By pjohn on

Hello! I'm relatively new to Drupal and am trying to alter the output from an existing module (Advanced Forum) without hacking the module. The function I'm trying to override is advanced_forum_theme_image(), which is called several times from within the module. Of course I want to do this from my own module without hacking Advanced Forum. I guess my questions are two:

1) Is advanced_forum_theme_image() an implementation of some hook function? How would I know?
2) If so, how do I intercept it? If not, is it even possible to intercept it?

As usual with Drupal, I'm unsure if I'm even asking the right questions. I am a pretty solid PHP programmer, but not knowing what is calling what and when within Drupal always gives me nightmares. :) Many thanks for any help.

⋅ Categories: Drupal 7.x

Comments

vm’s picture

vm commented

the function you pasted sbove calls the theme wrapper. = http://api.drupalhelp.net/api/advanced_forum/advanced_forum.module/funct...

what are you trying to accomplish, by altering that function?

theme functions tend to start with the word theme.

function theme_feed_icon($variables) {
  $text = t('Subscribe to @feed-title', array('@feed-title' => $variables['title']));
  if ($image = theme('image', array('path' => 'misc/feed.png', 'width' => 16, 'height' => 16, 'alt' => $text))) {
    return l($image, $variables['url'], array('html' => TRUE, 'attributes' => array('class' => array('feed-icon'), 'title' => $text)));
  }
}

the word theme is the altered to the reflect the name of the theme in use.

function MYTHEME_feed_icon($variables) {
  $text = t('Subscribe to @feed-title', array('@feed-title' => $variables['title']));
  if ($image = theme('image', array('path' => 'misc/feed.png', 'width' => 16, 'height' => 16, 'alt' => $text))) {
    return l($image, $variables['url'], array('html' => TRUE, 'attributes' => array('class' => array('feed-icon'), 'title' => $text)));
  }
}

the new function is placed in template.php and the cache cleared.

pjohn’s picture

pjohn commented

I figured it out... sorry I haven't let you all know before now. I was trying to override how the Advanced Forum module was theming images. What I had to do was use the MYMODULE_theme_registry_alter() function and add a reference to my own theming function. Thanks for your help!

function MYMODULE_theme_registry_alter(&$theme_registry) {
	if (!empty($theme_registry['image']['function'])) {
		$theme_registry['image']['function'] = 'MYMODULE_theme_image';
	}
}
SGhosh’s picture

SGhosh commented

Thanks. That was the solution even I was looking for! :)