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

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    User Contributed Notes 1 note

    up
    1
    jab_creations at yahoo dot com
    15 days 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%';
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