# mysqli_stmt::$num_rows

# mysqli_stmt::num_rows

# mysqli_stmt_num_rows

(PHP 5, PHP 7, PHP 8)

mysqli_stmt::$num_rows -- mysqli_stmt::num_rows -- mysqli_stmt_num_rows — Returns the number of rows fetched from the server

### 说明

面向对象风格

int|string $mysqli_stmt->num_rows;
public mysqli_stmt::num_rows(): int|string

过程化风格

mysqli_stmt_num_rows(mysqli_stmt `$statement`): int|string

Returns the number of rows buffered in the statement. This function will only work after mysqli_stmt_store_result() is called to buffer the entire result set in the statement handle.

This function returns `0` unless all rows have been fetched from the server.

### 参数

`statement`

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

### 返回值

An int representing the number of buffered rows. Returns `0` in unbuffered mode unless all rows have been fetched from the server.

> 注意:

> If the number of rows is greater than `PHP_INT_MAX`, the number will be returned as a string.

### 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");
$query = "SELECT Name, CountryCode FROM City ORDER BY Name LIMIT 20";
$stmt = $mysqli->prepare($query);
$stmt->execute();
/* store the result in an internal buffer */
$stmt->store_result();
printf("Number of rows: %d.\n", $stmt->num_rows);`

示例 #2 过程化风格

`<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
$query = "SELECT Name, CountryCode FROM City ORDER BY Name LIMIT 20";
$stmt = mysqli_prepare($link, $query);
mysqli_stmt_execute($stmt);
/* store the result in an internal buffer */
mysqli_stmt_store_result($stmt);
printf("Number of rows: %d.\n", mysqli_stmt_num_rows($stmt));`

以上示例会输出：

    Number of rows: 20.

### 参见

- mysqli_stmt_store_result() - Stores a result set in an internal buffer
- mysqli_stmt_affected_rows() - Returns the total number of rows changed, deleted, inserted, or matched by the last statement executed
- mysqli_prepare() - 预处理执行 SQL

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