How to convert an array to a two dimensional array in PHP

Question

I'd like to convert this array:

Array
(
    [5] => 3.5
    [6] => 4.5
    [7] => 5.5

)
Array
(
    [8] => 5
    [9] => 6
    [10] => 7

)

Into a two-dimensional array that would look like this:

$array = array(
"a" => array("3.5","4.5", etc.),
"b" => array("5","6", etc.),
);

I think I'm getting close with the following code, but I'm still missing a name such as "a" and "b" for each array group:

$array = array($result);
echo '<pre>';
print_r(array_chunk($array,2, true));
echo '</pre>';

Here is the code from where I'm getting the two arrays :

$period = array(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15);
$sma = array(6,9);

foreach ($sma as $range)    {

    $sum = array_sum(array_slice($period, 0, $range));
    $result = array($range - 1 => $sum / $range);

    for ($i = $range, $n = count($period); $i != $n; ++$i) {

        $result[$i] = $result[$i - 1] + ($period[$i] - $period[$i - $range]) / $range;

    }

    $array = array($result);
    echo '<pre>';
    print_r(array_chunk($array,2, true));
    echo '</pre>';
}

$array = array("a" => $firstArray, "b" => $secondArray); Simple — RiggsFolly
– RiggsFolly, Commented Mar 22, 2018 at 15:56
Agree with @RiggsFolly, with addition of array_values() (seems to want to loose keys in final array). — Syscall
– Syscall, Commented Mar 22, 2018 at 15:58
You had better show us a print_r($result) so we know what we are dealing with here. Note- edit that into your question - DONT post as a comment — RiggsFolly
– RiggsFolly, Commented Mar 22, 2018 at 15:59

Oleksandr Khomutetsky · Accepted Answer · 2018-03-22 16:13:49Z

1

    $period = array(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15);

    $sma = array(6,9);

    $array = array();

    foreach ($sma as $range)    {

    $sum = array_sum(array_slice($period, 0, $range));

    $result = array($range - 1 => $sum / $range);

    for ($i = $range, $n = count($period); $i != $n; ++$i) {

    $result[$i] = $result[$i - 1] + ($period[$i] - $period[$i - $range]) / $range;

    }

//add each array to final array
    $array[] = $result;

    } 
    echo '<pre>';
    print_r($array);
    echo '</pre>';

edited Mar 22, 2018 at 16:13

answered Mar 22, 2018 at 16:04

Oleksandr Khomutetsky

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1 Comment

RiggsFolly Over a year ago

Good answers will always have an explanation of what was done and why it was done that way, not only for the OP but for future visitors to SO that may find this question and be reading your answer.

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