mysqli_num_rows()

实例

返回结果集中行的数量:

<?php
$con=mysqli_connect("localhost","my_user","my_password","my_db");
// Check connection
if (mysqli_connect_errno($con))
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}

$sql="SELECT Lastname,Age FROM Persons ORDER BY Lastname";

if ($result=mysqli_query($con,$sql))
{
// Return the number of rows in result set
$rowcount=mysqli_num_rows($result);
printf("Result set has %d rows.n",$rowcount);
// Free result set
mysqli_free_result($result);
}

mysqli_close($con);
?>

定义和用法

mysqli_num_rows() 函数返回结果集中行的数量。

语法

mysqli_num_rows(result);

参数 描述
result 必需。规定由 mysqli_query()、mysqli_store_result() 或 mysqli_use_result() 返回的结果集标识符。

技术细节

返回值: 返回结果集中行的数量。
PHP 版本: 5+
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