WordPress - Fatal error: Call to a member function when calling class

Question

I have created a php class in my theme function.php

class myWidgetSetting {

    function get_title(){
     //some blah blah code
    }

}

$setting = new myWidgetSetting();

but when I call this class $setting->get_title() inside:

class myWidget extends WP_Widget { 
    function renderLayout(){
    global $setting;
            $setting->get_title();
    }
}

Then I get this error:

Fatal error: Call to a member function get_title() on a non-object in D:\\wamp\\www\\wp-content\\themes\\twentyten\\widgets\\myWidget.php on line 3

Do i need to register class to wordpress ??

Answer 1

I'm not expert on PHP but to use $setting variable as global you need to declare it as such.

Like this:

global $setting;
$setting = new myWidgetSetting();