Data dropdown not loaded with mysql - php

Question

function query(){
$leverancierVar = mysql_query("SELECT * FROM leverancier");
while($record = mysql_fetch_array($leverancierVar)){
echo '<option value="' . $record['leverancier'] .'">' . $record['leverancier'] . '</option>';
}
}
this is my code to store all data in database in function
<select id="leverancier" name="leverancier" style="width: 30%">
<?php query() ?>
</select>
this is the line of code i am using in the form to load data
[Database screenshot][1]
When I click the form dropdown button, there is no data displayed.
I am trying to solve the issue for a few hours, maybe someone with a clear look can see the mistake I made.
Edit:
I managed to get the data from the database, and displayed in a the dropdown, however the text is not displayed in the dropdown. You can however choose a value, and the correct value will be saved in the database. Here is a picture of the problem
And here's the code I used:
<?php
$mysqli = new mysqli("localhost", "root", "", "voorraad");
$result = $mysqli->query("SELECT leverancier from leverancier");
echo "<select id='leverancier' name='leverancier' style='width: 30%', color='black'>";
while ($row = mysqli_fetch_array($result)) {
echo "<option value='" . $row['leverancier'] ."'></option>";
}
echo "</select>";
?>

Answer 1

I imagine you're not connected to the database, probably worth looking over the connection page in the PHP manual
In the manual you will probably notice some warnings about the mysql_* extension. That is because it is deprecated and removed in version 7 and above. What does that mean for you? Essentially you shouldn't be using the mysql_* extension in your code.
You should instead use mysqli or PDO
If you were going to use PDO you would connect like so:
$dsn = 'mysql:dbname=<DATABASENAME>;host=<HOSTADDRESS>';
$user = ''; // Database User
$password = ''; // Database Password.
try {
$connection = new PDO($dsn, $user, $password);
} catch (PDOException $e) {
// Connection failed, you may want to do something here
}
And then do your query like so:
$statement = $connection->prepare('SELECT * FROM leverancier');
$statement->execute(); // Run the query.
$result = $statement->fetchAll(PDO::FETCH_ASSOC);
foreach ($result as $row) {
echo '<option value="' . $record['leverancier'] .'">' . $record['leverancier'] . '</option>';
}