Function file will not recognize included PDO database connection - php

Question

I have a func.php file that contains a function that gets my user's details:
require_once 'connection.php';
function getUI($username){
$query = "SELECT * FROM usernames WHERE username = ?";
$sth = $pdo->prepare($query);
$sth->bindValue(1, $username);
$sth->execute();
$result = $sth->fetch(PDO::FETCH_ASSOC);
return $result;
}
in my connection.php I have:
require_once 'details.php';
$pdo = new PDO("mysql:host=" . $dabhost . "; dbname=" . $dabname ."", $dabusern, $dabpassw);
and in details.php I have:
$dabhost = "localhost";
$dabname = "dab1";
$dabusern = "root";
$dabpassw = "root";
And ultimately, I have my userdetails.php that has a bunch of HTML code and displays the results that the function getUI() would bring back. I require func.php at the beginning:
require_once 'folder1/func.php';
My directory looks like this:
rootfolder/userdetails.php
rootfolder/folder1/details.php
rootfolder/folder1/connection.php
rootfolder/folder1/func.php
The issue is that when I open userdetails.php, I get an error in my php_error.log file that says the following:
PHP Notice: Undefined variable: pdo in /rootfolder/folder1/func.php on line 58
PHP Fatal error: Call to a member function prepare() on null in /rootfolder/folder1/func.php on line 58
Where if I were to just put all the code at the top of my userdetails.php, it would work and bring back the expected results. Therefore, there is something wrong with how I am requiring the files/scope of the variables I think...
Could someone explain to me what am I doing wrong?
Your help is much appreciated!
Thanks a lot!
UPDATE:
Passing my $pdo connection as a second argument in the function solved my proble, but now I am unable to retrieve x result from my returned $return variable, for instance:
echo $result['date'];
It says that the variable $result is not defined. Any idea why is this occurring?
Thanks a lot again!

Answer 1

When you declare
function getUI($username) {}
$pdo is not available because it is outside the scope of the function.
You'll need to pass it in as an additional parameter or find some other mechanism for getting $pdo inside getUI().
If you need more information

Answer 2

require_once 'connection.php';
function getUI($username,$pdo){
$result = null ;
$query = "SELECT * FROM usernames WHERE username = ?";
$sth = $pdo->prepare($query);
$sth->bindValue(1, $username);
$sth->execute();
$result = $sth->fetch(PDO::FETCH_ASSOC);
return $result;
}
Note : Pass PDO object as second parameter when you call above function.