织梦dedecms怎么添加一个函数来实现任意字段调用

function table($table, $field, $id)
{
    global $dsql;
    $primarys = array();
    $table = strpos($table, '#@_') === false?(strpos($table, 'dede_') ===false?''.$table:str_replace('dede_','',$table)):$table;
    $dsql -> Execute("me","SHOW COLUMNS FROM `$table`");   
    while ($r = $dsql->GetArray())
    {
        if($r['Key'] == 'PRI') $primarys[] = $r['Field'];
    }
    if(!empty($primarys))
    {
        $primary = $primarys[0];
        $result = $dsql -> GetOne("SELECT `$field` FROM `$table` WHERE `$primary`= $id");
    }
    return isset($result[$field])?$result[$field]:'';   
}

{dede:标记 function='table("要调用的表名","要调用的字段",@me)'/}

[field:字段 function=table(“要调用的表名","要调用的字段",@me)/]

{dede:arclist row='10' titlelen='24'}
[field:id function=table('addonarticle','body',@me)/]
{/dede:arclist}