Filtering categories in the permalink structure

The way to remove the parent category from a permalink when using the 

/%category%/%postname%/ custom structure 

 add_filter( 'post_link', 'remove_parent_cats_from_link', 10, 3 ); 

function remove_parent_cats_from_link( $permalink, $post, $leavename )
{
    $cats = get_the_category( $post->ID );
    if ( $cats ) {
     // Make sure we use the same start cat as the permalink generator
     usort( $cats, '_usort_terms_by_ID' ); // order by ID
     $category = $cats[0]->slug;
     if ( $parent = $cats[0]->parent ) {
     // If there are parent categories, collect them and replace them in the link
       $parentcats = get_category_parents( $parent, false, '/', true );
       // str_replace() is not the best solution if you can have duplicates:
       // myexamplesite.com/luxemburg/luxemburg/ will be stripped down to myexamplesite.com/
       // But if you don't expect that, it should work
        $permalink = str_replace( $parentcats, '', $permalink );
        }
    }
    return $permalink;
}

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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;

}

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

Category Posts

<?php
/*
Template Name: Category Posts
*/
get_header();
?>

        <div id="content-container">
            <div id="content" role="main">
<?php
//get all terms (e.g. categories or post tags), then display all posts in each term
$taxonomy = 'category';//  e.g. post_tag, category
$param_type = 'category__in'; //  e.g. tag__in, category__in
$term_args=array(
 'orderby' => 'name',
 'order' => 'ASC'
);
$terms = get_terms($taxonomy,$term_args);
if ($terms) {
 foreach( $terms as $term ) {
   $args=array(
     "$param_type" => array($term->term_id),
     'post_type' => 'post',
     'post_status' => 'publish',
     'posts_per_page' => -1,
     'caller_get_posts'=> 1
     );
   $my_query = null;
   $my_query = new WP_Query($args);
   if( $my_query->have_posts() ) {
     echo '<h2>List of Posts in '.$taxonomy .' '.$term->name.'</h2>';
     while ($my_query->have_posts()) : $my_query->the_post(); ?>
     <div id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
                    <?php if ( is_front_page() ) { ?>
                        <h2 class="entry-title"><?php the_title(); ?></h2>
                    <?php } else { ?>
                        <h1 class="entry-title"><?php the_title(); ?></h1>
                    <?php } ?>

                    <div class="entry-content">
                        <?php //the_content();
                        the_excerpt();
                        the_post_thumbnail(); ?>
                    </div><!-- .entry-content -->
                </div>
      
<?php

           endwhile;
   }
 }
}
wp_reset_query();  // Restore global post data stomped by the_post().
?>

            </div><!-- #content -->
        </div><!-- #content-container -->

<?php get_sidebar(); ?>
<?php get_footer(); ?>

Category Posts Widget

Adds a widget that shows the most recent posts in a single category.

Category Posts Widget is a light widget designed to do one thing and do it well: display the most recent posts from a certain category.

Category Posts Widget

How to create a built-in contact form for your WordPress theme

Many WordPress plugins can add a contact form to your blog, but a plugin is not necessary.
In this tutorial, I’m going to show you how you can create a built-in contact form for your WordPress theme.

How to create a built-in contact form for your WordPress theme

What is a CMS web site?

CMS or a 'Content Management System' it's allows you to control and manage the content within your web site - without technical training. Using this uncomplicated system you can very easily add, delete images and edit text in your web site.

A Content Management System (CMS) is an application through which you can easily create and manage dynamic web content.

WordPress create a page with out temlpate

Is WordPress create a page with out template?

Yes. WordPress creates a page with out template
//include wordpress
define('WP_USE_THEMES',false);
require_once('../wp-load.php');

WordPress is a free and open source blogging tool

WordPress is a free and open source blogging tool and publishing platform powered by PHP and MySQL. It is often customized into a content management system (CMS).It has many features including a plug-in architecture and a template system.