php标签云的实现代码

数据库中，存放文章的表中有“tag”字段，用来存放标签。标签之间用“,”分隔。比如“php,vb,随笔”。 
下面的实现代码，将标签从数据库中搜出来，并格式化处理，使其以出现的次数为依据显示出不同大小的文字连接。 
其中的细节，不做解释了！ 
观念陈、方法笨、效率低的标签云的实现代码如下： 
复制代码 代码如下: 
/** 
* wniaoblog tag template showtag 
* 
* @package wniaoblog 
* 
* @subpackage tag 
*/ 
//connect the database 
//include('../include/config.php'); 
/** 
* counttag() - statistics labels appear the number,and the data to be stored in the two array 
* 
* gettag() - access the tag's labels from the database 
*/ 
function counttag($string){ 
$tagstring = $string; 
//echo $tagstring." 
"; 
$tags = explode(",",$tagstring); 
$n = 1; 
$i = 0; 
$continue = true; 
//echo $tags[1]." 
"; 
//in case no-label's article 
while($tags[$n] or $tags[++$n] or $tags[++$n] ){ 
$eachtag = $tags[$n++]; 
//echo $eachtag." 
"; 
$continue = true; 
for($i=0;$continue;$i++){ 
if( $eachtagstr[$i][0] ) { 
if( $eachtagstr[$i][0] == $eachtag ){ 
$eachtagstr[$i][1]++; 
$continue = false; 
} 
else { 
if( $eachtagstr[$i+1][0] ) $continue = true; 
else { 
$eachtagstr[$i+1][0] = $eachtag; 
$eachtagstr[$i+1][1] = 1; 
$continue = false; 
} 
} 
} else { //initialize the array $eachtagstr[][] 
$eachtagstr[$i][0] = $eachtag; 
$eachtagstr[$i][1] = 1; 
$continue = false; 
} 
} 
} 
return $eachtagstr; 
} 
function showtag($row,$ablink){ 
$i = 0; 
while($row[$i][0]){ 
$eachtag = $row[$i][0]; 
$eachcount = $row[$i][1]; 
$size = setsize($eachcount); 
echo " $i++; 
} 
} 
function gettag(){ 
$queryset = mysql_query("select * from article"); 
while($row = mysql_fetch_array($queryset)){ 
$tag = $row['tag']; 
$tagstring = $tagstring.",".$tag; 
} 
return $tagstring; 
} 
function setsize($size){ 
$size += 10; 
if($size > 30) 
$size = 30; 
return $size; 
} 
//go 
echo " 
"; 
echo "标签云"; 
$string = gettag(); 
$row = counttag($string); 
showtag($row,$ablink); 
echo " 
"; 
?> 

ok,done!