Problem connecting sqlite3 and php on linux

I have Apache web server installed on Manjaro(Sway) linux, and default location of projects is: /srv/http/

I have created a folder for my project by the name test in the location and have created a database named db1.db inside it through terminal using the following steps (followed this article):

sqlite3 db1

sqlite> create table tblone(one varchar(10), two smallint);

sqlite> insert into tblone values('helloworld',20);
sqlite> insert into tblone values('linux', 30);

I can verify that the table has been created successfully by running the following command:

sqlite> select * from tblone;

which outputs:

helloworld|20
linux|30

I need to create a PHP file which connects the above created database using PDO.

So, inside test folder, I create a file index.php with the following content:

<?php
    $myPDO = new PDO('sqlite:test/db1.db');
    $result = $myPDO->query("SELECT * FROM tblone");
    foreach($result as $row){
        echo $row['one']. "\n";
    }
?>

But I get a blank white screen in output, when I enter http://localhost/test/index.php in browser. Where am I going wrong?