简单的标签云实现

实现代码：

function _cloudHtml($data = array(), $minFontSize = 12, $maxFontSize = 30)
{
    $minimumCount = min(array_values($data));
    $maximumCount = max(array_values($data));
    $spread = $maximumCount - $minimumCount;
    $cloudHTML = '';
    $cloudTags = array();
    $spread == 0 && $spread = 1;
    foreach ($data as $tag => $count)
    {
        $size = $minFontSize + ($count - $minimumCount)
                        * ($maxFontSize - $minFontSize) / $spread;
        $cloudTags[] = '<a style="font-size: ' . floor( $size ) . 'px"'
                . ' href="tag.php?name=' . rawurlencode($tag) . '"'
                . ' title="' . $tag . ' (' . $count . ')">'
                . htmlspecialchars(stripslashes( $tag)) . '</a>';
    }
    return join( "\n", $cloudTags ) . "\n";
}

调用代码：

function _tagCloud()
{
    $sql = "select tag, count(1) as count from tbs_tags group by tag";
    $rows = $this->db->getAll($sql);
    foreach ($rows as $row)
    {
        $tags[$row['tag']] = $row['count'];        
    }
    return $this->_cloudHtml($tags, 12, 24);
}