PHP Create depth in a multidimensionnal array dynamically [duplicate]

Question

I'm looking for a way to transform this code that works and gives me the expected result with 3 elements:

<?php
$arb = array(array("a", "b", "c"));
$arb_array = array();

foreach($arb as $a){

if(!array_key_exists($a[0], $arb_array)){
$arb_array[$a[0]] = array();
}

if(!array_key_exists($a[1], $arb_array[$a[0]])){
$arb_array[$a[0]][$a[1]]= array();
}

if(!array_key_exists($a[2], $arb_array[$a[0]][$a[1]])){
$arb_array[$a[0]][$a[1]][$a[2]]= array();
}

}
?>

into a dynamic one that could work regardless of the amount of elements present in $a But i'm stuck when i have to make the depth a php array dynamic

Thank you in advance for any suggestions !

Related: Convert flat array to multidimensional array

mickmackusa
– mickmackusa ♦

2023-09-06 05:00:35 +00:00
Commented Sep 6, 2023 at 5:00 — mickmackusa
– mickmackusa ♦, Commented Sep 6, 2023 at 5:00

Olivier · Accepted Answer · 2023-08-07 19:05:12Z

1

You can solve this with references:

$arb = array(array("a", "b", "c"));
$arb_array = array();

$arr = &$arb_array;
foreach($arb as $a) {
    foreach($a as $key) {
        if(!array_key_exists($key, $arr))
            $arr[$key] = array();
        $arr = &$arr[$key];
    }
}

print_r($arb_array);

answered Aug 7, 2023 at 19:05

Olivier

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