使用h1到h6从阵列生成标签云的最佳方法是什么？

时间：2008-08-01 21:40:56

标签： php arrays cloud tag-cloud

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);

我希望生成一个标记云，其中$count标记中包含h6标记和h1标记的{{1}}中包含较高编号的艺术家。

8 个答案:

答案 0 :(得分：39)

您还需要为其添加对数函数。 （取自tagadelic，我的Drupal模块创建标签云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>"
}

答案 1 :(得分：29)

脱离我的头顶...... 

$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.">";
}

答案 2 :(得分：23)

也许这是一个学术性和偏离主题的问题，但由于文档结构和所有类似的事情，hX标签可能不是标签云的最佳选择。

也许span s或ol具有适当的类属性（加上一些CSS）？

答案 3 :(得分：8)

暂时使用此代码段，功能是prism-perfect.net。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>

答案 4 :(得分：6)

@Ryan

这是正确的，但它实际上使得标签的编号最小，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>";
}

答案 5 :(得分：2)

此方法适用于SQL/PostgreSQL狂热分子。它完成数据库中的整个工作，并打印带有“slugified”链接的文本。它仅对sql调用使用Doctrine ORM，我不使用对象。 假设我们有10种尺寸：

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 */

此方法显示所有标记。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，您可以在SQL查询中附加HAVING TO子句：

-- minimum tag count is 8 --

HAVING count(tag) > 7

这就是全部

答案 6 :(得分：1)

作为Rails中的帮手：

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

从视图中调用此方法：

<%= tag_cloud($artists, $counts) %>

这会在数组中输出<span style='font-size:_em'>元素，这些元素将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。比在语义上使用h1-h6要好得多，并且使用<span>的行李包装更少。

答案 7 :(得分：0)

我知道它很老的帖子。发布我的观点，因为它可能在将来帮助某人。

以下是我在我的网站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>";
}
?>
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