Displaying the Preview image of Nextgen Gallery Using a Custom Select Query

You have to choose from an image of your gallery. If you don't want use one of them you can add a new image to the gallery, then click on Gallery settings (Click here for more settings) under the field Preview image  choose image from the drop down list!

Paste the bellow code in the template page, where you what to display the preview image of gallery. Don't forgot to change the gallery id.

<?php
$querystr = "SELECT wp_ngg_pictures.*, wp_ngg_gallery.* FROM wp_ngg_pictures, wp_ngg_gallery WHERE wp_ngg_pictures.pid = wp_ngg_gallery.previewpic AND wp_ngg_pictures.galleryid=5 ORDER BY wp_ngg_pictures.pid DESC
";

$pageposts = $wpdb->get_results($querystr, OBJECT);
$name=$pageposts[0]->filename;
$path=get_bloginfo('siteurl')."/".$pageposts[0]->path."/".$pageposts[0]->filename;
echo "<img src='".$path."' title='".$name."' width='100' height='75'/>";

?>

WordPress how to get the total count of posts from specific category

A custom function which will return total post counts from the specified category and its child categories.


function wp_get_cat_postcount($id) {

    $cat = get_category($id);

    $count = (int) $cat->count;

    $taxonomy = 'category';

    $args = array(

      'child_of' => $id,

    );

    $tax_terms = get_terms($taxonomy,$args);

    foreach ($tax_terms as $tax_term) {

        $count +=$tax_term->count;

    }

    return $count;

}

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How to display the list of child pages on the parent page.

Displays a list of WordPress pages as links. It is often used to customize the sidebar or header.

We can display the list of child pages on the parent page.

Displays the sub-pages of a single Page only;
uses the ID for a Page as the value.

if($post->post_parent)
{
$parent_title = get_the_title($post->post_parent);
echo "<h3 class='product1-title'>".$parent_title.":</h3>";
$children = wp_list_pages("title_li=&child_of=".$post->post_parent."&echo=0");
}
else
{
$parent_title = get_the_title($post->post_parent);
echo "<h3 class='product1-title'>".$parent_title.":</h3>";
$children = wp_list_pages("title_li=&child_of=".$post->ID."&echo=0");
}
if ($children) { ?>
<ul id="subnav">
<?php echo $children; ?>
</ul>
<?php }?>

Display custom wordpress gallery images from post attachment

How to display custom wordpress gallery images from post attachment

The [gallery] shortcode is used in a Post or Page to display a thumbnail gallery of images attached to that post. Or You can use like this: 

<table cellspacing="0" cellpadding="5" align="left">
    <tbody>
    <tr>
   
    <?php
    $images = get_children( array('post_parent' => $post->ID, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => 'ASC', 'orderby' => 'menu_order ID') );
    if ($images) {
    $size = 'thumbnail';
    $num_of_images = count($images);
        foreach ($images as $image) {
        $img_title = $image->post_title;   // title.
        $img_description = $image->post_content; // description.
        $img_caption = $image->post_excerpt; // caption.
        $img_url = wp_get_attachment_url($image->ID); // url of the full size image.
        $preview_array = image_downsize( $image->ID, $size );
        $img_preview = $preview_array[0]; // thumbnail or medium image to use for preview.
        ?>
    <td valign="top">
<a class="lightwindow" href="<?php echo $img_url; ?>" rel="example1"><img class="alignleft size-full wp-image-911" title="<?php echo $img_title; ?>" src="<?php echo $img_preview; ?>" alt="<?php echo $img_caption; ?>" width="100" height="100" /></a>
        </td>
        <?php
        }
    }?>
   
</tr>
</tbody>
</table>

WordPress Administration menu example

Here is a very simple example of the three steps just described. This plugin will add a sub-level menu item under the Settings top-level menu, and when selected, that menu item will cause a very basic screen to display

In this example, the function, my_plugin_menu(), adds a new item to the Administration menu via the add_options_page function.
<?php
add_action('admin_menu', 'my_plugin_menu');

function my_plugin_menu() {
add_options_page('My Plugin Options', 'My Plugin', 'manage_options', 'my-unique-identifier', 'my_plugin_options');
}

function my_plugin_options() {
if (!current_user_can('manage_options'))  {
wp_die( __('You do not have sufficient permissions to access this page.') );
}
echo '<div class="wrap">';
echo '<p>Here is where the form would go if I actually had options.</p>';
echo '</div>';
}
?>

How to add administration menus in wordpress

This article explains how plugin authors can add administration menus.

Using Wrapper Functions

Since most sub-level menus belong under the Settings, Tools, or Appearance menus, WordPress supplies wrapper functions that make adding a sub-level menu items to those top-level menus easier. Note that the function names may not match the names seen in the admin UI as they have changed over time:

Dashboard
<?php add_dashboard_page( $page_title, $menu_title, $capability, $menu_slug, $function); ?>


Posts
<?php add_posts_page( $page_title, $menu_title, $capability, $menu_slug, $function); ?>


Media
<?php add_media_page( $page_title, $menu_title, $capability, $menu_slug, $function); ?>


Links
<?php add_links_page( $page_title, $menu_title, $capability, $menu_slug, $function); ?>


Pages
<?php add_pages_page( $page_title, $menu_title, $capability, $menu_slug, $function); ?>


Comments
<?php add_comments_page( $page_title, $menu_title, $capability, $menu_slug, $function); ?>


Appearance
<?php add_theme_page( $page_title, $menu_title, $capability, $menu_slug, $function); ?>


Plugins
<?php add_plugins_page( $page_title, $menu_title, $capability, $menu_slug, $function); ?>


Users
<?php add_users_page( $page_title, $menu_title, $capability, $menu_slug, $function); ?>


Tools
<?php add_management_page( $page_title, $menu_title, $capability, $menu_slug, $function); ?>


Settings
<?php add_options_page( $page_title, $menu_title, $capability, $menu_slug, $function); ?>

More:Here is an example of a WordPress plugin that inserts new menus into various places:
 Administration_Menus