mysql_set_charset

(PHP 5 >= 5.2.3)

mysql_set_charset设置客户端的字符集

警告

本扩展自 PHP 5.5.0 起已废弃,并在自 PHP 7.0.0 开始被移除。应使用 MySQLiPDO_MySQL 扩展来替换之。参见 MySQL:选择 API 指南来获取更多信息。用以替代本函数的有:

说明

mysql_set_charset(string $charset, resource $link_identifier = NULL): bool

设置当前连接的默认字符集。

参数

charset

一个有效的字符集名称。

link_identifier

MySQL 连接。如不指定连接标识,则使用由 mysql_connect() 最近打开的连接。如果没有找到该连接,会尝试不带参数调用 mysql_connect() 来创建。如没有找到连接或无法建立连接,则会生成 E_WARNING 级别的错误。

返回值

成功时返回 true, 或者在失败时返回 false

注释

注意:

本函数需要 MySQL 5.0.7 或更高版本。

注意:

这是改变字符集的最佳方式。不推荐您使用 mysql_query() 来设置 (比如 SET NAMES utf8)。 更多信息参见 MySQL character set concepts 一节。

添加备注

用户贡献的备注 3 notes

up
33
Ashus
16 years ago
I needed to access the database from within one particular webhosting service. Pages are UTF-8 encoded and data received by forms should be inserted into database without changing the encoding. The database is also in UTF-8.

Neither SET character set 'utf8' or SET names 'utf8' worked properly here, so this workaround made sure all variables are set to utf-8.

<?php

// ... (creating a connection to mysql) ...

mysql_query("SET character_set_results = 'utf8', character_set_client = 'utf8', character_set_connection = 'utf8', character_set_database = 'utf8', character_set_server = 'utf8'", $conn);

$re = mysql_query('SHOW VARIABLES LIKE "%character_set%";')or die(mysql_error());
while (
$r = mysql_fetch_assoc($re)) {var_dump ($r); echo "<br />";} exit;

?>

All important variables are now utf-8 and we can safely use INSERTs or SELECTs with mysql_escape_string($var) without any encoding functions.
up
15
nabeelmoidu at gmail dot com
16 years ago
Here's an example of how to use this feature :

I'm using PHP 5.2.5 from http://oss.oracle.com/projects/php/

I wanted to store arabic characters as UTF8 in the database and as suggested in many of the google results, I tried using

mysql_query("SET NAMES 'utf8'");

and

mysql_query("SET CHARACTER SET utf8 ");

but it did not work.

Using the following, it worked flawlessly

$link = mysql_connect('localhost', 'user', 'password');
mysql_set_charset('utf8',$link);

Once this is set we need not manually encode the text into utf using utf8_encode() or other functions. The arabic ( or any UTF8 supported ) text can be passed directly to the database and it is automatically converted by PHP.
For eg.
<?php
$link
= mysql_connect('localhost', 'user', 'password');
mysql_set_charset('utf8',$link);
$db_selected = mysql_select_db('emp_feedback', $link);
if (!
$db_selected) { die ('Database access error : ' . mysql_error());}
$query = "INSERT INTO feedback ( EmpName, Message ) VALUES ('$_empName','$_message')";
mysql_query($query) or die('Error, Feedback insert into database failed');
?>
Note that here $_empName is stored in English while $_message is in Arabic.
up
1
Janez R.
17 years ago
I assume that this is an equivalent in previous versions of php (add some parameter validation and default values though!):
<?
if (!function_exists('mysql_set_charset')) {
function
mysql_set_charset($charset,$dbh)
{
return
mysql_query("set names $charset",$dbh);
}
}
?>
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