标签云的实现代码

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乌鸟heart - 博客园： http://www.cnblogs.com/wuniaoheart/ 

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：

<?PHP
/**
 * 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."<br><br><br>";
     $Tags = explode(",",$TagString);
     $n = 1;
     $i = 0;
     $Continue = TRUE;
     //echo $Tags[1]."<br><br><br>";
     //in case no-label's article
     while($Tags[$n] OR $Tags[++$n] OR $Tags[++$n] ){
     $EachTag = $Tags[$n++];
     //echo $EachTag."<br><br><br>";
     $Continue = TRUE;
     for($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 "<a style='color:BLUE ; font-size:".$Size." ' onMouseOver=this.style.color='#900000' onMouseOut=this.style.color='BLUE'  href='".$ablink."tag?tag=".$EachTag."' target='_self' > ".$EachTag."(".$EachCount.")"." </a>";
     $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 "<div id=showtag>";
echo "<p  class='med1' style='color:#046111'  >标签云</p>";
$String = GetTag();
$Row = CountTag($String);
ShowTag($Row,$ablink);
echo "</div>";

?>

OK,DONE!