Site upgrade, Wordpress 2.3.1, Tags
So, I’ve finally upgraded this site to use a version 2.x series Wordpress. This version (2.3.1) includes tagging support built in, which was a big plus for me as I’d be looking at installing something like UTW, but putting it off because I knew I planned to upgrade. Installation/upgrade of Wordpress is impressively straightforward by the way.
Anyway, after going through and tagging most of my entries, it was clear that I had a small number of tags with like 20 posts, and then lots of others with 1-5, which meant I had a list of words with a couple of them highlighted, but unable to see the difference between a tag with 1 post and one with 4. Luckily, I know PHP. 
The code below replaces the wp_generate_tag_cloud function in the wp-includes/category-template.php file. Essentially, rather than taking the default distribution of number of posts for a tag then calculating the size, it takes the natural log (aka ln or loge), which results in a more even distribution, and so more similarly sized tags!
This code was marked up using the wonderful GeSHi.
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function wp_generate_tag_cloud( $tags, $args = ” ) {
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global $wp_rewrite;
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’smallest’ => 8, ‘largest’ => 22, ‘unit’ => ‘pt’, ‘number’ => 45,
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‘format’ => ‘flat’, ‘orderby’ => ‘name’, ‘order’ => ‘ASC’
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);
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$args = wp_parse_args( $args, $defaults );
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if ( !$tags )
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return;
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$counts_display[$tag->name] = $tag->count;
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$tag_links[$tag->name] = get_tag_link( $tag->term_id );
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if ( is_wp_error( $tag_links[$tag->name] ) )
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return $tag_links[$tag->name];
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$tag_ids[$tag->name] = $tag->term_id;
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}
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if ( $spread <= 0 )
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$spread = 1;
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$font_spread = $largest - $smallest;
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if ( $font_spread <= 0 )
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$font_spread = 1;
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$font_step = $font_spread / $spread;
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// SQL cannot save you; this is a second (potentially different) sort on a subset of data.
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if ( ‘name’ == $orderby )
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else
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if ( ‘DESC’ == $order )
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foreach ( $counts as $tag => $count ) {
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$tag_id = $tag_ids[$tag];
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$tag_link = clean_url($tag_links[$tag]);
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$a[] = "<a href=’$tag_link’ class=’tag-link-$tag_id’ title=’" . attribute_escape( sprintf( __(‘%d topics’), $counts_display[str_replace(‘ ’,‘ ‘,$tag)] ) ) . "’$rel style=’font-size: " .
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( $smallest + ( ( $count - $min_count ) * $font_step ) )
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. "$unit;’>$tag</a>";
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}
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switch ( $format ) :
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case ‘array’ :
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$return =& $a;
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break;
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case ‘list’ :
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$return = "<ul class=’wp-tag-cloud’>\n\t<li>";
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$return .= "</li>\n</ul>\n";
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break;
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default :
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break;
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endswitch;
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return apply_filters( ‘wp_generate_tag_cloud’, $return, $tags, $args );
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}
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