web前端開發 - PHP輸出json到web無法正常顯示中文

PHP從mysql擷取資料後，錄入數組並轉為json。
最後輸出的時候，中文顯示為"?"。
這個問題是出在伺服器還是php？
在資料庫裡看，中文是能正常顯示的。
PHP代碼：

    $result = mysql_query("select * from hpsubject");    while ($row = mysql_fetch_array($result)) {        $arr = json_encode(array('hps_userid'=>$row['hps_userid'],                            $row['hps_userid2'], $row['hps_subid'], $row['hps_type'],            $row['hps_addr'], $row['hps_distance'], $row['hps_title'], $row['hps_feel'], $row['hps_dowhat'],            $row['hps_text'], $row['hps_img'], $row['hps_like'], $row['hps_repost'], $row['hps_comment'],            $row['hps_date'], $row['hps_time'], $row['hps_liveline'], $row['hps_deadline']));    echo $arr;    }

輸出結果：
{"hps_userid":"1","0":"1","1":"1","2":"????","3":"??","4":"50","5":"??","6":"??","7":"????","8":"??","9":"??","10":"100","11":"100","12":"100","13":"2015-09-21","14":"154436","15":"2015-09-21 15:44:36","16":"2015-09-21 15:44:36"}

回複內容：

PHP從mysql擷取資料後，錄入數組並轉為json。
最後輸出的時候，中文顯示為"?"。
這個問題是出在伺服器還是php？
在資料庫裡看，中文是能正常顯示的。
PHP代碼：

    $result = mysql_query("select * from hpsubject");    while ($row = mysql_fetch_array($result)) {        $arr = json_encode(array('hps_userid'=>$row['hps_userid'],                            $row['hps_userid2'], $row['hps_subid'], $row['hps_type'],            $row['hps_addr'], $row['hps_distance'], $row['hps_title'], $row['hps_feel'], $row['hps_dowhat'],            $row['hps_text'], $row['hps_img'], $row['hps_like'], $row['hps_repost'], $row['hps_comment'],            $row['hps_date'], $row['hps_time'], $row['hps_liveline'], $row['hps_deadline']));    echo $arr;    }

輸出結果：
{"hps_userid":"1","0":"1","1":"1","2":"????","3":"??","4":"50","5":"??","6":"??","7":"????","8":"??","9":"??","10":"100","11":"100","12":"100","13":"2015-09-21","14":"154436","15":"2015-09-21 15:44:36","16":"2015-09-21 15:44:36"}

if (function_exists('mysql_set_charset') === false) {   mysql_query("SET NAMES 'utf8'", $con);}else{   mysql_set_charset('utf8', $con);}

$con 對應 mysql_connect 函數的傳回值, 上面的 utf8 改為你資料庫的編碼(上面的代碼放在你執行mysql_query("select * from hpsubject")之前.

然後在你的php檔案頭部增加一行header('Content-Type: application/json; charset=utf-8'); 其中這裡的 utf-8 也改為你資料庫中所使用的編碼.

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