返回当前数据库连接的字符编码

# mysqli::character_set_name

# mysqli_character_set_name

(PHP 5, PHP 7, PHP 8)

mysqli::character_set_name -- mysqli_character_set_name — 返回当前数据库连接的字符编码

### 说明

面向对象风格

public function mysqli::character_set_name(): string

过程化风格

function mysqli_character_set_name(mysqli `$mysql`): string

返回当前数据库连接的字符编码。

### 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

当前连接的字符编码

### 示例

示例 #1 mysqli::character_set_name() 示例

面向对象风格

    <?php

    mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
    $mysqli = new mysqli("localhost", "my_user", "my_password", "world");

    /* Set the default character set */
    $mysqli->set_charset('utf8mb4');

    /* Print current character set */
    $charset = $mysqli->character_set_name();
    printf("Current character set is %s\n", $charset);

过程化风格

    <?php

    mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
    $mysqli = mysqli_connect("localhost", "my_user", "my_password", "world");

    /* Set the default character set */
    mysqli_set_charset($mysqli, 'utf8mb4');

    /* Print current character set */
    $charset = mysqli_character_set_name($mysqli);
    printf("Current character set is %s\n", $charset);

以上示例会输出：

    Current character set is utf8mb4

### 参见

- mysqli_set_charset() - 设置客户端字符集
- mysqli_real_escape_string() - 根据当前连接的字符集，对于 SQL 语句中的特殊字符进行转义

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