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PHP CRUD Operations with PHP Creating Records Reading Project Data

Won't display error message on site

Im using my own DB in phpmyadmin But this won't display any error messages on my site if i change any table names Is there a typo im missing or mysql as a different getMessage() function?

function get_project_list() {
    include 'db.php';
    try {
        return $conn->query("SELECT project_id, title, category FROM projects");
    } catch(Exception $e) {
        echo "Error!: " . $e->getMessage() . "</br>";
        return false;
    }

}