Question

Using the following:

$last_book = tz_books::getLast($request->db, "WHERE book_id='{$request->book_id}'");

I get the following php object array,

[0] => tz_books Object
    (
        [db:tz_books:private] => com Object

        [id] => 64BEC207-CA35-4BD2
        [author_id] => 4F4755B4-0CE8-4251
        [book_id] => 8FC22AA0-4A60-4BFC
        [date_due] => variant Object

    )

I then want to use the author_id, but for some reason it’s not working.

Trying to use:

$tz_books->author_id;

Using print_r($last_book); prints the array to the console just fine. And Doing the following just to see if the correct variable was being used:

$author = $tz_books->author_id;
print_r($author);

Nothing is printed to the console, and even after digging through the php manual and trying a lot of alternatives, I can’t seem to grab that variable. I’m hoping i’m making a rookie mistake and overlooking something stupid. Thank you for any help!

Edit: Class definition

private $db;
public $id;
public $author_id;
public $book_id;
public $date_due;

public function __construct($db, $values=null) {
    $this->db = $db;
    if ( $values != null ) {
        foreach ( $values as $var => $value ) {
            $this->$var = $value;
        }
    }
}

public static function retrieveAll($db, $where='', $order_by='') {
    $result_list = array();
    $query = 'SELECT '.
            'id, '.
            'author_id, '.
            'book_id, '.
            'date_due '.
        "FROM tz_books $where $order_by";

    $rs = $db->Execute($query);

    while ( !$rs->EOF ) {
        $result_list[] = new tz_books($db, array(
            'id' => clean_id($rs->Fields['id']->Value),
            'author_id' => clean_id($rs->Fields['author_id']->Value),
            'book_id' => clean_id($rs->Fields['book_id']->Value),
            'date_due' => $rs->Fields['date_due']->Value,
        ));
        $rs->MoveNext();
    }
    $rs->Close();
    return $result_list;
}

Answer 1

Your result object seems to be an array of books with 1 element.
Try

echo $tz_books[0]->author_id;

BTW, it also looks like you’re escaping input by putting single quotes. This is not a reliable/recommended method. Use a database-specific escape function like this