带有PostGreSQL的PHP session_start无法在其他页面上运行

I am trying to use sessions to store information to be able to access on other pages with PHP.

I have done this several times with MySQL and it works perfectly, however with PostGreSQL it doesn't seem to work anywhere other than on the page created.

Here is a very simple example I tried to make and this doesn't even work (if you swap the psql for mysql - the below code works):

index.php:

<?php
    include_once("connection.php");
?>
<!DOCTYPE HTML>
<html>
    <head>
        <title>Index</title>
    </head>
    <body>
        <div class="container">
            <p>hello</p>
            <form method="post" action="">
                <input type="text" name="name">
                <input type="submit" name="submit" value="Submit">              
            </form>
        </div>
    </body>
</html>

test.php:

<?php
    include_once("connection.php");

    $username = $_SESSION['name'];
?>
<!DOCTYPE HTML>
<html>
    <head>
        <title>Index</title>
    </head>
    <body>
        <div class="container">
            <?php echo '<p> Hello ' . $username .'</p>';
            ?>
        </div>
    </body>
</html>

Connection.php:

<?php

    $conn_data = ("host=cimteaching1 port=27005 dbname='enter name' user='enter username' password='enter password'");
    $dbconn = pg_connect($conn_data) or die("Cannot connect to db" . pg_last_error());



    if(isset($_POST['submit'])) {
         $name = $_POST['name'];
         session_start();
         $_SESSION['name'] = $name;
         header("Location: test.php");
    }
?>

带有PostGreSQL的PHP​​ session_start无法在其他页面上运行

带有PostGreSQL的PHP session_start无法在其他页面上运行