Returns the number of warnings generated by the most recently executed query

# mysqli::$warning_count

# mysqli_warning_count

(PHP 5, PHP 7, PHP 8)

mysqli::$warning_count -- mysqli_warning_count — Returns the number of warnings generated by the most recently executed query

### 说明

面向对象风格

int $mysqli->warning_count;

过程化风格

function mysqli_warning_count(mysqli `$mysql`): int

Returns the number of warnings generated by the most recently executed query.

> 注意: For retrieving warning messages the following SQL command can be used: `SHOW WARNINGS [limit row_count]`.

### 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

Number of warnings or zero if there are no warnings.

### 示例

示例 #1 $mysqli->warning_count example

面向对象风格

    <?php

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

    $mysqli->query("SELECT 42/0");

    if ($mysqli->warning_count > 0) {
        $result = $mysqli->query("SHOW WARNINGS");
        $row = $result->fetch_row();
        printf("%s (%d): %s\n", $row[0], $row[1], $row[2]);
    }

过程化风格

    <?php

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

    mysqli_query($link, "SELECT 42/0");

    if (mysqli_warning_count($link) > 0) {
        $result = mysqli_query($link, "SHOW WARNINGS");
        $row = mysqli_fetch_row($result);
        printf("%s (%d): %s\n", $row[0], $row[1], $row[2]);
    }

以上示例会输出：

    Warning (1365): Division by 0

### 参见

- mysqli_errno() - 返回最近函数调用的错误代码
- mysqli_error() - Returns a string description of the last error
- mysqli_sqlstate() - 返回上一次 MySQL 操作的 SQLSTATE 错误

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