如何将PHP程序改写为生成长尾关键词的标签云？
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本文共计551个文字，预计阅读时间需要3分钟。
给定一段文本，分析文本的词频分布，生成tag云：
php
// Store frequency of words in an array $freqData$freqData=array();
// Random words
给定一段文本，此代码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" href="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" "www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="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>
本文共计551个文字，预计阅读时间需要3分钟。
给定一段文本，分析文本的词频分布，生成tag云：
php
// Store frequency of words in an array $freqData$freqData=array();
// Random words
给定一段文本，此代码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" href="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" "www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="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>