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本文实例讲述了php实现根据词频生成tag云的方法。分享给大家供大家参考。具体如下：
这里给定一段文本，分析文本的词频分布，生成tag云
<?php
/**
* Tag cloud demo based on word frequency
* @author: unknown
* @since: 2007-02-27
*/
// Store frequency of words in an array
$freqData = array();
// Random words
$lorem = "Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
Phasellus vestibulum ullamcorper tortor. Aenean quis lacus quis neque
adipiscing ultricies. Pellentesque tincidunt ligula vitae nibh ornare
pharetra. Proin dignissim tortor. Donec et ipsum nec tellus gravida
tempor. Aliquam ullamcorper purus vel felis. Praesent faucibus.
Curabitur porta. Nulla in lorem quis mi lacinia fringilla. Integer
adipiscing mi quis felis. Pellentesque habitant morbi tristique senectus
et netus et malesuada fames ac turpis egestas. Quisque sagittis ante in
arcu. Sed libero enim, venenatis sit amet, vestibulum at, porttitor id,
neque. Vestibulum ornare semper erat. Sed tincidunt nibh et massa. Cras
sed diam. Quisque blandit enim.
Sed nonummy. Aenean mollis turpis quis enim. Nam massa nulla, varius
molestie, aliquet et, feugiat eget, nisi. Sed mollis, leo ut pretium
placerat, nibh turpis egestas ipsum, sed aliquam neque enim in risus.
Nullam nisl. Sed tincidunt leo quis tellus. Mauris non lorem. Aenean
tristique justo at arcu. Fusce et lorem. Nam sodales. Mauris condimentum
diam. Nam commodo. Cum sociis natoque penatibus et magnis dis parturient
montes, nascetur ridiculus mus. Cras ac risus. Proin et dolor laoreet mi
gravida sodales. Duis bibendum, ipsum posuere egestas posuere, dui lacus
feugiat turpis, id tincidunt urna est sit amet est. Cras eu sem.
";
// Get individual words and build a frequency table
foreach( str_word_count( $lorem, 1 ) as $word )
{
// For each word found in the frequency table,
//increment its value by one
array_key_exists($word,$freqData)?$freqData[$word]++:$freqData[$word]=0;
}
// ==============================================================
// = Function to actually generate the cloud from provided data =
// ==============================================================
function getCloud($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'
. '" class="tag_cloud" rel="nofollow noopener noreferrer" href="http://www.google.com/search?q='
. $tag
. '" title="\"' . $tag . '' returned a count of ' . $count
. '">'
. htmlspecialchars( stripslashes( $tag ) ) . '</a>';
}
return join( "\n", $cloudTags ) . "\n";
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Tag Cloud Demo</title>
<style type="text/css" media="screen">
/*<![CDATA[*/
.tag_cloud { padding: 3px; text-decoration: none; }
.tag_cloud:link { color: #81d601; }
.tag_cloud:visited { color: #019c05; }
.tag_cloud:hover { color: #ffffff; background: #69da03; }
.tag_cloud:active { color: #ffffff; background: #ACFC65; }
/*]]>*/
</style>
</head>
<body>
<h1>Sample Tag Cloud</h1>
<div id="wrapper">
<?php echo getCloud( $freqData ) ?>
</div>
</body>
</html>
希望本文所述对大家的php程序设计有所帮助。
到此这篇关于php实现根据词频生成tag云的方法就介绍到这了。人生，伟业的建立，不在能知，乃在能行。流年似水，如歌，承受委屈是一种胸怀，接受误解是一种心怀，这个世界上失去什么东西都不可怕，唯一可怕的是失去你的心，失去你的勇气，只要你坚韧不拔地奋斗，只要你看向未来，天边彩虹就永远属于你，生命的辉煌也一定永远属于你。更多相关php实现根据词频生成tag云的方法内容请查看相关栏目，小编编辑不易，再次感谢大家的支持！
