如何从SQL数据库检索UTF-8数据？

Question

After many attempts I couldn't get data from my database in a correct encoding (UTF-8) format.

This is my connection(config.php) file:

<?php
define("DB_HOST", "localhost");
define("DB_USER", "user");
define("DB_PASSWORD", "");
define("DB_DATABASE", "db");
$dbcon = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_DATABASE);
?>

My php form for retriving data:

<?php 

include('config.php');
$sqlget="SELECT * FROM table";
$sqldata= mysqli_query($dbcon, $sqlget) or die ('error');
mysqli_set_charset('utf8');
echo"<table>";
echo"</table";
?>

Answer 1

You're not sending the link identifier mysqli_set_charset($dbcon , "utf8");

from php manual:

bool mysqli_set_charset ( mysqli $link , string $charset )

And set it before you execute the query.

Answer 2

setting encoding after SELECT is a bit late
set it before running any query

<?php
define("DB_HOST", "localhost");
define("DB_USER", "user");
define("DB_PASSWORD", "");
define("DB_DATABASE", "db");
$dbcon = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_DATABASE);
mysqli_set_charset('utf8');

Answer 3

The simplest way of achieving that is running any of these:

// for procedural MySQL (obsolete in PHP 5.4/5.5!)
mysql_query("SET NAMES 'utf8';", $link);

// for procedural MySQLi
mysqli_query("SET NAMES 'utf8';", $link);

// for MySQLi, function notation
mysqli_set_charset($link, "utf8");

// for MySQLi, method notation
$mysqli->set_charset("utf8");

// for PDO
$pdo = new \PDO("mysql:host={$host};dbname={$database};charset=utf8", $user, $password);

That will guarantee the retrieved data will be returned with UTF-8 encoding.

Hope that helps :)

Answer 4

尝试在查询之前设置字符集。

Answer 5

Order is important. You need to set connection encoding before you start executing queries, otherwise it's just too late:

mysqli_set_charset('utf8');

shall be executed just after you connect:

<?php
define("DB_HOST", "localhost");
define("DB_USER", "user");
define("DB_PASSWORD", "");
define("DB_DATABASE", "db");
$dbcon = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_DATABASE);    
mysqli_set_charset('utf8');