PHP/MySQL 中的 PDO 和 UTF-8 特殊字符?

2021-12-26 00:00:00 php pdo unicode-string

我正在使用 MySQL 和 PHP 5.3 并尝试了此代码.

I am using MySQL and PHP 5.3 and tried this code.

$dbhost = 'localhost';
$dbuser = 'root';
$dbpass = '';
$con = mysql_connect("localhost", "root", "");
mysql_set_charset('utf8');
if (!$con)
{
  die('Could not connect: ' . mysql_error());
}

mysql_select_db("kdict", $con);
$sql = "SELECT * FROM `en-kh` where english='a'";
echo $sql;
$result = mysql_query($sql);

while($row = mysql_fetch_array($result))
{
  echo $row['english'] . " </br> " . $row['khmer'];
  echo "<br />";
}
?>

=> 我得到了很好的 UTF-8 渲染显示，做得很好.

=> I got good UTF-8 render display, well done.

但现在我创建了一个类 PDO 以保持易于扩展和更容易

But for now I create a class PDO to keep easy to extend and more easy

 class crud {
     // code..
     public function conn()
     {
         isset($this->username);
         isset($this->password);
         if (!$this->db instanceof PDO)
         {
             $this->db = new PDO($this->dsn, $this->username, $this->password);
             $this->db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
             $this->db->setAttribute(PDO::MYSQL_ATTR_INIT_COMMAND, "SET NAMES 'utf8'");   
          }
      }
      /*more code here*/
}



/*** a new crud object ***/
$crud = new crud();
/*** The DSN ***/
$crud->dsn = "mysql:dbname=kdict;host=localhost";

/*** MySQL username and password ***/
$crud->username = 'root';
$crud->password = '';
/*** select all records from table ***/
$records = $crud->rawSelect("SELECT * FROM `en-kh` where english='a'");

/*** fetch only associative array of values ***/
$rows = $records->fetchAll(PDO::FETCH_ASSOC);

/*** display the records ***/
foreach($rows as $row)
{
    foreach($row as $fieldname=>$value)
    {
        echo $fieldname.' = '.$value.'<br />';
    }
    echo '<hr />';
}
?>

但它显示我的角色是这样的'????'

But it displays my character something like this '????'

我在 Stack Overflow 上找到了这个链接，看起来和我遇到的问题一样PHP/MySQL 中的特殊字符

I found this link on Stack Overflow, it looks like the same problem i met Special characters in PHP / MySQL

它看起来和我的问题一样 => 我试图修复它，但我仍然无法工作.

It looks the same as my problem => I tried to fix it, but I still doesn't work.

$this->setAttribute(PDO::MYSQL_ATTR_INIT_COMMAND, "SET NAME'utf8'");

谁能告诉我是什么问题?我该如何纠正?

Can anyone tell me what the problem is? How can I correct it?

谢谢

推荐答案

你缺少一个S:它是 SET NAMES 而不是 SET NAME:

$this->setAttribute(PDO::MYSQL_ATTR_INIT_COMMAND, "SET NAMES 'utf8'");

你当然也需要取消注释.另外，PDO::MYSQL_ATTR_INIT_COMMAND 可以不设置与PDO::setAttribute() 建立数据库连接后(常量名说明了一切)，您必须指定它在 constructor 中使用 $driver_options 参数，例如这个:

You also need to un-comment it of course. Also, PDO::MYSQL_ATTR_INIT_COMMAND can not be set with PDO::setAttribute() after you've established your database connection (the constant name says it all), you've to specify it in the constructor using the $driver_options argument, like this:

$this->db = new PDO($this->dsn, $this->username, $this->password, array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES 'utf8'"));

另一种方法是在连接后立即执行相同的查询:

An alternative to this is to just execute that very same query immediately after connecting:

$this->db = new PDO($this->dsn, $this->username, $this->password);
$this->db->exec("SET NAMES 'utf8';");

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