PHP Array rearrange numeric key as parrent key

Question

i want to rearrange a simple multidimensional array.

Array
    (
        [pieces] => Array
            (
                [0] => 2
                [1] => 9
            )
        [start] => Array
            (
                [0] => 0001
                [1] => 9901
            )
        [end] => Array
            (
                [0] => 0002
                [1] => 9909
            )
        [group] => Array
            (
                [0] => 0001-0100
                [1] => 9901-9999
            )
    )

to

Array
(
    [tokens] => Array
        (
            [0] =>  Array
                (
                    [start] => 0001
                    [end] => 0002
                    [pieces] => 2
                    [group] => 0100
                )
            [1] =>  Array
                (
                    [start] => 9901
                    [end] => 9909
                    [pieces] => 9
                    [group] => 9901-9999
                )
        )
)

I have tried something similar this:

$keys = array_keys($array);
foreach ($keys as $key => $val) {       
    foreach ($array as $k => $v){
        foreach($array[$v] as $tk => $tv){
            if($val == $k){
                $new['tokens'][][$val] = $tv;
            }
        }
    }
}

The numeric is the set of tokens which i prosted from my form,

Please can anyone explain me what i do wrong? I am working some hours with different codes (i know the solution is very simple) but I am a little bit confused :/

Thank you very much!

BR KK

Sammitch · Accepted Answer · 2019-01-02 21:00:33Z

3

The Fourth Bird's solution is quite rigid in that it:

Requires an explicitly-defined key in the loop condition.
Enforces that the entire result has no more items than that one key has.
Assumes and enforces that the input keys are sequential and zero-indexed.

The below will work no matter what:

foreach( $array as $y => $inner ) {
    foreach( $inner as $x => $value ) {
        $new['tokens'][$x][$y] = $value;
    }
}

Demo: https://3v4l.org/Rmdtd

Edit: I think it's worth preserving The Fourth Bird's explanation of the trouble with the posted code from his now-deleted answer:

You are trying to index into $array[$v], but $v in the case is one of the sub arrays. According to the array docs:

Arrays and objects can not be used as keys. Doing so will result in a warning: Illegal offset type.

Make sure that you have error_reporting turned up to E_ALL while you're developing code so that you can see non-critical messages that indicate current and/or future problems.

edited Jan 2, 2019 at 21:00

answered Jan 2, 2019 at 20:17

Sammitch

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2 Comments

user10859447 Over a year ago

thank you very much! I am so stupid! at first i had the same iteration like yours but i tought i have to do something with "if"-statements and linked the fals vars to $new and was wondering why i do not get the result. Thanks for clarification!

The fourth bird Over a year ago

Thats better indeed! +1

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