我有以下数组：
$artist = array("the roots", "michael jackson", "billy idol", "more", "and more", "and_YET_MORE");
$count = array(5, 3, 9, 1, 1, 3);
我想生成一个标签云，其中包含标签中数字较高的艺术家和$count封闭h6标签中数字最少的艺术家h1。
dubayou
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8725 次
8 回答
41
您还需要向其添加对数函数。（取自我的 Drupal 模块 tagadelic，用于创建标签云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>"
}
于 2010-05-31T11:53:57.940 回答
32
从我的头顶上...
$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.">";
}
于 2008-08-01T23:10:56.510 回答
26
也许这有点学术和离题，但hX由于文档结构和所有类似的原因，标签可能不是标签云的最佳选择。
也许spans 或 anol具有适当的类属性（加上一些 CSS）？
于 2008-08-03T13:01:24.243 回答
9
已经使用这个片段一段时间了，信用是 prism-perfect.net。虽然不使用 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>
于 2008-09-17T21:29:41.770 回答
7
@瑞安
这是正确的，但它实际上使数量最少的标签更大。此代码已经过测试：
$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>";
}
于 2008-08-01T23:58:35.650 回答
2
此方法适用于SQL/PostgreSQL狂热分子。它在数据库中完成整个工作，并打印带有“slugified”链接的文本。它ORM仅将 Doctrine 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);
}
然后你用一些 CSS 类打印它们，从 .tagranking10 （最好的）到 .tagranking1 （最差的）：
<?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'], $tag['tag']
); ?>
</span>
<?php endforeach; ?>
这是CSS：
/* put your size of choice */
.tagrank1{font-size: 0.3em;}
.tagrank2{font-size: 0.4em;}
.tagrank3{font-size: 0.5em;}
/* go on till tagrank10 */
此方法显示所有标签。如果你有很多，你可能不希望你的标签云成为标签风暴。HAVING TO在这种情况下，您将在 SQL 查询中附加一个子句：
-- minimum tag count is 8 --
HAVING count(tag) > 7
就这样
于 2010-07-14T18:19:27.060 回答
1
作为 Rails 的助手：
def tag_cloud (strings, counts)
max = counts.max
strings.map { |a| "<span style='font-size:#{((counts[strings.index(a)] * 4.0)/max).ceil}em'>#{a}</span> " }
end
从视图中调用它：
<%= tag_cloud($artists, $counts) %>
这会输出<span style='font-size:_em'>数组中的元素，这些元素将被转换为视图中的字符串，最终呈现如下：
<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>
最好有一个class属性并引用上面 Brendan 提到的样式表中的类。比在h1-h6语义上使用要好得多，并且使用<span>.
于 2008-10-02T21:47:32.207 回答
1
我知道这是一个非常古老的帖子，但我仍然在发布我的观点，因为它可能对将来的某人有所帮助。
这是我在我的网站中使用的标签云： http ://www.vbausefulcodes.in/
<?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>";
}
?>
于 2017-01-28T04:39:42.870 回答