unicode编码转汉字

问题：
使用json_encode方法，中文未做处理，转变成Unicode编码，中文字符显示串乱码
解决示例：

1. 已存储为json格式字符串，正则替换

ini_set("max_execution_time", -1);//php脚本执行时间限制处理
$arr = array(42, 66, 69, 71);
$strs = Adlog::where('type', 1)->select('id','msg_str')->get();
$sql = "update ad_log set msg_str = case id ";
$ids = array();
foreach ($strs as $k => $v){
$ids[] =$v->id;
if(in_array($v->id,$arr)){//中文字符串显示为类似u65b0u6d6au5faeu535a 情况
$v->msg_str = preg_replace("#u([0-9a-f]{4})#ie","iconv('UCS-2','UTF-8', pack('H4', '\\1'))", $v->msg_str);
$msg = preg_replace("#u([0-9a-f]{4})#ie","iconv('UCS-2','UTF-8', pack('H4', '\\1'))", $v->msg_str);
    }else{//字符串正常显示情况\u65b0\u6d6a\u5fae\u535a
$v->msg_str = preg_replace("#\\\u([0-9a-f]{4})#ie","iconv('UCS-2','UTF-8', pack('H4', '\\1'))", $v->msg_str);
$msg = preg_replace("#\\\u([0-9a-f]{4})#ie","iconv('UCS-2','UTF-8', pack('H4', '\\1'))", $v->msg_str);
    }
$sql .= 'when '.$v->id.' then \''.$msg.'\' ';
}
header('content-type:text/html;charset=utf-8');
//dd($strs->toArray());die;
//sql语句输出
$sql .= 'end where id in ('.implode(',', $ids).')';
//echo $sql;die;
$r = DB::update($sql);
echo $r;die;

1. 未存储时，处理
   先将字符串urlencode，在json_encode,在urldecode
   解决示例：

$aInfo = array(
'hospital' => urlencode(Hospitaluser::find($iHospitalid)->hospital),
'hospital_id' => $iHospitalid,
);
$aInfo = urldecode(json_encode($aInfo));//中文Unicode转义处理

针对数组处理方式–借鉴~

function encode_json($str) {  
return urldecode(json_encode(url_encode($str)));      
} 
function url_encode($str) {  
if(is_array($str)) {  
foreach($str as $key=>$value) {  
$str[urlencode($key)] = url_encode($value);  
        }  
    } else {  
$str = urlencode($str);  
    }  

return $str;  
}