Description:
------------
The following code works fine under earlier PHP versions including PHP 7.0.x, however it results in fatal error "Cannot use lexical variable $variable as a parameter name inside array_walk()" under PHP 7.1

Test script:
---------------
$value = 'b';
$checkbox_values = ['a' => 'Aaa', 'b' => 'Bbb', 'c' => 'Ccc'];

    array_walk($checkbox_values, function(&$value, $key) use($value) {
      $value = (int)(strval($key) === $value);
});

print_r($checkbox_values);

Expected result:
----------------
Array
(
    [a] => 0
    [b] => 1
    [c] => 0
)

Actual result:
--------------
Fatal error: Cannot use lexical variable $value as a parameter name in / on line 4