php 数组转json,json转数组 json_encode json_decode 失败

json_encode() requires input that is
null
integer, float, boolean
string encoded as UTF-8
objects implementing JsonSerializable (or whatever it's called, I'm too lazy to look it up)
arrays of JSON-encodable objects
stdClass instances of JSON-encodable objects

json_encode 所有字符串数据的编码必须是 UTF-8，不然返回false

json_last_error_msg可以查看最新解析的错误

转化utf8函数

function ConvertToUTF8($text){

    $encoding = mb_detect_encoding($text, mb_detect_order(), false);

    if($encoding == "UTF-8")
    {
        $text = mb_convert_encoding($text, 'UTF-8', 'UTF-8');    
    }


    $out = iconv(mb_detect_encoding($text, mb_detect_order(), false), "UTF-8//IGNORE", $text);


    return $out;
}