<?php
    header('Content-Type: application/json');
    include("connectdb.php");

    $db = connectdb();

    $coursename = $_POST["coursename"];

    $query = <<<EOF
select course_credits from courses where course_name='$coursename';
EOF;
    $qres = pg_query($db, $query);
    $res = pg_fetch_row($qres)[0];

    echo json_encode($res);
?>