php数组转json展示中文的一句代码，求解释

function arrayRecursive(&$array, $function, $apply_to_keys_also = false)<br />
{<br />
    static $recursive_counter = 0;<br />
    if (++$recursive_counter > 1000) {<br />
        die('possible deep recursion attack');<br />
    }<br />
    foreach ($array as $key => $value) {<br />
        if (is_array($value)) {<br />
            arrayRecursive($array[$key], $function, $apply_to_keys_also);<br />
        } else {<br />
            $array[$key] = $function($value);<br />
        }<br />
        if ($apply_to_keys_also && is_string($key)) {<br />
            $new_key = $function($key);<br />
            if ($new_key != $key) {<br />
                $array[$new_key] = $array[$key];<br />
                unset($array[$key]);<br />
            }<br />
        }<br />
    }<br />
    $recursive_counter--;<br />
}

function JSON($array) {<br />
 arrayRecursive($array, 'urlencode', true);<br />
 $json = json_encode($array);<br />
 return urldecode($json);<br />
}

$array[$key] = $function($value);