无法使用Smarty从PHP代码创建TPL函数

Question

I have created a function to run an SQL query, output the data and that seems fine, Problem is I can't do anything with it now since i can't make the output to the templates work.

PHP Code:

 function getCategories() {
    try {
        foreach($this->pdo->query("SELECT categories.cat_id, categories.cat_name, categories.cat_description FROM categories") as $row) {
            $rows[] = $row;
        }
    } catch(PDOException $e) {
        print "Error!:" . $e->getMessage();
        return false;
    }
    return $rows;
    $smarty = new Smarty();
    $smarty->assign('categories', $rows);
}

Which simply returns this:

Replacing return $rows; with return $smarty->assign('categories', $rows); simply renders a blank page.

I'm using this in the template: {$categories.cat_name}

Can anyone help me fix this?

I'm trying to rewrite a vulnerable crappy forum script using Smarty so it's a base worth trying to develop a script off of. It's literally just categories, topics and a login / register system atm that I'm trying to rewrite using Smarty.

Answer 1

The problem is that you create a new smarty object, assign it a variable, but doesn't use it to display your template - so this object get lost.

I suggest to pass the Smarty object to your function like this:

function getCategories(&$smarty) {
    $rows = array();
    if($result = $this->pdo->query("SELECT categories.cat_id, categories.cat_name, categories.cat_description FROM categories")) {
        $rows = $result->fetchAll();
    }
    $smarty->assign('categories', $rows);
}

This way the object reference will be passed to the function - you will be able to assign any vars you want to it without the need of returning it. Just be sure that you send the Smarty object you use to render the template.