simple syntax error here?

[tk403]

SOLVED, THANK YOU

I put together a small php script within an HTML page, and I'm getting a bunch of the PHP code showing up on the HTML page, which makes me assume I have a syntax error or stray quotes somewhere. But I can't seem to figure out my mistake. Attached is a screenshot of the HTML output, below is the code. Thanks for any suggestions.

    <?php
    
        if (isset($_POST['createTable'])) {
            //create initial table    
            echo "<table>";
            //set variables from form input
            $rows = $_POST['rows'];
            $columns = $_POST['columns'];
            //loop to create rows
            for ($r = 1; $r <= $rows; $r++) {
                echo "<tr>";
                //loop to create columns
                for ($c = 1; $c <= $columns; $c++) {
                    echo "<td>&nbsp;</td>";
                }
                echo "</tr>";
            }
            echo "</table>";
        }
        
    ?>