Construct multidimensional array with array_push

Question

Looking to construct below multidimensional array. The first level-1 is ok, but the second is set to same level-1.

Question:

How can I direct the second foreach-loop to build the level-2, right under level-1 ?

Wanted result:

Array
(
    [id_no_1] => Array
        (
            [0] => title_1
        )

    [id_no_2] => Array
        (
            [0] => title_2
        )

)

My attempt:

<?php

// Position [Level-1]
$taxonomy_id = [
  "id_no_1",
  "id_no_2",
];

// Position [Level-2]
$titles = [
  "title_1",
  "title_2",
];

$array = [];

// Populate [level-1]
foreach ($taxonomy_id as $key => $value) {
  array_push($array, $taxonomy_id["{$key}"]);
}

// Populate [level-2]
foreach ($titles as $key => $value) {
  array_push($array, $titles["{$key}"]);
}


print_r($array);

Result

Array

(
    [0] => id_no_1
    [1] => id_no_2
    [2] => title_1
    [3] => title_2
)

You can not specify the key with array_push. You probably want to use pretty much the same syntax here, as was just explained to you under your other recent question, stackoverflow.com/questions/60414697 — C3roe
– C3roe, Commented Feb 26, 2020 at 14:45
You want to take the key from one of your input arrays, and the value for the sub-array from the other input array - so you need to correlate both somehow, instead of looping through them separately. A for instead of a foreach loop might make more sense here, it will allow you to use the loop counter to access the corresponding values from both at the same time. — C3roe
– C3roe, Commented Feb 26, 2020 at 14:48
@CBroe Your suggestion fits best to the question, and is the most straightforward way. Please move the comment to an answer and I will approve it. — Toolbox
– Toolbox, Commented Feb 26, 2020 at 17:17

C3roe · Accepted Answer · 2020-02-27 07:38:30Z

1

You want to take the key from one of your input arrays, and the value for the sub-array from the other input array - so you need to correlate both somehow, instead of looping through them separately.

A for instead of a foreach loop might make more sense here, it will allow you to use the loop counter to access the corresponding values from both at the same time.

answered Feb 27, 2020 at 7:38

C3roe

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Comments

Beniamin · Accepted Answer · 2020-02-26 14:54:08Z

1

There is simple solution for your problem with one foreach:

    foreach ($taxonomy_id as $key => $item) {
        $array[$item][] = $titles[$key] ?? null;
    }

edited Feb 26, 2020 at 14:54

answered Feb 26, 2020 at 14:48

Beniamin

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1 Comment

Alberto Moro Over a year ago

?? null was a nice touch

Don't Panic · Accepted Answer · 2020-02-26 14:58:51Z

1

I would do it like this:

$result = array_combine($taxonomy_id, array_chunk($titles, 1));

array_chunk($titles, 1) puts each of the title strings inside an array, then you can use the result of that as the values for array_combine().

I do wonder where the original $taxonomy_id and $titles arrays came from, though. If possible I would rather look for a way to combine them at the time they're created instead of trying to stick them together like this.

answered Feb 26, 2020 at 14:58

Don't Panic

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2 Comments

Alberto Moro Over a year ago

smart solution but be careful Both parameters should have an equal number of elements

Don't Panic Over a year ago

@AlbertoMoro Yes, that is definitely important. But if both parameters don't have an equal number of elements we shouldn't be trying to do this to begin with because the results won't line up correctly regardless of how we do it, and if we can somehow know for sure that both parameters have an equal number of elements, then I think this probably could have been done more simply earlier in the process.

Alberto Moro · Accepted Answer · 2020-02-26 14:59:30Z

0

You can do this by nesting the two foreach:

$array = [];
foreach ($taxonomy_id as $key => $value) {
    foreach ($titles as $key2 => $value2) {
        if ($key == $key2) {
            $array[$value][] = $value2;
        }
    }
}

You can test HERE

edited Feb 26, 2020 at 14:59

answered Feb 26, 2020 at 14:49

Alberto Moro

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