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 nequeadipiscing ultricies. Pellentesque tincidunt ligula vitae nibh ornarepharetra. Proin dignissim tortor. Donec et ipsum nec tellus gravidatempor. Aliquam ullamcorper purus vel felis. Praesent faucibus.Curabitur porta. Nulla in lorem quis mi lacinia fringilla. Integeradipiscing mi quis felis. Pellentesque habitant morbi tristique senectuset netus et malesuada fames ac turpis egestas. Quisque sagittis ante inarcu. Sed libero enim, venenatis sit amet, vestibulum at, porttitor id,neque. Vestibulum ornare semper erat. Sed tincidunt nibh et massa. Crassed diam. Quisque blandit enim.Sed nonummy. Aenean mollis turpis quis enim. Nam massa nulla, variusmolestie, aliquet et, feugiat eget, nisi. Sed mollis, leo ut pretiumplacerat, nibh turpis egestas ipsum, sed aliquam neque enim in risus.Nullam nisl. Sed tincidunt leo quis tellus. Mauris non lorem. Aeneantristique justo at arcu. Fusce et lorem. Nam sodales. Mauris condimentumdiam. Nam commodo. Cum sociis natoque penatibus et magnis dis parturientmontes, nascetur ridiculus mus. Cras ac risus. Proin et dolor laoreet migravida sodales. Duis bibendum, ipsum posuere egestas posuere, dui lacusfeugiat turpis, id tincidunt urna est sit amet est. Cras eu sem.";// Get individual words and build a frequency tableforeach( 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" 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>
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