Question

我尝试在我的网站上添加一个标签云，所以我在这里发现了这个代码一个网站http://stevethomas.com.au/php/how-to-make-a-tag-cloud-in-php-mysql-and-css.html，我非常喜欢它的想法，因为它很简单，我看到它有很好的反馈。我做了所有的步骤所以现在我有了这个test.php。与数据库的连接工作我没有得到任何错误，但它没有存储标签，我看不到任何标签。我的数据库是否有问题，因为我在此代码中没有看到任何原因。这段代码我添加到db：

CREATE TABLE `search` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `term` varchar(255) NOT NULL DEFAULT '',
  `counter` int(11) NOT NULL DEFAULT '1',
  `last_search` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  PRIMARY KEY (`id`),
  KEY `term` (`term`)
) ENGINE=InnoDB;

**

<?php
// connect to the database
$conn = mysql_connect('localhost', 'root', '******');
if (!$conn or !mysql_select_db('tags', $conn)) die('cannot connect to db');

// handle new searches
if (isset($_GET['action']) and $_GET['action'] == 'search')
{
    // get the current time
    $now = date("Y-m-d H:i:s");

    // get the submitted term and prepare it for the database query
    $term = mysql_real_escape_string(strip_tags(trim($_GET['term'])));

    // check if the term has been submitted before
    if (mysql_result(mysql_query("SELECT COUNT(id) FROM search WHERE term = '$term'"), 0) > 0)
    {
        // the term exists - update the counter and the last search timestamp
        mysql_query("UPDATE search SET counter = counter+1, last_search = '$now' WHERE term = '$term'");
    } else {
        // the term does not exist - insert a new record
        mysql_query("INSERT INTO search (term, last_search) VALUES ('$term', '$now')");
    }
}

// prepare the tag cloud array for display
$terms = array(); // create empty array
$maximum = 0; // $maximum is the highest counter for a search term

$query = mysql_query("SELECT term, counter FROM search ORDER BY counter DESC LIMIT 30");

while ($row = mysql_fetch_array($query))
{
    $term = $row['term'];
    $counter = $row['counter'];

    // update $maximum if this term is more popular than the previous terms
    if ($counter > $maximum) $maximum = $counter;

    $terms[] = array('term' => $term, 'counter' => $counter);

}

// shuffle terms unless you want to retain the order of highest to lowest
shuffle($terms); 
?>
<!DOCTYPE html>
<html>
    <head>
        <title>Tag Cloud Example</title>
        <style type="text/css">
            #tagcloud {
                width: 300px;
                background:#CFE3FF;
                color:#0066FF;
                padding: 10px;
                border: 1px solid #559DFF;
                text-align:center;
                -moz-border-radius: 4px;
                -webkit-border-radius: 4px;
                border-radius: 4px;
            }
            #tagcloud a:link, #tagcloud a:visited {
                text-decoration:none;
                color: #333;
            }
            #tagcloud a:hover {
                text-decoration: underline;
            }
            #tagcloud span {
                padding: 4px;
            }
            #tagcloud .smallest {
                font-size: x-small;
            }
            #tagcloud .small {
                font-size: small;
            }
            #tagcloud .medium {
                font-size:medium;
            }
            #tagcloud .large {
                font-size:large;
            }
            #tagcloud .largest {
                font-size:larger;
            }
        </style>
    </head>
    <body>
        <h1>Search</h1>
        <form id="search" method="get" action="?action=search">
            <input type="text" name="term" id="term" />
            <input type="submit" name="submit" id="submit" value="Search" />
        </form>

        <h2>Popular Searches</h2>
        <div id="tagcloud">
            <?php 
            // start looping through the tags
            foreach ($terms as $term):
                // determine the popularity of this term as a percentage
                $percent = floor(($term['counter'] / $maximum) * 100);
                // determine the class for this term based on the percentage
                if ($percent < 20):
                    $class = 'smallest';
                elseif ($percent >= 20 and $percent < 40):
                    $class = 'small';
                elseif ($percent >= 40 and $percent < 60):
                    $class = 'medium';
                elseif ($percent >= 60 and $percent < 80):
                    $class = 'large';
                else:
                    $class = 'largest';
                endif;
            ?>
            <span class="<?php echo $class; ?>">
                <a href="search.php?search=<?php echo urlencode($term['term']); ?>"><?php echo $term['term']; ?></a>
            </span>
            <?php endforeach; ?>
        </div>
    </body>
</html>

标签云和MySQL

0 个答案: