Adding Widgets Between Posts in the Index Page

For a child theme of the (current) default theme Twenty Fifteen – a way to add a new sidebar aka widget area to show after the first post in the index page; making use of the action hook ‘the_post’.

/* WIDGET AREAS aka SIDEBARS INBETWEEN POSTS IN LOOP OF INDEX PAGE */

add_action( 'after_setup_theme', 'twentyfifteen_child_setup' );

function twentyfifteen_child_setup() {
add_action( 'widgets_init', 'twentyfifteen_child_widgets_init' );
add_action( 'the_post', 'twentyfifteen_child_inter_posts_sidebars' );
}

//register sidebar for inbetween posts

function twentyfifteen_child_widgets_init() {

	register_sidebar( array(
		'name' => __( 'First Inter-Posts Widget Area ', 'twentyfifteen' ),
		'id' => 'inter-posts-1',
		'description'   => __( 'Add widgets here to appear between post 1 and 2 in your index page.', 'twentyfifteen' ),
		'before_widget' => '<aside id="%1$s" class="widget inter-post-widget %2$s">',
		'after_widget'  => '</aside>',
		'before_title'  => '<h2 class="widget-title">',
		'after_title'   => '</h2>',
	) );

}

//widget output between posts in index page

function twentyfifteen_child_inter_posts_sidebars() {
	global $wp_query;
	if( is_home() && $wp_query->current_post == 1 ) {
		dynamic_sidebar( 'inter-posts-1' );
	}
	
}

you will need to create your own CSS based on the CSS class .inter-post-widget …

example:

.inter-post-widget { 
	margin: 20px 8.33%;
	padding: 3%;
	width: auto;
}

Injecting Multiple adsense Ads into a WordPress Loop

The versatile code injects for instance adsense ad codes several times into the posts of an index or archive page, starting with a pre-set post, and then repeated in regular intervals (up to a set limit of ads per page).

For example, in a child theme of Twenty Fourteen, this code would be added into content.php at a suitable location:

<?php 
//set the variables//
$nth = 3; //1,2,3,,4...; repeated every n-th post
$snr = 1; //1,2,3...; pre-set start with post nr
$limit = 3; //adsene TOS limit of ads per web page

$lsnr = $snr - 1; // correct for loop counter start at zero

if( $wp_query->current_post >= $lsnr && ( $wp_query->current_post - $lsnr )%$nth == 0 && (int)(( $wp_query->current_post - $lsnr ) / $nth ) < $limit ) { ?>
ADSENSE CODE
<?php } ?>

The example values would start the add in the first post, and repeated every three posts for a maximum of 3 ads.

Alphabetize Category Posts Using ‘pre_get_posts’ Action

Occasionally you want to have a different sort order in some of the category archives, for example, you want to output the posts of a specific category in alphabetical order.
Instead of having to create a category template for each of those categories and to add a custom query to change the query parameters, WordPress providdes the ‘pre_get_posts’ action where you can add a corresponding function:

function category_archive_sort_alphabetical( $query ) {
    if ( is_admin() || ! $query->is_main_query() )
        return;

    if ( is_category( array( 'Category One', 'category-two', 'Another Cat' ) ) ) {
		$query->set( 'orderby', 'title' );
		$query->set( 'order', 'ASC' );
        return;
    }
}
add_action( 'pre_get_posts', 'category_archive_sort_alphabetical', 1 );

resources:
http://codex.wordpress.org/Plugin_API/Action_Reference/pre_get_posts
http://codex.wordpress.org/Function_Reference/is_category

WordPress Changing Pluggable Functions Without Child Theme

A new concept (?) – to change a pluggable function of a WordPress theme without creating a child theme.

Example – to remove the  post tags output from the posts of Twenty Twelve.

Often, these things can be done by editing the styles of the theme, however in this case, CSS would not work as the tags don’t have their own CSS class.

Creating a child theme is usually recommended as the easiest option; but this might be over the top if the only changed paremeters are from some pluggable functions.

The alternative way would be to create a plugin to alter (in this example) the post-meta-data output, which is done through the function ‘twentytwelve_entry_meta()’.

How to:
use FTP to create a file, for example with the file name twentytwelve-entry-meta-modified.php, in the /wp-content/plugins/ folder; and add this example code (http://pastebin.com/7dMVvC9E)

<?php
/*
Plugin Name: Entry Meta Twenty Twelve Modified
Plugin URI: n/a
Description: personalization of the entry meta of Twenty Twelve without child theme; in this particular example the removal of the tags.
Version: 1.0
Author: alchymyth
Author URI: http://transformationpowertools.com
License: GPL2
*/

add_action( 'setup_theme', 'modify_pluggable_theme_functions' );

function modify_pluggable_theme_functions() {

if( wp_get_theme() == 'Twenty Twelve' && get_stylesheet_directory() == get_template_directory() ) :
//check for the right theme and that no child theme is used
function twentytwelve_entry_meta() {
// Translators: used between list items, there is a space after the comma.
$categories_list = get_the_category_list( __( ', ', 'twentytwelve' ) );

$date = sprintf( '<a href="%1$s" title="%2$s" rel="bookmark"><time datetime="%3$s">%4$s</time></a>',
esc_url( get_permalink() ),
esc_attr( get_the_time() ),
esc_attr( get_the_date( 'c' ) ),
esc_html( get_the_date() )
);

$author = sprintf( '<span><a href="%1$s" title="%2$s" rel="author">%3$s</a></span>',
esc_url( get_author_posts_url( get_the_author_meta( 'ID' ) ) ),
esc_attr( sprintf( __( 'View all posts by %s', 'twentytwelve' ), get_the_author() ) ),
get_the_author()
);

if ( $categories_list ) {
$utility_text = 'This entry was posted in %1$s on %2$s<span> by %3$s</span>.';
} else {
$utility_text = 'This entry was posted on %2$s<span> by %3$s</span>.';
}

printf(
$utility_text,
$categories_list,
$date,
$author
);
}
endif;
}
?>

The code checks that Twenty Twelve is the active theme, and that no child theme is activated.

Activate the plugin ‘Entry Meta Twenty Twelve Modified’ as usual from within dashboard – plugins.

http://codex.wordpress.org/Pluggable_Functions
http://codex.wordpress.org/FTP_Clients
http://codex.wordpress.org/Plugins
http://codex.wordpress.org/Writing_a_Plugin
http://codex.wordpress.org/Plugin_API/Action_Reference