Recursively map a string function from a array/object

example.php

<?php

//Array from JSON Webservice 
$array = array();

//Decoding all values from UTF-8
str_recursive_map('utf8_decode',$array);

//Applying htmlentities ( Good for other charset )
str_recursive_map('htmlentities',$array);

str_recursive_map.php

<?php

if(!function_exists('str_recursive_map')) {
    function str_recursive_map($fn,&$input) {
        if (is_string($input)) {
            $input = $fn($input);
        } else if (is_array($input)) {
            foreach ($input as &$value) {
                str_recursive_map($fn,$value);
            }
            unset($value);
        } else if (is_object($input)) {
            $vars = array_keys(get_object_vars($input));

            foreach ($vars as $var) {
                str_recursive_map($fn,$input->$var);
            }
        }
    }
    
}