Over a year ago

This would get OP [ [1001,1007,1006], [frank, youi, nashua], [frankemail, youiemail, nashuaemail] ] which is not the wanted result

Pete Mitchell Over a year ago

@kingkero I have edited my answer with a slightly different approach ;)

maikelsabido Over a year ago

@PeteMitchell Wow this solution is perfect. It solved my problem. Thanks! :)

ilpaijin · Accepted Answer · 2013-11-15 15:33:04Z

1

You could use array_push($aContainer, $arr1); or $aContainer[] = $arr[1]

answered Nov 15, 2013 at 15:33

ilpaijin

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Comments

kero · Accepted Answer · 2013-11-15 15:35:03Z

0

You can do this with a loop in which you access each of the three arrays with the same key.

$result = array();
$max = count($arr1);
for ($i=0; $i<$max; $i++) {
    $result[] = array(
        $arr1[$i],
        $arr2[$i],
        $arr3[$i],
    );
}

This could fire an out of bounds exception, since it doesn't check whether or not $arrX[$i] exists. Can you be sure that it does?

edited Nov 15, 2013 at 15:35

answered Nov 15, 2013 at 15:24

kero

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