php 显示json中的中文字符

编辑代码

<?php
$arr = array('p1'=>'nihao','p2'=>2,'ch'=>'码农你好！');
$json = json_encode($arr);
echo decodeUnicode($json);

function decodeUnicode($str){
    return preg_replace_callback('/\\\\u([0-9a-f]{4})/i',
        create_function(
            '$matches',
            'return mb_convert_encoding(pack("H*", $matches[1]), "UTF-8", "UCS-2BE");'
        ),
        $str);
}
?>