[theme-reviewers] Question about ob_start and ob_get_clean (Vicky Arulsingam)

[scribu]

On Sun, Jul 3, 2011 at 4:08 AM, Chip Bennett <chip at chipbennett.net> wrote:

> 1) Anything hooked in using *wp_enqueue_style()* or *wp_enqueue_script()*can be undone by calling
> *wp_dequeue_style()* and *wp_dequeue_script()*, respectively.
>
> 2) Anything hooked in using *add_action( 'wp_head', 'some_custom_function'
> )* can be undone by calling *remove_action( 'wp_head',
> 'some_custom_function' )*
>
>
> Am I missing any options? Are there any other ways for Plugins to inject
> content into the HTML document head?
>

(Playing devil's advocate here) I can think of a case where remove_action()
could not be used:

class My_Class {
  function __construct() {
    add_action( 'wp_head', array( $this, 'output_some_html' ) );
  }
}

new My_Class;

Since you can't get to the instance of My_Class, you can't unhook it.

Even if the last line read:

$GLOBALS['my_class'] = new My_Class;

remove_action() still won't work:
http://core.trac.wordpress.org/ticket/10535

That's why I use static methods:

class My_Class {
  static function init() {
    add_action( 'wp_head', array( __CLASS__, 'output_some_html' ) );
  }
}

My_Class::init();

Then you could confidently call remove_action( 'wp_head', array( 'My_Class',
'output_some_html' ) );


-- 
http://scribu.net
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