Remove action from shortcode

Question

There is add_action() function inside function which is callback for add_shortcode(). Any idea how to remove this action with the help of custom plugin? Should I hook to any action which is called later then add_shortcode() function? I do not want to removing and re-adding shortcode, because there is huge function beyond it.

Simple example:

function test_shortcode() {
  ... other code ...
  add_action( 'some_hook', 'custom_function');
  ... other code ...
}

add_action( 'wp_head', 'setup_theme' );
function setup_theme() {
  ... other code...
  add_shortcode( 'test', 'test_shortcode' );
  ... other code ...
}

I need to remove custom_function() from this shortcode.

Thank you for your help...

Answer 1

I do not want to removing and re-adding shortcode, because there is huge function beyond it.

This might not answer your question, but the size of the shortcode function itself does not make much of a difference for removing and re-adding. Short or long functions take the same time here.

So don't hinder yourself removing the shortcode (remove_shortcode) because of the size of the function (huge), just remove it if you want to remove it, regardless how big it is:

remove_shortcode('test');

Answer 2

Have you considered remove_action( 'some_hook', 'custom_function');?

Answer 3

OK, I found a way. Function add_shortcode is called for the_content filter with priority 11 (after wpautop). So, to remove custom_function() has to be done with the help of this filter (also with priority 11). Solution?

add_filter( 'the_content', 'unhook_custom_function', 11 );
function unhook_custom_function( $content ) {
  remove_action( 'some_hook', 'custom_function' );
  return $content;
}

Works well for me. Thank you all for ideas!

Answer 4

Found the code bellow on https://gist.github.com/1887242

if ( ! function_exists( 'shortcode_exists' ) ) :
/**
 * Check if a shortcode is registered in WordPress.
 *
 * Examples: shortcode_exists( 'caption' ) - will return true.
 *           shortcode_exists( 'blah' )    - will return false.
 */
function shortcode_exists( $shortcode = false ) {
    global $shortcode_tags;

    if ( ! $shortcode )
        return false;

    if ( array_key_exists( $shortcode, $shortcode_tags ) )
        return true;

    return false;
}
endif;

Seems like it does the job ;-)