php - fatal error : Call to a member function connect() on null

Question

尝试将 config.php 中的“覆盖”功能包含到其他 php 页面中。

索引.php:

<?php include("./config/config.php");
over_lay(); ?>
//// html code ////

错误是:

Fatal error: Call to a member function connect() on null in ...\config\config.php on line 182

config.php 的一部分:

include("./config/mysql.php");
function over_lay()
{
$mysqli->connect();
?>
//// html code with partly mysqli requests ////
<?php
  $mysqli->close();
}
?>

最后是 mysql.php:

<?php
function connect() 
{
$mysqli = new mysqli("localhost","root","","database_name");
$mysqli->query("SET NAMES utf8");
return $mysqli;
}
?>

我正在 OpenServer 上测试这个，当然我有数据库。

Answer 1

调用 over_lay 中的函数

include("./config/mysql.php");
function over_lay()
{
    $mysqli = connect();
     ?>
     //// html code with partly mysqli requests ////
     <?php
     $mysqli->close();
 }

更新我只是改变了

$mysqli->connect();

到

$mysqli = connect();