这是我的代码:
class Subscriber extends DatabaseObject {
protected static $table_name = "email_list";
protected static $db_fields = array('id', 'email');
public $id;
public $email;
function __construct() {
self::$object = new Subscriber;
}
}
在父类中,DatabaseObject
问题是:
class DatabaseObject {
protected static $object;
protected static $db_fields;
protected function attributes() {
$attributes = array();
foreach (self::$db_fields as $field) {
// edited
}
return $attributes;
}
但是,我得到Warning: Invalid argument supplied for foreach()
了因为这条线:
foreach (self::$db_fields as $field) {
为什么没有设置数组?我尝试constructor
手动设置它,但它也不起作用。