Show Description for Header Images in Twenty Eleven

This code is for a child theme of Twenty Eleven, because the direct editing of the default theme is not recommended.

Since wp3.4, the function get_custom_header() takes care of some of the information of the header images, such as width, height, and also the description or attachment id.

If added in header.php of the child theme, before:

<?php endif; // end check for removed header image ?>

the code below extracts the description information and outputs it below the header image:

<?php 
if ( function_exists( 'get_custom_header' ) && is_child_theme() ) :
if( get_custom_header()->description ) {
$header_description = get_custom_header()->description;
} elseif ( is_singular() && has_post_thumbnail( $post->ID ) && ( /* $src, $width, $height */ $header_img = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), array( $header_image_width, max($header_image_width,$header_image_height) ) ) ) && $header_img[1] >= $header_image_width ) {
$header_img_details = get_posts(array('p' => get_post_thumbnail_id( $post->ID ), 'post_type' => 'attachment'));
$header_description = $header_img_details[0]->post_content;
} elseif( $att_id = get_custom_header()->attachment_id ) { 
$header_img_details = get_posts(array('p' => $att_id, 'post_type' => 'attachment'));
$header_description = $header_img_details[0]->post_content;
} 
if( $header_description ) echo '<span class="header-description">' . $header_description . '</span>'; 
endif; 
?>

A commented version of the code is in pastebin http://pastebin.com/VbjxyMRF .

Advanced Filter for Tag Cloud Widget Css Classes

tag cloud widget colored with css
tag cloud widget advanced color styling

The default tag cloud widget does not offer a lot of formatting possibilities, partly because it only outputs one css class with a reference to the tag ID.
It uses an inline style, which outputs the font-size, to distinguish the tags according the number of post they belong to.

This filter function is coded to add a css class with the tag slug .tag-slug-{slug} and with a rounded tag size .tag-size-{number}, and to remove the inline style.

add_filter ( 'wp_tag_cloud', 'tag_cloud_widget_advanced_classes' );  

function tag_cloud_widget_advanced_classes( $taglinks ) { 
	$tags = explode('</a>', $taglinks);
	$regex1 = "#(.*tag-link[-])(.*)(' title.*)#e";         
	$regex2 = "#(.*style='font-size:)(.*)((pt|px|em|pc|%);'.*)#e"; 
	$regex3 = "#(style='font-size:)(.*)((pt|px|em|pc|%);')#e";         
	$regex4 = "#(.*class=')(.*)(' title.*)#e";         
	foreach( $tags as $tag ) {         
		$tag = preg_replace($regex1, "('$1$2 tag-slug-'.get_tag($2)->slug.'$3')", $tag ); //add .tag-slug-{slug} class   
		$size = preg_replace($regex2, "(''.round($2).'')", $tag ); //get the rounded font size       
		$tag = preg_replace($regex3, "('')", $tag ); //remove the inline font-size style
		$tag = preg_replace($regex4, "('$1tag-size-'.($size).' $2$3')", $tag ); //add .tag-size-{nr} class
		$tagn[] = $tag;
	}     
	$taglinks = implode('</a>', $tagn);     
return $taglinks; 
}

For the code, also see the pastebin.

The added css classes can for instance be used to color the tags according to the number of appearance; as you can see here in the tag cloud when you scroll down on the left.