Returns the number of columns in the given statement

# mysqli_stmt::$field_count

# mysqli_stmt_field_count

(PHP 5, PHP 7, PHP 8)

mysqli_stmt::$field_count -- mysqli_stmt_field_count — Returns the number of columns in the given statement

### 说明

面向对象风格

int $mysqli_stmt->field_count;

过程化风格

function mysqli_stmt_field_count(mysqli_stmt `$statement`): int

Returns the number of columns in the prepared statement.

### 参数

`statement`
  仅以过程化样式：由 mysqli_stmt_init() 返回的 mysqli_stmt 对象。

### 返回值

Returns an integer representing the number of columns.

### 示例

示例 #1 面向对象风格

    <?php

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

    $code = 'FR';

    $stmt = $mysqli->prepare("SELECT Name FROM Country WHERE Code=?");
    $stmt->bind_param('s', $code);
    $stmt->execute();
    $row = $stmt->get_result()->fetch_row();
    for ($i = 0; $i < $stmt->field_count; $i++) {
        printf("Value of column number %d is %s", $i, $row[$i]);
    }

示例 #2 过程化风格

    <?php

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

    $code = 'FR';

    $stmt = mysqli_prepare($mysqli, "SELECT Name FROM Country WHERE Code=?");
    mysqli_stmt_bind_param($stmt, 's', $code);
    mysqli_stmt_execute($stmt);
    $result = mysqli_stmt_get_result($stmt);
    $row = mysqli_fetch_row($result);
    for ($i = 0; $i < mysqli_stmt_field_count($stmt); $i++) {
        printf("Value of column number %d is %s", $i, $row[$i]);
    }

以上示例的输出类似于：

    Value of column number 0 is France

### 参见

- mysqli_stmt_num_rows() - Returns the number of rows fetched from the server

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