php echo emoji 变成问号，但是粘贴到这里就可以了

Question

这个字符串我从mysql复制并发布到这里自动成为表情符号图标，小霸王😎

但是，当我用php回显这个字符串时，就变成小霸王了？。

为什么？

这就是我从mysql代码中选择的方式

<?php
$Recordset1 = new WA_MySQLi_RS("Recordset1",$locahost,0);  
$Recordset1->setQuery('SET character set utf8mb4');
$Recordset1->setQuery('SET NAMES utf8mb4');  
$Recordset1->setQuery(  
"   
SELECT tbl_trans.trans_username,  
    Sum(Case When tbl_trans.trans_type <> 'REWARD' AND   tbl_trans.trans_winlose <> 'QB' then  
         trans_winloseamount Else 0 End) BETHOST,  
    Sum(Case When tbl_trans.trans_winlose = 'QB'  then  
         trans_winloseamount Else 0 End) QB,   
     Sum(Case When tbl_trans.trans_type = 'REWARD'  then  
         trans_winloseamount Else 0 End) REWARD ,  
    Sum(Case When tbl_trans.trans_type <> '' then  
         trans_winloseamount Else 0 End) NETWINLOSE  
 FROM tbl_trans   
 WHERE (trans_datetime >  '".$datefrom. " 14:00:00' AND trans_datetime <   '".$dateto." 12:00:00')  
 GROUP BY trans_username");  

$Recordset1->execute();  
?>`  

和 .php html 文件 <meta charset='utf-8'>

我已经尝试过header('Content-type: text/plain; charset=utf-8')

和
ALTER DATABASE wxbot_backup CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci; ALTER TABLE tbl_trans CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci; ALTER TABLE tbl_trans charset=utf8mb4, MODIFY COLUMN trans_username VARCHAR(45) CHARACTER SET utf8mb4

还有一件事我无法将其设置为 utf8mb4

mysql> SHOW VARIABLES LIKE 'character_set%'; SHOW VARIABLES LIKE 'collation%'; +--------------------------+---------------------------------------------------- -----+ | Variable_name | Value | +--------------------------+---------------------------------------------------- -----+ | character_set_client | gbk | | character_set_connection | gbk | | character_set_database | utf8 | | character_set_filesystem | binary | | character_set_results | gbk | | character_set_server | utf8 | | character_set_system | utf8 | | character_sets_dir | C:\Program Files\MySQL\MySQL Server 5.6\share\chars ets\ | +--------------------------+---------------------------------------------------- -----+ 8 rows in set (0.00 sec)

以及如何设置character_set_client到 utrfmb4 ？我使用的是 Windows 7

问题是什么？

更新

mysql 看起来像这样

Answer 1

使用 PHP 代码解决问题

$locahost->set_charset('utf8mb4');