Question

How to create a nested array out of an array in PHP

Answer 1

$arr = array (1, 2, 3, 4); 

$total = count($arr) - 1;

$nestedarray = array();

for($i = $total; $i >= 0; $i--) {
    $nestedarray = array($arr[$i] => $nestedarray);
}
 
print_r($nestedarray);

  
     
/*
run: 
  
Array
(
    [1] => Array
        (
            [2] => Array
                (
                    [3] => Array
                        (
                            [4] => Array
                                (
                                )

                        )

                )

        )

)
  
*/

 

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