使用h1到h6从数组中生成标签云的最佳方式是什么？
我有以下数组：
$artist = array("the roots", "michael jackson", "billy idol", "more", "and more", "and_YET_MORE"); $count = array(5, 3, 9, 1, 1, 3); 我想要生成一个标签云，其中包含h6标签中封闭的h1标签中包含更高数字的艺术家。
你也会想添加一个对数函数。 （取自tagadelic，我的Drupal模块创build标签云http://drupal.org/project/tagadelic ）：
db_query('SELECT COUNT(*) AS count, id, name FROM ... ORDER BY count DESC'); $steps = 6; $tags = array(); $min = 1e9; $max = -1e9; while ($tag = db_fetch_object($result)) { $tag->number_of_posts = $tag->count; #sets the amount of items a certain tag has attached to it $tag->count = log($tag->count); $min = min($min, $tag->count); $max = max($max, $tag->count); $tags[$tag->tid] = $tag; } // Note: we need to ensure the range is slightly too large to make sure even // the largest element is rounded down. $range = max(.01, $max - $min) * 1.0001; foreach ($tags as $key => $value) { $tags[$key]->weight = 1 + floor($steps * ($value->count - $min) / $range); }
然后在您的视图或模板中：
foreach ($tags as $tag) { $output .= "<h$tag->weight>$tag->name</h$tag->weight>" }
closures我的头顶…
$artist = array("the roots","michael jackson","billy idol","more","and more","and_YET_MORE"); $count = array(5,3,9,1,1,3); $highest = max($count); for (int $x = 0; x < count($artist); $x++) { $normalized = $count[$x] / $highest; $heading = ceil($normalized * 6); // 6 heading types echo "<h".$heading.">".$artist[$x]."</h".$heading.">"; }
也许这是一个有点学术的话题，但是由于文档结构等原因， hX标签可能不是标签云的最佳select。
也许span或s与适当的类属性（加上一些CSS）？
已经使用了这段代码片刻，信用是prism-perfect.net。 尽pipe不使用H标签
<div id="tags"> <div class="title">Popular Searches</div> <?php // Snippet taken from [prism-perfect.net] include "/path/to/public_html/search/settings/database.php"; include "/path/to/public_html/search/settings/conf.php"; $query = "SELECT query AS tag, COUNT(*) AS quantity FROM sphider_query_log WHERE results > 0 GROUP BY query ORDER BY query ASC LIMIT 10"; $result = mysql_query($query) or die(mysql_error()); while ($row = mysql_fetch_array($result)) { $tags[$row['tag']] = $row['quantity']; } // change these font sizes if you will $max_size = 30; // max font size in % $min_size = 11; // min font size in % // get the largest and smallest array values $max_qty = max(array_values($tags)); $min_qty = min(array_values($tags)); // find the range of values $spread = $max_qty - $min_qty; if (0 == $spread) { // we don't want to divide by zero $spread = 1; } // determine the font-size increment // this is the increase per tag quantity (times used) $step = ($max_size - $min_size)/($spread); // loop through our tag array foreach ($tags as $key => $value) { // calculate CSS font-size // find the $value in excess of $min_qty // multiply by the font-size increment ($size) // and add the $min_size set above $size = $min_size + (($value - $min_qty) * $step); // uncomment if you want sizes in whole %: // $size = ceil($size); // you'll need to put the link destination in place of the /search/search.php... // (assuming your tag links to some sort of details page) echo '<a href="/search/search.php?query='.$key.'&search=1" style="font-size: '.$size.'px"'; // perhaps adjust this title attribute for the things that are tagged echo ' title="'.$value.' things tagged with '.$key.'"'; echo '>'.$key.'</a> '; // notice the space at the end of the link } ?> </div>
