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<?php
/**
* MySQL charset metadata and manipulations
*/
declare(strict_types=1);
namespace PhpMyAdmin;
use PhpMyAdmin\Charsets\Charset;
use PhpMyAdmin\Charsets\Collation;
use function __;
use function array_keys;
use function count;
use function explode;
use function is_string;
use function ksort;
use const SORT_STRING;
/**
* Class used to manage MySQL charsets
*/
class Charsets
{
/**
* MySQL charsets map
*
* @var array<string, string>
*/
public static $mysqlCharsetMap = [
'big5' => 'big5',
'cp-866' => 'cp866',
'euc-jp' => 'ujis',
'euc-kr' => 'euckr',
'gb2312' => 'gb2312',
'gbk' => 'gbk',
'iso-8859-1' => 'latin1',
'iso-8859-2' => 'latin2',
'iso-8859-7' => 'greek',
'iso-8859-8' => 'hebrew',
'iso-8859-8-i' => 'hebrew',
'iso-8859-9' => 'latin5',
'iso-8859-13' => 'latin7',
'iso-8859-15' => 'latin1',
'koi8-r' => 'koi8r',
'shift_jis' => 'sjis',
'tis-620' => 'tis620',
'utf-8' => 'utf8',
'windows-1250' => 'cp1250',
'windows-1251' => 'cp1251',
'windows-1252' => 'latin1',
'windows-1256' => 'cp1256',
'windows-1257' => 'cp1257',
];
/**
* The charset for the server
*
* @var Charset|null
*/
private static $serverCharset = null;
/** @var array<string, Charset> */
private static $charsets = [];
/** @var array<string, array<string, Collation>> */
private static $collations = [];
/**
* Loads charset data from the server
*
* @param DatabaseInterface $dbi DatabaseInterface instance
* @param bool $disableIs Disable use of INFORMATION_SCHEMA
*/
private static function loadCharsets(DatabaseInterface $dbi, bool $disableIs): void
{
/* Data already loaded */
if (count(self::$charsets) > 0) {
return;
}
$sql = 'SELECT `CHARACTER_SET_NAME` AS `Charset`,'
. ' `DEFAULT_COLLATE_NAME` AS `Default collation`,'
. ' `DESCRIPTION` AS `Description`,'
. ' `MAXLEN` AS `Maxlen`'
. ' FROM `information_schema`.`CHARACTER_SETS`';
if ($disableIs) {
$sql = 'SHOW CHARACTER SET';
}
$res = $dbi->query($sql);
self::$charsets = [];
foreach ($res as $row) {
self::$charsets[$row['Charset']] = Charset::fromServer($row);
}
ksort(self::$charsets, SORT_STRING);
}
/**
* Loads collation data from the server
*
* @param DatabaseInterface $dbi DatabaseInterface instance
* @param bool $disableIs Disable use of INFORMATION_SCHEMA
*/
private static function loadCollations(DatabaseInterface $dbi, bool $disableIs): void
{
/* Data already loaded */
if (count(self::$collations) > 0) {
return;
}
$sql = 'SELECT `COLLATION_NAME` AS `Collation`,'
. ' `CHARACTER_SET_NAME` AS `Charset`,'
. ' `ID` AS `Id`,'
. ' `IS_DEFAULT` AS `Default`,'
. ' `IS_COMPILED` AS `Compiled`,'
. ' `SORTLEN` AS `Sortlen`'
. ' FROM `information_schema`.`COLLATIONS`';
if ($disableIs) {
$sql = 'SHOW COLLATION';
}
$res = $dbi->query($sql);
self::$collations = [];
foreach ($res as $row) {
self::$collations[$row['Charset']][$row['Collation']] = Collation::fromServer($row);
}
foreach (array_keys(self::$collations) as $charset) {
ksort(self::$collations[$charset], SORT_STRING);
}
}
/**
* Get current server charset
*
* @param DatabaseInterface $dbi DatabaseInterface instance
* @param bool $disableIs Disable use of INFORMATION_SCHEMA
*/
public static function getServerCharset(DatabaseInterface $dbi, bool $disableIs): Charset
{
if (self::$serverCharset !== null) {
return self::$serverCharset;
}
self::loadCharsets($dbi, $disableIs);
$serverCharset = $dbi->getVariable('character_set_server');
if (! is_string($serverCharset)) {// MySQL 5.7.8 fallback, issue #15614
$serverCharset = $dbi->fetchValue('SELECT @@character_set_server;');
}
self::$serverCharset = self::$charsets[$serverCharset] ?? null;
// MySQL 8.0.11+ fallback, issue #16931
if (self::$serverCharset === null && $serverCharset === 'utf8mb3') {
// See: https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-11.html#mysqld-8-0-11-charset
// The utf8mb3 character set will be replaced by utf8mb4 in a future MySQL version.
// The utf8 character set is currently an alias for utf8mb3,
// but will at that point become a reference to utf8mb4.
// To avoid ambiguity about the meaning of utf8,
// consider specifying utf8mb4 explicitly for character set references instead of utf8.
// Warning: #3719 'utf8' is currently an alias for the character set UTF8MB3 [...]
return self::$charsets['utf8'];
}
if (self::$serverCharset === null) {// Fallback in case nothing is found
return Charset::fromServer(
[
'Charset' => __('Unknown'),
'Description' => __('Unknown'),
]
);
}
return self::$serverCharset;
}
/**
* Get all server charsets
*
* @param DatabaseInterface $dbi DatabaseInterface instance
* @param bool $disableIs Disable use of INFORMATION_SCHEMA
*
* @return array<string, Charset>
*/
public static function getCharsets(DatabaseInterface $dbi, bool $disableIs): array
{
self::loadCharsets($dbi, $disableIs);
return self::$charsets;
}
/**
* Get all server collations
*
* @param DatabaseInterface $dbi DatabaseInterface instance
* @param bool $disableIs Disable use of INFORMATION_SCHEMA
*
* @return array<string, array<string, Collation>>
*/
public static function getCollations(DatabaseInterface $dbi, bool $disableIs): array
{
self::loadCollations($dbi, $disableIs);
return self::$collations;
}
/**
* @param DatabaseInterface $dbi DatabaseInterface instance
* @param bool $disableIs Disable use of INFORMATION_SCHEMA
* @param string|null $name Collation name
*/
public static function findCollationByName(DatabaseInterface $dbi, bool $disableIs, ?string $name): ?Collation
{
$charset = explode('_', $name ?? '')[0];
$collations = self::getCollations($dbi, $disableIs);
return $collations[$charset][$name] ?? null;
}
}
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