


PHP analysis and manipulation of strings and generation of tag clouds
This article mainly introduces the method of generating tag cloud based on word frequency in PHP, involving PHP analysis and manipulation of strings and tag cloud generation techniques. It has certain reference value. Friends in need can refer to it
The example of this article describes the method of generating tag cloud based on word frequency in PHP. The details are as follows:
Given a piece of text here, analyze the word frequency distribution of the text and generate a tag cloud
<?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 inpidual 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="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> <html> <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 id="Sample-nbsp-Tag-nbsp-Cloud">Sample Tag Cloud</h1> <p id="wrapper"> <?php echo getCloud( $freqData ) ?> </p> </body> </html>
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