How to use the DEDECMS extension tag

How to use the DEDECMS extension tag?

DDEECMS extension tag demonstration example

Recommended learning: DEMENCMS

We can look at a sample tag: demotag.lib .php,

if(!defined('DEDEINC')) 
{ 
exit("Request Error!"); 
} 
function lib_demotag(&$ctag,&$refObj) 
{ 
global $dsql,$envs; 
 
$attlist="row|12,titlelen|24"; 
FillAttsDefault($ctag->CAttribute->Items,$attlist); 
extract($ctag->CAttribute->Items, EXTR_SKIP); 
$revalue = ''; 
 
//------------------------------------------------------ 
$revalue = 'Hello Word!'; 
//------------------------------------------------------ 
return $revalue; 
} 
?>

We will find that the tag works and our content is output.

$revalue = 'Hello Word!'; 
$revalue .=" 
Row:".$row.";TitleLen:".$titlelen;

So we can see that this attribute has been created as a variable and assigned a value.

Next we can further modify this label.

function lib_writerarc(&$ctag,&$refObj)

Next we can write query statements and related functions for underlying template processing

$revalue = ''; 
$innertext = $ctag->GetInnerText(); 
$ctp = new DedeTagParse(); 
$ctp->SetNameSpace('field', '[', ']'); 
$sql = "SELECT * FROM dede_archives WHERE writer='{$refObj->Fields['writer']}' limit 0, $row"; 
 
 
 
$dsql->Execute('me',$sql); 
while($rs = $dsql->GetArray('me')) 
{ 
 
$rs['title'] = cn_substr($rs['title'], $titlelen); 
 
$ctp->LoadSource($innertext); 
foreach($ctp->CTags as $tagid=>$ctag) { 
if(!emptyempty($rs[strtolower($ctag->GetName())])) { 
$ctp->Assign($tagid,$rs[$ctag->GetName()]); 
} 
} 
 
$revalue .= $ctp->GetResult(); 
}

Finally return this value return $revalue;

The entire file content is as follows:

if(!defined('DEDEINC')) 
{ 
exit("Request Error!"); 
} 
function lib_writerarc(&$ctag,&$refObj) 
{ 
global $dsql,$envs; 
 
$attlist="row|12,titlelen|24"; 
FillAttsDefault($ctag->CAttribute->Items,$attlist); 
extract($ctag->CAttribute->Items, EXTR_SKIP); 
$revalue = ''; 
$innertext = $ctag->GetInnerText(); 
$ctp = new DedeTagParse(); 
$ctp->SetNameSpace('field', '[', ']'); 
$sql = "SELECT * FROM dede_archives WHERE writer='{$refObj->Fields['writer']}' limit 0, $row"; 
$dsql->Execute('me',$sql); 
while($rs = $dsql->GetArray('me')) 
{ 
 
$rs['title'] = cn_substr($rs['title'], $titlelen); 
 
$ctp->LoadSource($innertext); 
foreach($ctp->CTags as $tagid=>$ctag) { 
if(!emptyempty($rs[strtolower($ctag->GetName())])) { 
$ctp->Assign($tagid,$rs[$ctag->GetName()]); 
} 
} 
 
$revalue .= $ctp->GetResult(); 
} 
return $revalue; 
} 
?>

View and debug through dynamic browsing of the page?aid=3

{dede:writerarc row='10' titlelen='6'} 
[field:title/]  
{/dede:writerarc}

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