php实现根据词频生成tag云的方法

5年以前 | 阅读数：673 次 | 编程语言：PHP

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" 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。