mysqli::get_charset

mysqli_get_charset

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

mysqli::get_charset -- mysqli_get_charset — Returns a character set object

说明

面向对象风格

public mysqli::get_charset(): ?object

过程化风格

mysqli_get_charset(mysqli $mysql): ?object

Returns a character set object providing several properties of the current active character set.

参数

mysql: 仅以过程化样式：由 mysqli_connect() 或 mysqli_init() 返回的 mysqli 对象。

返回值

The function returns a character set object with the following properties:

charset: Character set name
collation: Collation name
dir: Directory the charset description was fetched from (?) or "" for built-in character sets
min_length: Minimum character length in bytes
max_length: Maximum character length in bytes
number: Internal character set number
state: Character set status (?)

示例

示例 #1 mysqli::get_charset() example

面向对象风格

<?php
  $db = mysqli_init();
  $db->real_connect("localhost","root","","test");
  var_dump($db->get_charset());
?>

过程化风格

<?php
  $db = mysqli_init();
  mysqli_real_connect($db, "localhost","root","","test");
  var_dump(mysqli_get_charset($db));
?>

以上示例会输出：

object(stdClass)#2 (7) {
  ["charset"]=>
  string(6) "latin1"
  ["collation"]=>
  string(17) "latin1_swedish_ci"
  ["dir"]=>
  string(0) ""
  ["min_length"]=>
  int(1)
  ["max_length"]=>
  int(1)
  ["number"]=>
  int(8)
  ["state"]=>
  int(801)
}

参见

mysqli_character_set_name() - 返回当前数据库连接的字符编码
mysqli_set_charset() - 设置客户端字符集

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jab_creations at yahoo dot com ¶

4 months ago

On a new server this function was incorrectly returning "utf8mb4_general_ci".

I started a bug report and it turns out that:

1. The PHP team maintained an internal static list.
2. They ultimately decided to not be bothered to update that internal static list.

So as someone with the intentions on knowing exactly what is going on (e.g. Paris Michigan !== Paris France) I now reject the use of this function.

I'm not sure about other databases though for MariaDB you can determine the many character sets using the following SQL query:

SELECT VARIABLE_NAME, GLOBAL_VALUE, DEFAULT_VALUE 
FROM INFORMATION_SCHEMA.SYSTEM_VARIABLES 
WHERE VARIABLE_NAME LIKE '%CHAR%';