使用来自 PHP 的查询填充 HTML 元素

Question

I want to make the html element

<p id="userInfo"></p>

have the value of the username that was user to login in the session. I have the following variable set to contain the variable that holds the username and works this works for logging in.

$_SESSION['globalUser'] = $_POST['resultUser'];

I currently am attempting to set the userInfo element with

<script>document.getElementById(userInfo).value='<?php echo $_SESSION['globalUser']?>'</script>

This script is causing the error "Uncaught SyntaxError: Invalid or unexpected token"

When I open the developer tools and click the error it shows

<script>document.getElementById(userInfo).value='<br />

I also using the following statement to transfer the session across pages

<?php $session_value=(isset($_SESSION['id']))?$_SESSION['id']:''; ?>

What am I doing wrong here?

EDIT:

This is currently my query

$sqlUser = "SELECT `teacher_username` FROM `teacher` WHERE `teacher_username`='$user'";
$sqlPass = "SELECT `password` FROM `teacher` WHERE `password`='$pass'";
$resultUser = mysqli_query($connection, $sqlUser);
$resultPass = mysqli_query($connection, $sqlPass);
$textUser = $resultUser->fetch_assoc();
$textPass = $resultPass->fetch_assoc();
$_SESSION['globalUser'] = $_POST[$textUser['teacher_username']];

Answer 1

You need to quote the ID userinfo , otherwise it will be used as a variable rather than a literal.

You should assign to innerText rather than value ; only user input elements have a value.

To convert PHP values to JavaScript literals, the safest way is to use json_encode() . It will add quotes and any necessary escaping.

<script>document.getElementById('userInfo').innerText=<?php echo json_encode($_SESSION['globalUser']); ?>;</script>