用户输入文本和输入的文本在过去的一个标签云,标签云是一个用户生成的标签的可视化描述,或只是一个网站的文字内容,通常用来描述网站的内容。
为此,我们将创建一个HTML表格,将接受用户文本,也让用户可以看到从 MySQL数据库,其中包含在过去输入的文本生成的标签云,代码如下:
<?php echo '<form method="post" action="tag_cloud_gen.php" name="gen_tag_db">'; echo '<p>Input your text here:<br /><textarea name="tag_input" rows="20" cols="80"></textarea></p>'; echo '<input type="submit" name="submit">'; echo '</form>'; ?> <br /> <h3>OR</h3> <br /> <p>see the current tag cloud here</p> <?php echo '<form name="show_tag_cloud" method="post" action="show_tag_cloud.php">'; echo '<input type="submit" value="show current tag cloud" >'; echo '</form>'; ?>
其中每个计算其频率和对将进入一个数组,输入的文本将被表征为单个词。然后将这个数组存储到一个MySQL数据库,我们可以选择保存在MySQL数据库表coloumn存储任何链接,如果这个项目未来的扩展。
1) tag_id -- int,primary key,auto increament 1)tag_id - 整型,主键,自动increament
2) keyword - varchar(20),unique 2)关键字 - 数据类型为varchar(20),独特的
3) weight - int 3)重量 - 诠释
4) link - varchar(256). 4)链接 - 为varchar(256)。
代码如下:
<?php /** * this function will update the mysql database table to reflect the new count of the keyword * i.e. the sum of current count in the mysql database &amp;amp;amp; current count in the input. */ function update_database_entry($connection, $table, $keyword, $weight) { $string = $_POST['tag_input']; $connection = mysql_connect("localhost", "root", ""); /** * now comes the main part of generating the tag cloud * we would use a css styling for deciding the size of the tag according to its weight, * both of which would be fetched from mysql database. */ $query = "select * from `tagcloud_db`.`tags` where keyword like '%$keyword%'"; $resultset = mysql_query($query, $connection); if (!$resultset) { die('Invalid query: ' . mysql_error()); } else { while ($row = mysql_fetch_array($resultset)) { $query = "UPDATE `tagcloud_db`.`tags` SET weight=" . ($row[2] + $weight) . " where tag_id=" . $row[0] . ";"; mysql_query($query, $connection); } } } ?> <?php /* * get the input string from the post and then tokenize it to get each word, save the words in an array * in case the word is repeated add '1' to the existing words counter */ $count = 0; $tok = strtok($string, " t,;.'\"!&-`nr"); //considering line-return,line-feed,white space,comma,ampersand,tab,etc... as word separator if (strlen($tok) > 0) $tok = strtolower($tok); $words = array(); $words[$tok] = 1; while ($tok !== false) { echo "Word=$tok<br />"; $tok = strtok(" t,;.'\"!&-`nr"); if (strlen($tok) > 0) { $tok = strtolower($tok); if ($words[$tok] >= 1) { $words[$tok] = $words[$tok] + 1; } else { $words[$tok] = 1; } } } print_r($words); echo '<br /><br />'; /** * now enter the above array of word and corresponding count values into the database table * in case the keyword already exist in the table then update the database table using the function 'update_database_entry(...)' */ $table = "tagcloud_db"; mysql_select_db($table, $connection); foreach ($words as $keyword => $weight) { $query = "INSERT INTO `tagcloud_db`.`tags` (keyword,weight,link) values ('" . $keyword . "'," . $weight . ",'NA')"; if (!mysql_query($query, $connection)) { if (mysql_errno($connection) == 1062) { update_database_entry($connection, $table, $keyword, $weight); } } } mysql_close($connection); ?>
做出anether文件和将其命名为style.css文件,把下面的代码:
HTML, BODY { padding: 0; border: 0px none; font-family: Verdana; font-weight: none; } .tags_div { padding: 3px; border: 1px solid #A8A8C3; background-color: white; width: 500px; -moz-border-radius: 5px; } H1 { font-size: 16px; font-weight: none; } A:link { color: #676F9D; text-decoration: none; } A:hover { text-decoration: none; background-color: #4F5AA1; color: white; }
这将使我们的标签云外观漂亮,它保存为style.css的,再次,使一个新的PHP文件,并命名它show_tag_cloud.php。
在PHP代码中,如下我们连接到MySQL数据库,获取所有的标签,其重量和纽带,然后计算每个使用它的重量及最小的标签大小假定为标签的大小,它也是每一个标签从数据库中检索或与Google链接,如果没有链接存在,即"不适用"的链接,代码如下:
<?php $connection = mysql_connect("localhost", "root", ""); $table = "tagcloud_db"; $words = array(); $words_link = array(); mysql_select_db($table, $connection); $query = "SELECT keyword,weight,link FROM `tagcloud_db`.`tags`;"; if ($resultset = mysql_query($query, $connection)) { while ($row = mysql_fetch_row($resultset)) { $words[$row[0]] = $row[1]; $words_link[$row[0]] = $row[2]; } } // Incresing this number will make the words bigger; Decreasing will do reverse $factor = 0.5; // Smallest font size possible $starting_font_size = 12; // Tag Separator $tag_separator = ' '; $max_count = array_sum($words); ?> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML> <HEAD> <TITLE> Tag Cloud Generator </TITLE> <META NAME="Keywords" CONTENT="tag, cloud, php, mysql"> <META NAME="Description" CONTENT="A Tag Cloud using php and mysql"> <LINK REL="stylesheet" HREF="style.css" TYPE="text/css"> </HEAD> <BODY> <center><h1>Tag Cloud using php and mysql </h1><div align='center' class='tags_div'> <?php foreach ($words as $tag => $weight) { $x = round(($weight * 100) / $max_count) * $factor; $font_size = $starting_font_size + $x . 'px'; if ($words_link[$tag] == 'NA') echo "<span style='font-size: " . $font_size . "; color: #676F9D;'><a href='http://www.google.co.in/search?hl=en&q=" . $tag . "&meta='>" . $tag . "</a></span>" . $tag_separator; else echo "<span style='font-size: " . $font_size . "; color: #676F9D;'><a href='http://" . $words_link[$tag] . "/'>" . $tag . "</a></span>" . $tag_separator; } ?> </div></center> </BODY> </HTML>
现在把他们所有在您的Web服务器的根目录,并观看结果。 每个查询会给你新的结果,随着时间的推移,数据库的增长。
教程链接:
随意转载~但请保留教程地址★