CODEWITHSUNDEEP
phparraysmultidimensional-array
Dan
Dan

Reputation: 1244

How to rekey numerical array keys

I have an array $matrix_part, containing arrays, and I want to rekey the inner keys to start at 1.

I am trying to code below but it doesn't work - it just stores the new array identically.

$temp_matrix = array();
foreach ($matrix_part as $k => $v){
$temp_matrix[$k++] = $v;
}
$matrix_part = $temp_matrix;

Source array:

Array
(
    [0] => Array
        (
            [0] => 163
            [1] => 23
            [2] => 97
        )
    [1] => Array
        (
            [0] => 163
            [1] => 23
            [2] => 97
        )
    [2] => Array
        (
            [0] => 163
            [1] => 23
            [2] => 97
        )
)

Desired output:

Array
(
    [0] => Array
        (
            [1] => 163
            [2] => 23
            [3] => 97
        )
    [1] => Array
        (
            [1] => 163
            [2] => 23
            [3] => 97
        )
    [2] => Array
        (
            [1] => 163
            [1] => 23
            [3] => 97
        )
)

Upvotes: 1

Views: 1456

Answers (4)

Borislav
Borislav

Reputation: 144

foreach ($a as $outer_k => $outer_v) {
    for ($i = count($outer_v) - 1; $i >= 0; $i--) {
        $outer_v[$i+1] = $outer_v[$i];
    }
    unset($outer_v[0]);
    $a[$outer_k] = $outer_v;
}

where $a is your input array

Upvotes: 1

Yoshi
Yoshi

Reputation: 54659

This maybe?

$input = array(
    array(163, 23, 97),
    array(163, 23, 97),
    array(163, 23, 97),
);

$output = array_map(function ($innerArray) {
    return array_combine(range(1, sizeof($innerArray)), $innerArray);
}, $input);

print_r($output);

Upvotes: 2

designosis
designosis

Reputation: 5263

Could do something like ...

    foreach ($matrix as $k=>$v) {
        foreach ($v as $k2=>$v2) {
            $tmp_arr[$k][$k2+1] = $v2;
        }
    }
    $matrix = $tmp_arr;

Upvotes: 1

The Mask
The Mask

Reputation: 17447

Try use: instead of this:

  $temp_matrix[$k++] = $v;

do this:

 $temp_matrix[++$k] = $v;

Upvotes: 2

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