@Ryan
这是正确的，但它实际上使标签数量最less，规模更大。 此代码已经过testing：
$artist = array("the roots","michael jackson","billy idol","more","and more","and_YET_MORE"); $count = array(5,3,9,1,1,3); $highest = max($count); for ($x = 0; $x < count($artist); $x++) { $normalized = ($highest - $count[$x]+1) / $highest; $heading = ceil($normalized * 6); // 6 heading types echo "<h$heading>{$artist[$x]}</h$heading>"; }
这个方法是针对SQL/PostgreSQL狂热者。 它在数据库中完成整个工作，并用“slugified”链接打印文本。 它使用Doctrine ORM仅用于sql调用，我没有使用对象。 假设我们有10个尺寸：
public function getAllForTagCloud($fontSizes = 10) { $sql = sprintf("SELECT count(tag) as tagcount,tag,slug, floor((count(*) * %d )/(select max(t) from (select count(tag) as t from magazine_tag group by tag) t)::numeric(6,2)) as ranking from magazine_tag mt group by tag,slug", $fontSizes); $q = Doctrine_Manager::getInstance()->getCurrentConnection(); return $q->execute($sql); }
那么你用一些CSS类打印它们，从.tagranking10（最好）到.tagranking1（最差）：
<?php foreach ($allTags as $tag): ?> <span class="<?php echo 'tagrank'.$tag['ranking'] ?>"> <?php echo sprintf('<a rel="tag" href="/search/by/tag/%s">%s</a>', $tag['slug'], $tag['tag'] ); ?> </span> <?php endforeach; ?>
这是CSS ：
/* put your size of choice */ .tagrank1{font-size: 0.3em;} .tagrank2{font-size: 0.4em;} .tagrank3{font-size: 0.5em;} /* go on till tagrank10 */
这个方法显示所有的标签。 如果你有很多，你可能不希望你的标签云成为标签风暴 。 在这种情况下，你可以在你的SQL查询中附加一个HAVING TO子句：
-- minimum tag count is 8 -- HAVING count(tag) > 7
就这样
作为Rails的帮手：
def tag_cloud (strings, counts) max = counts.max strings.map { |a| "<span style='font-size:#{((counts[strings.index(a)] * 4.0)/max).ceil}em'>#{a}</span> " } end
从视图中调用：
<%= tag_cloud($artists, $counts) %>
这将在数组中输出<span style='font-size:_em'>元素，该元素将被转换为视图中的string以最终呈现如下所示：
<span style='font-size:3em'>the roots</span> <span style='font-size:2em'>michael jackson</span> <span style='font-size:4em'>billy idol</span> <span style='font-size:1em'>more</span> <span style='font-size:1em'>and more</span> <span style='font-size:2em'>and_YET_MORE</span>
如上面Brendan所提到的那样，最好有一个class属性并引用样式表中的类。 比使用h1-h6语义更好，并且带有<span>样式行李更less。
我知道它的老post。 张贴我的观点，因为它可能有助于未来的人。
这里是我在我的网站http://www.vbausefulcodes.in/中使用的tagcloud
<?php $input= array("vba","macros","excel","outlook","powerpoint","access","database","interview questions","sendkeys","word","excel projects","visual basic projects","excel vba","macro","excel visual basic","tutorial","programming","learn macros","vba examples"); $rand_tags = array_rand($input, 5); for ($x = 0; $x <= 4; $x++) { $size = rand ( 1 , 4 ); echo "<font size='$size'>" . $input[$rand_tags[$x]] . " " . "</font>"; } echo "<br>"; $rand_tags = array_rand($input, 7); for ($x = 0; $x <= 6; $x++) { $size = rand ( 1 , 4 ); echo "<font size='$size'>" . $input[$rand_tags[$x]] . " " . "</font>"; } echo "<br>"; $rand_tags = array_rand($input, 5); for ($x = 0; $x <= 4; $x++) { $size = rand ( 1 , 4 ); echo "<font size='$size'>" . $input[$rand_tags[$x]] . " " . "</font>"; } ?>
