(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
面向对象风格
过程化风格
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.
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 #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.