dedecms自定義標簽的方法，給出一個簡單的解析及舉例說明

首先我們來看dedecms一個現(xiàn)成的標簽flink（友情鏈接標簽）,然后我們根據(jù)flink標簽自已寫一個簡單的標簽，這樣我們就很容易掌握用dedecms自定義標簽了。我們看代碼：登錄dedecms后臺=》模板=》標簽源碼管理=》flink.lib.php

里面的代碼如下：

<?php//檢查是否定義include文件夾的路徑DEDEINC
if(!defined('DEDEINC'))
{
exit("Request Error!");
}

//寫標簽時，默認調(diào)用的方法

function lib_flink(&$ctag,&$refObj)

{

// 聲明全局的數(shù)據(jù)庫連接

　global $dsql; //標簽擁有的屬性和默認值　　

$attlist="type|textall,row|24,titlelen|24,linktype|1,typeid|0";

FillAttsDefault($ctag->CAttribute->Items,$attlist);　//將標簽中的值導入到當前符號表中　　　

extract($ctag->CAttribute->Items, EXTR_SKIP);

$totalrow = $row;

$revalue = '';　　　//以下為拼裝SQL查詢語句

$wsql = " where ischeck >= '$linktype' ";

if($typeid == 0)

{

$wsql .= '';

}

else

{

$wsql .= "And typeid = '$typeid'";

}

if($type=='image')

{

$wsql .= " And logo<>'' ";

}

else if($type=='text')

{

$wsql .= " And logo='' ";

}

$equery = "Select * from dede_flink $wsql order by sortrank asc limit 0,$totalrow";

//檢查標記中是否已經(jīng)包含innertext底層模板

if(trim($ctag->GetInnerText())=='') $innertext = "<li>[field:link /]</li>";

else $innertext = $ctag->GetInnerText();

//設(shè)置查詢條件并執(zhí)行查詢

$dsql->SetQuery($equery);

$dsql->Execute();　//通過循環(huán)獲取查詢的對象

　　while($dbrow=$dsql->GetObject())

{if($type=='text'||$type=='textall')

{

$link = "<a href='".$dbrow->url."' target='_blank'>".cn_substr($dbrow->webname,$titlelen)."</a> ";

}

else if($type=='image')

{

$link = "<a href='".$dbrow->url."' target='_blank'><img src='".$dbrow->logo."' width='88' height='31' border='0'></a> ";

}

else

{

if($dbrow->logo=='')

{

$link = "<a href='".$dbrow->url."' target='_blank'>".cn_substr($dbrow->webname,$titlelen)."</a> ";

}

else

{

$link = "<a href='".$dbrow->url."' target='_blank'><img src='".$dbrow->logo."' width='88' height='31' border='0'></a> ";

}

}　　

// 對innertext中的字符串進行值替換(暫時不清楚為什么標簽里面的row只是一個數(shù)值，但是卻在這里能成為一個數(shù)組，求解答) 　　　　　

$rbtext = preg_replace("/\[field:url([\/\s]{0,})\]/isU", $row['url'], $innertext);

$rbtext = preg_replace("/\[field:webname([\/\s]{0,})\]/isU", $row['webname'], $rbtext);

$rbtext = preg_replace("/\[field:logo([\/\s]{0,})\]/isU", $row['logo'], $rbtext);

$rbtext = preg_replace("/\[field:link([\/\s]{0,})\]/isU", $link, $rbtext);

$revalue .= $rbtext;

}　//返回替換處理好的字符串

　　return $revalue;

}

?>

下面，我們仿照上面的例子自己去寫一個標簽

<?php
if (! defined ( 'DEDEINC' )) {
exit ( "Request Error!" );
}

function lib_aaa(&$ctag, &$refObj)
{
global $dsql;
$attlist = "topid|0,row|10";
FillAttsDefault ( $ctag->CAttribute->Items, $attlist );
extract ( $ctag->CAttribute->Items, EXTR_SKIP );
$condtion="";
$revalue='';
if($topid==0)
{
$condtion.=" where topid=0";
}
elseif ($topid!=0)
{
$condtion.=" where topid <> 0";
}
$equery="select * from `dede_arctype` $condtion";
if(trim($ctag->GetInnerText())=='') $innertext = "<li>[field:typename /]</li>";
else $innertext = $ctag->GetInnerText();
$dsql->SetQuery($equery);
$dsql->Execute();

while($dbrows=$dsql->GetObject())
{
$rbtext = preg_replace("/\[field:typename([\/\s]{0,})\]/isU",$dbrows->typename, $innertext);
$revalue.=$rbtext;
}
return $revalue;
}
?>

如果有讀者對方法的參數(shù)&$ctag,&$refObj不是很清楚，請從index.php中的處理開始查看，具體的應該是在include目錄下的Dedetag.class.php中,下面我們來寫一個最簡單的helloword標簽

<?php
if(!defined('DEDEINC'))
{
exit("Request Error!");
}
function lib_demotag(&$ctag,&$refObj)
{
global $dsql,$envs;

//屬性處理
$attlist="row|12,titlelen|24";
FillAttsDefault($ctag->CAttribute->Items,$attlist);
extract($ctag->CAttribute->Items, EXTR_SKIP);
$revalue = '';

//你需編寫的代碼，不能用echo之類語法，把最終返回值傳給$revalue
//------------------------------------------------------

$revalue = 'Hello Word!';

//------------------------------------------------------
return $revalue;
}
?>

效果圖如下所求：

下面我們再寫一個難度大一點的自定義標簽的代碼如下

<?php
if (! defined ( 'DEDEINC' )) {
exit ( "Request Error!" );
}

function lib_aaa(&$ctag, &$refObj)
{
global $dsql;
$attlist = "topid|0,row|10";
FillAttsDefault ( $ctag->CAttribute->Items, $attlist );
extract ( $ctag->CAttribute->Items, EXTR_SKIP );
$condtion="";
$revalue='';
if($topid==0)
{
$condtion.=" where topid=0";
}
elseif ($topid!=0)
{
$condtion.=" where topid <> 0";
}
$equery="select * from `dede_arctype` $condtion";
if(trim($ctag->GetInnerText())=='') $innertext = "<li>[field:typename /]</li>";
else $innertext = $ctag->GetInnerText();
$dsql->SetQuery($equery);
$dsql->Execute();

while($dbrows=$dsql->GetObject())
{
$rbtext = preg_replace("/\[field:typename([\/\s]{0,})\]/isU",$dbrows->typename, $innertext);
$revalue.=$rbtext;
}
return $revalue;
}
?>

這樣我們可以看到效果如下所示

如果有對方法的參數(shù)&$ctag,&$refObj不是很清楚，請從index.php中的處理開始查看，具體的應該是在include目錄下的Dedetag.class.php中。其實要用簡單的dedecms自定義標簽是完全可以參照現(xiàn)在的例子寫出來的。