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<?php
$b = ['a', 'b', 'c',];
$a = [];
$tmp = &$a;
foreach($b as $v) {
  $tmp[$v] = [];
  $tmp = &$tmp[$v];
}
var_dump($a);

Success #stdin #stdout 0.04s 82560KB

stdin

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Standard input is empty

stdout

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array(1) {
  ["a"]=>
  array(1) {
    ["b"]=>
    array(1) {
      ["c"]=>
      &array(0) {
      }
    }
  }
}

https://ideone.com/A1vxHP

language:

PHP (php 7.3.5)

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