访问__get（）魔术方法返回的数组的索引

Question

I am trying to use the magic method __get() with a class in order to access a private property. The property is not assigned a value unless it is accessed, and that value is an array which is indexed from 0.

class Foo {
    private $bar;

    public function __get($p) {
        if ($p == 'bar') {
            if ($this->bar) {
                return $this->bar;
            }
            else {
                return $this->bar = $this->get_bar();
            }
        }
    }

    private function get_bar() {
        return Array('a', 'b', 'c');    // data from db
    }
}

In my PHP code, I am instantiating an object of this class, and passing it directly to Smarty (ie $smarty->assign('obj', new Foo()) ). I would like to access the value at index 0 from the $bar property within my template file. I have tried this:

    {$obj->bar[0]}

However, this is not returning anything for me... Is this something that is not supported by the data returned by this magic method?

Answer 1

Sorry everyone!

My problem was that, in the actual code, I was trying to access an array element which was actually embedded in an array one level deeper.

I was going to delete this question, however I feel as though it will be a good reference to demonstrate that an array returned by a magic method in this manner can be accessed with the standard subscript operator, even within a Smarty template.

Answer 2

You cannot use $smarty->assign() to assign objects, assign() only accepts associative arrays and name value pairs. Use assign_by_ref() instead to send objects to your template.

PHP/Smarty Example

$foo = new Foo();
$smarty->assign_by_ref('obj', $foo);

Template Example/Useage

{$obj->bar[0]}