PHP json_encode从unicode字符返回null值

我有以下数组：

Array
(
    [BookDateID] => 4
    [HotelName] => Adams’ Inn
)

输出：

{"BookDateID":"4","HotelName":null}

有什么魔力？

顺便说一句,我有一个替代解决方案,通过循环每个数组,并让他们mb_convert_encoding(str,’HTML-ENTITIES’),但我希望该字符保持相同,我必须将其插入到数据库中.

foreach($array as $key=>$value){
    $array[$key] = mb_convert_encoding($value,'HTML-ENTITIES');
}

解决方法:

json_encode需要UTF-8编码数据.确保数据是UTF-8编码的;目前它可能是Latin-1编码的.如何做到这一点取决于数据来自何处.阅读What Every Programmer Absolutely, Positively Needs To Know About Encodings And Character Sets To Work With Text和Handling Unicode Front To Back In A Web App.