mysqli_result::$num_rows

mysqli_num_rows

(PHP 5, PHP 7, PHP 8)

mysqli_result::$num_rows -- mysqli_num_rows — Gets the number of rows in the result set

说明

面向对象风格

int|string $mysqli_result->num_rows;

过程化风格

mysqli_num_rows(mysqli_result $result): int|string

Returns the number of rows in the result set.

The behaviour of mysqli_num_rows() depends on whether buffered or unbuffered result sets are being used. This function returns 0 for unbuffered result sets unless all rows have been fetched from the server.

参数

result

仅以过程化样式：由 mysqli_query()、mysqli_store_result()、 mysqli_use_result()、mysqli_stmt_get_result() 返回的 mysqli_result 对象。

返回值

An int representing the number of fetched 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");

$result = $mysqli->query("SELECT Code, Name FROM Country ORDER BY Name");

/* Get the number of rows in the result set */
$row_cnt = $result->num_rows;

printf("Result set has %d rows.\n", $row_cnt);

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");

$result = mysqli_query($link, "SELECT Code, Name FROM Country ORDER BY Name");

/* Get the number of rows in the result set */
$row_cnt = mysqli_num_rows($result);

printf("Result set has %d rows.\n", $row_cnt);

以上示例会输出：

Result set has 239 rows.

注释

注意:

In contrast to the mysqli_stmt_num_rows() function, this function doesn't have object-oriented method variant. In the object-oriented style, use the getter property.

参见