Cant connect mysql and php - php

Question

I tried to connect my MySQL database kuvarskir with my PHP code. Then inputted this into html:
<?php
include "mysql.php";
$recepti = execute_sql("SELECT * FROM recepti");
foreach($recepti as $recept)
{
?>
<article>
<h2><?=$recept["naziv"]?></h2>
<i><?=$recept["sastojci"]?></i>
<p><?=$recept["uputstvo"]?></p>
</article>
<?php
}
?>
but its not working.
i think there is error with mysql.php file, here's the code:
<?php
function init_sql()
{
global $conn;
$host = "localhost";
$db = "kuvarskir";
$username = "root";
$password = "root";
try
{
$pdo_options[PDO::ATTR_ERRMODE] = PDO::ERRMODE_EXCEPTION;
$conn = new PDO("mysql:host=$host;dbname=$db", $username, $password, $pdo_options);
}
catch(PDOException $e)
{
die("Database connection failed!");
}
}
function execute_sql($sql, $params=[])
{
global $conn;
if ($conn == null)
init_sql();
try
{
$stmt = $conn->prepare($sql);
$stmt->execute($params);
$data = array();
if ($stmt->columnCount() == 0) //INSERT / UPDATE
return $stmt->rowCount();
while ($row = $stmt->fetch(PDO::FETCH_ASSOC))
$data[] = $row;
return $data;
}
catch(Exception $e)
{
die("somting glitched. error is: $e");
}
}
?>
maybe, there is problem with my localhost, which is localhost:8080/phpmyadmin
also here is picture of database