汉字转unicode php-关于unicode的转码

<?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 $string = &#39;result: {"errorcode":"1","errormsg":"\u65b0\u589e\u5931\u8d25\uff01","result":""}&#39;;
function unicode($str, $encoding = null) {
	return preg_replace_callback ( &#39;/\\\\u([0-9a-fA-F]{4})/u&#39;, create_function ( &#39;$matches&#39;, &#39;return mb_convert_encoding(pack("H*", $matches[1]), "utf-8", "UTF-16BE");&#39; ), $str );
}
echo unicode ( $string );