中国語の文字を Unicode に変換する php-Unicode トランスコーディングについて

<?php
echo json_encode("叨嘛",JSON_UNESCAPED_UNICODE);

<?php
$array = array(&#39;doma&#39; => urlencode("叨嘛"));
$array = json_encode($array);
echo urldecode($array);

<?php
$string = 'result: {"errorcode":"1","errormsg":"\u65b0\u589e\u5931\u8d25\uff01","result":""}';
function unicode($str, $encoding = null) {
	return preg_replace_callback ( '/\\\\u([0-9a-fA-F]{4})/u', create_function ( '$matches', 'return mb_convert_encoding(pack("H*", $matches[1]), "utf-8", "UTF-16BE");' ), $str );
}
echo unicode ( $string );