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);