统计数据库中的注册用户
Count registered users in database
我想回显我网站的注册人数
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,当我将它作为一个函数来调用我的 HTML 时,我收到错误消息 $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?
require_once("connect.php");
function blah()
{
global $connection;
$sql = "SELECT COUNT(*) FROM persons";
if ($result=mysqli_query($connection, $sql)){
$row= mysqli_fetch_array($result);
$rowcount = $row[0];
mysqli_free_result($result);
}
return $rowcount;
}
echo blah();
首先你应该使用 count
因为速度问题:
$sql = "SELECT COUNT(id) FROM persons";
要编写一个 returns 数字的函数,你可以这样做
function registredMemberCount ($connection)
{
$sql = "SELECT COUNT(id) FROM persons";
$result = mysqli_query($connection,$sql);
$rows = mysqli_fetch_row($result);
return $rows[0];
}
并用
调用它
registredMemberCount($connection);
让我们看看这个,
require('connect.php');
function total_num_users(){
$sql = "SELECT * FROM persons";
$result = mysqli_query($connection,$sql);
$count = mysqli_num_rows($result);
return $count;
}
你可以像这样调用和回显它。
echo total_num_users();
我想回显我网站的注册人数 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,当我将它作为一个函数来调用我的 HTML 时,我收到错误消息 $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?
require_once("connect.php");
function blah()
{
global $connection;
$sql = "SELECT COUNT(*) FROM persons";
if ($result=mysqli_query($connection, $sql)){
$row= mysqli_fetch_array($result);
$rowcount = $row[0];
mysqli_free_result($result);
}
return $rowcount;
}
echo blah();
首先你应该使用 count
因为速度问题:
$sql = "SELECT COUNT(id) FROM persons";
要编写一个 returns 数字的函数,你可以这样做
function registredMemberCount ($connection)
{
$sql = "SELECT COUNT(id) FROM persons";
$result = mysqli_query($connection,$sql);
$rows = mysqli_fetch_row($result);
return $rows[0];
}
并用
调用它registredMemberCount($connection);
让我们看看这个,
require('connect.php');
function total_num_users(){
$sql = "SELECT * FROM persons";
$result = mysqli_query($connection,$sql);
$count = mysqli_num_rows($result);
return $count;
}
你可以像这样调用和回显它。
echo total_num_users();