标签云的实现代码

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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：

 

 1 <?PHP

 2 /**

 3  * WNiaoBlog Tag Template ShowTag

 4  *

 5  * @package WNiaoBlog

 6  *

 7  * @subpackage Tag

 8  */

 9 

10 //Connect the database

11 //include('../include/config.php');

12 

13 /**

14  * CountTag() - Statistics labels appear the number,and the data to be stored in the two array

15  *

16  * GetTag() - Access the Tag's Labels from the database

17  */

18 

19 function CountTag($String){

20      $TagString = $String; 

21      //echo $TagString."<br><br><br>";

22      $Tags = explode(",",$TagString);

23      $n = 1;

24      $i = 0;

25      $Continue = TRUE;

26      //echo $Tags[1]."<br><br><br>";

27      //in case no-label's article

28      while($Tags[$n] OR $Tags[++$n] OR $Tags[++$n] ){

29      $EachTag = $Tags[$n++];

30      //echo $EachTag."<br><br><br>";

31      $Continue = TRUE;

32      for($i=0;$Continue;$i++){

33          if( $EachTagStr[$i][0] ) {

34              if( $EachTagStr[$i][0] == $EachTag ){

35                  $EachTagStr[$i][1]++;

36                  $Continue = FALSE;

37                 }

38              else {

39                  if( $EachTagStr[$i+1][0] ) $Continue = TRUE;

40                    else {

41                      $EachTagStr[$i+1][0] = $EachTag;

42                      $EachTagStr[$i+1][1] = 1;

43                      $Continue = FALSE;

44                    }

45              }

46         } else { //initialize the array $EachTagStr[][]

47                  $EachTagStr[$i][0] = $EachTag;

48                  $EachTagStr[$i][1] = 1;

49                  $Continue = FALSE;

50             }

51         }

52     }

53     return $EachTagStr;

54 }

55 

56 function ShowTag($Row,$ablink){

57      $i = 0;

58      while($Row[$i][0]){

59      $EachTag = $Row[$i][0];

60      $EachCount = $Row[$i][1];

61      $Size = SetSize($EachCount);

62      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>";

63      $i++;

64     }

65 }

66 

67 function GetTag(){

68      $QuerySet = mysql_query("select * from article");

69      while($Row = mysql_fetch_array($QuerySet)){

70          $Tag = $Row['tag'];

71          $TagString = $TagString.",".$Tag;

72         }

73      return $TagString;

74 }

75 

76 function SetSize($Size){

77      $Size += 10;

78      if($Size > 30)

79      $Size = 30;

80      return $Size;

81 }

82 

83 //Go 

84 echo "<div id=showtag>";

85 echo "<p  class='med1' style='color:#046111'  >标签云</p>";

86 $String = GetTag();

87 $Row = CountTag($String);

88 ShowTag($Row,$ablink);

89 echo "</div>";

90 

91 ?>

 

OK,DONE!