Please How can I convert the following object oriented PDO fetch_assoc to MYsqli Format below.

#sql #php

Hi Great Developers, I am having a difficult time fetching data from my database using object PHP as below.

So I have two pages,

One for fetching data from my DB and returning it
And another for displaying the data from my database fetched from the first page.

As Below
The code below is a function written with PDO

First page.

function get_messages() 
{
//fetch data from db

$sql="SELECT user_name, msg, timestamp FROM message_chat";

//prepare and execute. 
$stmt=$conn->prepare($sql);

$stmt->execute() ;

//Now this is the line thats making things complicated. 

return $stmt->fetchAll(PDO::FETCH_ASSOC) ;
}

Now, the second page is meant to return the generated data's from the above code, but its not happening.
Please how can I convert the above PDO fetch_assoc statement to mysqli so I can use it in my project.