Returns a string description of the last error

# mysqli::$error

# mysqli_error

(PHP 5, PHP 7, PHP 8)

mysqli::$error -- mysqli_error — Returns a string description of the last error

### 说明

面向对象风格

string $mysqli->error;

过程化风格

function mysqli_error(mysqli `$mysql`): string

Returns the last error message for the most recent MySQLi function call that can succeed or fail.

### 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

A string that describes the error. An empty string if no error occurred.

### 示例

示例 #1 $mysqli->error example

面向对象风格

    <?php
    $mysqli = new mysqli("localhost", "my_user", "my_password", "world");

    /* check connection */
    if ($mysqli->connect_errno) {
        printf("Connect failed: %s\n", $mysqli->connect_error);
        exit();
    }

    if (!$mysqli->query("SET a=1")) {
        printf("Error message: %s\n", $mysqli->error);
    }

    /* close connection */
    $mysqli->close();
    ?>

过程化风格

    <?php
    $link = mysqli_connect("localhost", "my_user", "my_password", "world");

    /* check connection */
    if (mysqli_connect_errno()) {
        printf("Connect failed: %s\n", mysqli_connect_error());
        exit();
    }

    if (!mysqli_query($link, "SET a=1")) {
        printf("Error message: %s\n", mysqli_error($link));
    }

    /* close connection */
    mysqli_close($link);
    ?>

以上示例会输出：

    Error message: Unknown system variable 'a'

### 参见

- mysqli_connect_errno() - Returns the error code from last connect call
- mysqli_connect_error() - Returns a description of the last connection error
- mysqli_errno() - 返回最近函数调用的错误代码
- mysqli_sqlstate() - 返回上一次 MySQL 操作的 SQLSTATE 错误

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