mysql_set_charset
(PHP 5 >= 5.2.3)
mysql_set_charset — Sets the client character set
Описание
bool mysql_set_charset
( string $charset
[, resource $link_identifier
] )
Sets the default character set for the current connection.
Список параметров
- charset
-
A valid character set name.
- link_identifier
-
The MySQL connection. If the link identifier is not specified, the last link opened by mysql_connect() is assumed. If no such link is found, it will try to create one as if mysql_connect() was called with no arguments. If by chance no connection is found or established, an E_WARNING level error is generated.
Возвращаемые значения
Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.
Примечания
Замечание: This function requires MySQL 5.0.7 or later.
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Коментарии
I assume that this is an equivalent in previous versions of php (add some parameter validation and default values though!):<?
if (!function_exists('mysql_set_charset')) {
function mysql_set_charset($charset,$dbh)
{
return mysql_query("set names $charset",$dbh);
}
}
?>
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.
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.