Array Replace Recursive and Clean Out Keys with Null Value

replace_and_clean.php

<?php // https://3v4l.org/5fRhD

function ArrayCleaner($input) { 
  foreach ($input as &$value) { 
    if (is_array($value)) { 
      $value = ArrayCleaner($value); 
    }
  }

  return array_filter($input, function($item){
    return $item !== null && $item !== '';
  }); 
}

print_r( ArrayCleaner(
    array_replace_recursive(
        array( "a" => "apple", "b" => "banana", "c" => array("cherry" => "red", "cucumber" => "green"))
        ,
        array("a" => "aardvark", "c" => array("calendar" => "dates", "cherry" => "bomb", "cucumber" => null))
        )
        )
    );

Array
(
    [a] => aardvark
    [b] => banana
    [c] => Array
        (
            [cherry] => bomb
            [calendar] => dates
        )

)