February 12, 2011 
Definition:
function wp_tag_cloud( $args = '' ) {}
Display tag cloud.
The text size is set by the ‘smallest’ and ‘largest’ arguments, which will use the ‘unit’ argument value for the CSS text size unit. The ‘format’ argument can be ‘flat’ (default), ‘list’, or ‘array’. The flat value for the ‘format’ argument will separate tags with spaces. The list value for the ‘format’ argument will format the tags in a UL HTML list. The array value for the ‘format’ argument will return in PHP array type format.
Parameters
- array|string $args: Optional. Override default arguments.
Return values
returns:Generated tag cloud, only if no failures and ‘array’ is set for the ‘format’ argument.
Defined filters
- wp_tag_cloud
apply_filters( 'wp_tag_cloud', $return, $args )
Source code
function wp_tag_cloud( $args = '' ) {
$defaults = array(
'smallest' => 8, 'largest' => 22, 'unit' => 'pt', 'number' => 45,
'format' => 'flat', 'separator' => "\n", 'orderby' => 'name', 'order' => 'ASC',
'exclude' => '', 'include' => '', 'link' => 'view', 'taxonomy' => 'post_tag', 'echo' => true
);
$args = wp_parse_args( $args, $defaults );
$tags = get_terms( $args['taxonomy'], array_merge( $args, array( 'orderby' => 'count', 'order' => 'DESC' ) ) ); // Always query top tags
if ( empty( $tags ) || is_wp_error( $tags ) )
return;
foreach ( $tags as $key => $tag ) {
if ( 'edit' == $args['link'] )
$link = get_edit_tag_link( $tag->term_id, $tag->taxonomy );
else
$link = get_term_link( intval($tag->term_id), $tag->taxonomy );
if ( is_wp_error( $link ) )
return false;
$tags[ $key ]->link = $link;
$tags[ $key ]->id = $tag->term_id;
}
$return = wp_generate_tag_cloud( $tags, $args ); // Here's where those top tags get sorted according to $args
$return = apply_filters( 'wp_tag_cloud', $return, $args );
if ( 'array' == $args['format'] || empty($args['echo']) )
return $return;
echo $return;
}
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