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because front page has no arg(1) (node id) I cannot load promoted node[s] in page.tpl.php . all I want to do is print something in one part of front page if a specific content type node in about to load in node.tpl.php. I search it alot but find no answer.

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You mean a custom function?

I did a lot of this for a current project where we needed short little lists of nodes with different criterion all over. I found Views bulky and overkill in some places, so I added small functions to template.php. They're really just simple SQL SELECT statements.

For example:

function home_channel_list($title, $tids, $limit){

    $query = "SELECT t1.nid, MAX(t1.vid), t1.title, UNIX_TIMESTAMP(t2.field_pubdate_value) AS pubdate
                FROM {node} t1
                    JOIN field_revision_field_pubdate t2 ON t1.nid = t2.entity_id AND t1.vid = t2.revision_id
                    JOIN field_revision_field_channel t3 ON t1.nid = t3.entity_id AND t1.vid = t3.revision_id
                WHERE t3.field_channel_tid IN(".$tids.")
                    GROUP BY t1.nid ORDER BY pubdate DESC LIMIT ".$limit."";

        $result = db_query($query); 

        // Container div and title
        print '<div class="home-channel-block"><h2>'.$title.'</h2>';

        // Article list
        foreach ($result as $record) {
            $mypubdate = format_date($record->pubdate, 'custom', 'F j, Y, g:iA');
            print '<div class="home-channel-title"><a href="?q=node/'.$record->nid.'">'.$record->title.'</a></div>';
            print '<div class="home-channel-pubdate pubdate">'.$mypubdate.'</div>';         
        }

        // Clear and close the container div
        print '<div class="myclear"></div></div>';
}
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    yes I think sql solution in the only option in my specific needs, thank u.
    – sepehr
    Aug 10 '11 at 10:14
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Not 100% sure I understand - but I would create a block either from a view or with a custom function that pulls a list of articles where node_revision.promote = 1. Then just have it display on the front page only.

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    what I want to achieve is just cheking in page.tpl.php file that a specific content type node will be later load in node.tpl.php or not , either by user viewing node/nid or front page (in front page case by promoting node[s] of that specific content type). in former case it is easy like bellow:
    – sepehr
    Aug 3 '11 at 15:21
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    ` if (arg(0) == 'node') { $node = node_load(array('nid' => arg(1))); if (($node->type == 'slideshow') { //do some stuff } } ` I can check that current page is front or not but problem is that I am not sure promoted node will be that specific content type that I need. your second suggestion seems interesting , can you explain how I implement it? tnx.
    – sepehr
    Aug 3 '11 at 15:26
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have a look at node_page_default() in modules/node/node.module and it's output, but I think its better to use another page.tpl.php for those content type via suggesting new .tpl files to theme layer via this function in template.php:

function mytheme_preprocess_page(&$variables) {
  if (!empty($variables['node'])) {
    $variables['theme_hook_suggestions'][] = 'page__node__' . $variables['node']->type;
  }
}

so you can have page--node--news.tpl.php for news content type ...

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