getData

<?php

function getData($value)
{
    $sql = "
    SELECT id, artiest
    FROM artiesten
    WHERE sort='".$value."'
    ORDER BY artiest
    ";

    $result = mysqli_query($con, $sql);

    $data = array();

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

        $data[] = $row;
    }

    return $data;
}

$a = getData('a');
$b = getData('b');
$c = getData('c');

?>