PHP和MySQL生成的标签云实现代码
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;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:http://www.phprm.com/develop/fs1036.html
随意转载~但请保留教程地址★