我想回复在我的网站上注册的人数只有我的代码不起作用,它告诉我它不可能已转换为字符串。另外,当我把它作为一个函数在HTML中调用时,我会得到一个错误,即$connection是未定义的
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;}
如何在打印注册人数的页面上调用的函数中获取此信息?
首先,由于速度问题,您应该使用count
:
$sql = "SELECT COUNT(id) FROM persons";
要编写返回数字的函数,可以执行类似的操作
function registredMemberCount ($connection)
{
$sql = "SELECT COUNT(id) FROM persons";
$result = mysqli_query($connection,$sql);
$rows = mysqli_fetch_row($result);
return $rows[0];
}
并用称之为
registredMemberCount($connection);
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();
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;
}
你可以这样打电话和回音。
echo total_num_users();