Collection of usefull snippets for the functions.php

functions.php

// adding blogname to body_class(), 
// see http://www.be-studios.com/blog/2012/11/wordpress-multisite-adding-blogname-to-body_class/

add_filter('body_class', 'multisite_body_classes');
function multisite_body_classes($classes) {
   $id = get_current_blog_id();
   $slug = strtolower(str_replace(' ', '-', trim(get_bloginfo('name'))));
   $classes[] = $slug;
   $classes[] = 'site-id-'.$id;
   return $classes;
}

// unautop for images, 
// see http://wpengineer.com/2264/replace-p-tag-on-images-in-content-of-wordpress/
function fb_unautop_4_img( $content ) {
$content = preg_replace(
'/<p>\\s*?(<a rel=\"attachment.*?><img.*?><\\/a>|<img.*?>)?\\s*<\\/p>/s',
'<figure>$1</figure>',
$content
);
return $content;
}
add_filter( 'the_content', 'fb_unautop_4_img', 99 );