search partner topics display functions

<?php
$con = mysqli_connect("localhost","root"," ","social_media") or die ("Connection was not established");
?>

//function for getting topics

function getTopics(){

global $con;

$get_topics= "select * from topics";

$run_topics = mysqli_query($con,$get_topics);

while($row=mysqli_fetch_array($run_topics)){

$topic_id = $row['topic_id'];
$topic_name = $row['topic_name'];
echo "<option value='$topic_id'>$topic_name</option>";
}



}