将数组键及其值拆分为新变量

Question

I don't know exactly the programming terminology but I have a lot of arrays like this

$arr[3][4][0]='sample value A';
$arr[3][4][1]='sample value B';
...and so on

They have 3 keys each, so I was wondering if PHP has any function to split into values, keys and details of each var like this:

$keyA[0]=3;
$keyB[0]=4;
$keyC[0]=0;
$strg[0]='sample value A';

$keyA[1]=3;
$keyB[1]=4;
$keyC[1]=1;
$strg[1]='sample value B';

without doing a foreach inside a foreach to grab the values ?

Answer 1

$array[3][4][0] = 'sample value A';
$array[3][4][1] = 'sample value B';

$iter = new RecursiveIteratorIterator(
    new RecursiveArrayIterator($array),
    RecursiveIteratorIterator::SELF_FIRST
);

foreach ($iter as $key => $value) {
    $keys[$iter->getDepth()] = $key;    
    if(!$iter->callHasChildren()) {
        $keyA[] = $keys[0];
        $keyB[] = $keys[1];
        $keyC[] = $keys[2];
        $strg[] = $value;
    }
}

print_r($keyA);
print_r($keyB);
print_r($keyC);
print_r($strg);