Convert array of array indices to value in multidimensional array of dynamic size

Question

i have an array as below :

test[
0 => 0,
1 => 2 ,
2 => 0,
3 => 2
]

the above array values are a representation on index of a larger array , so i need to covert the values to index of another array which will map the larger array as to achive below :

test2[0][2][0][2]

i tried :

$test3= array_flip ( $test )

works ok but is not convinient as to collisions as i dont have controll of the array , any help ?

You're trying to turn array of elements into arrays. In other words you're trying to create a nested array. There is no built in php function to dot his. You have to write it yourself. — John Conde
– John Conde, Commented Mar 24, 2016 at 18:04
@JamesPaterson that will work but i dont know the lenght of array as its dynamic — Jimmy Obonyo Abor
– Jimmy Obonyo Abor, Commented Mar 24, 2016 at 18:15

James Paterson · Accepted Answer · 2016-03-24 18:43:21Z

1

function arrayToIndex($array,$index) {
        $element = $array;
            for ($i = 0; $i < count($index); $i++) {
                    $element = $element[$index[$i]];
            }
            return $element;
    }
$test = [[[[1],[2]],[[3],[4]]],[[[5],[6]],[[7],[8]]]];
$index = [0,1,0,0];
echo arrayToIndex($test,$index);

Here's a function that implements the behaviour you asked for. $array is the array to search into, and $index is the array of indexes. I suggest you play around with this example and see how each value is retrieved.

Live example: http://ideone.com/fork/BzCjcK

edited Mar 24, 2016 at 18:43

answered Mar 24, 2016 at 18:37

James Paterson

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3 Comments

Jimmy Obonyo Abor Over a year ago

returns 3 , my end game is to get an array index representation as in $index in your example

James Paterson Over a year ago

This is working off the test data $test and $index. You'll need to copy just the function and call the function as arrayToIndex($test2,$test) in your OP example. It returns three because that is the element at $test[0][1][0][0].

Jimmy Obonyo Abor Over a year ago

again , $test2 is the end result of values of $test1 , i have know idea what $test2 is i need to get $test2 from values of $test

Jimmy Obonyo Abor · Accepted Answer · 2016-03-24 20:03:25Z

so after head i came up with below function which served my purpose :

$mainarray = [

0 => [
   0 =>[
      0 => [
         0 => 'one' ,
         1 => 'two' ,
         2 => 'three' ,
         3 => 'four'
      ],

      1 => [
         0 => 'one' ,
         1 => 'two' ,
         2 => 'three' ,
         3 => 'four'
      ]


   ]
]

]

Then this array below has the values as the index of the $mainarray above of what i want to get lets say one as above ,

$arraywithseacrhindex = [
0 => 0 , 
1 => 0 ,
2 => 0 ,
3 => 0 ,
]

Solution :

$array = $mainarray ;
$arr = $arraywithseacrhindex ;
$counter= count($arr)-1 ;
$result = array() ;
for($i=0; $i< $counter; $i++) {

    if(empty( $result ) )
    {
        // first loop to put $result at per with $array
        $result[$arr[$i]] = $array[$arr[$i]]  ; 
    }else{
            // this is the trick of the solution
            $cResult = current($result);
            unset($result);
            $result = array() ;
            $result[$arr[$i]] = $cResult[$arr[$i]]  ; 




    }

}

var_dump($result);

Hope it helps someone in future .

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