统计数据库中的注册用户 [英] Count registered users in database

问题描述

我想回应在我的网站上注册的人数只有我拥有的代码不起作用，它告诉我它不可能转换为字符串.此外，当我将其设置为在 HTML 中调用的函数时，我收到 $connection 未定义的错误

I would like to echo the number of people registered on my website only the code that I have does not work, it gives me back that it can't be converted to string. Also when I make it a function to call in my HTML I get error that $connection is undefined

require_once("connect.php");

$sql = "SELECT * FROM persons";
if ($result=mysqli_query($connection, $sql)){
$rowcount = mysqli_num_rows($result);
mysqli_free_result($result);
return $result;}

如何在我可以在打印注册人数的页面上调用的函数中获取此信息?

How do I get this in a function that I can call on my page that prints the number of people registered?

推荐答案

首先你应该使用 count 因为速度问题:

First of all you should use count because of speed issues:

$sql = "SELECT COUNT(id) FROM persons";

要编写一个返回数字的函数，您可以执行类似的操作

To write a function that returns the number, you can do something like

function registredMemberCount ($connection) 
{
    $sql = "SELECT COUNT(id) FROM persons";
    $result = mysqli_query($connection,$sql);
    $rows = mysqli_fetch_row($result);
    return $rows[0];
}

并用

registredMemberCount($connection);

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