<?php
/************* CODE BLOCK1 (BASED ON ALL COMMON TAGS) *************
* @Author: Boutros AbiChedid 
* @Credit: http://bacsoftwareconsulting.com/blog/
* @Date:   May 24, 2011
* Tested on WordPress version 3.1.2
* @Description: Code that shows other "Related Posts" to a post  
* based on ALL COMMON tags.
*******************************************************************/

//Retrieve the list of tags for a post. 
$tags = wp_get_post_tags($post->ID);

//If tags exist for the post.
if ($tags) {
    $tag_ids = array();
    //retrieve the tag_ids for the post.
    foreach($tags as $each_tag) 
        $tag_ids[] = $each_tag->term_id;
    
    //WP_Query arguments. 
    $args = array(
        'tag__in' => $tag_ids, //An array of tag IDs to be included.
        'post__not_in' => array($post->ID), //An array of post IDs to be excluded from the results.
        'orderby'=> 'rand', //Lists Related posts Randomly. *** MODIFY IF YOU LIKE ***
        'showposts' => 10, //*** MODIFY TO WHAT YOU LIKE.***  Number of related posts to show. 
        //'caller_get_posts' => 1 //*** USE THIS IF YOU ARE RUNNING WordPress Version < 3.1 ***
        'ignore_sticky_posts' => 1 //*** USE THIS for WordPress Version >= 3.1 ***
    );
    
    //WP_Query is a class defined in wp-includes/query.php 
    $query = new WP_Query($args);
    
    //If there are related posts.
    if( $query->have_posts() ) {
        echo '<div class="related">';
        echo '<h3>Related Article(s):</h3><ol>'; //*** MODIFY TITLE IF YOU LIKE ***
        
        //loop through the posts and list each until done.
        while ($query->have_posts()) {
            $query->the_post();
        ?>
            <li><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to: <?php the_title_attribute(); ?>">
            <?php the_title(); ?></a></li>
        <?php 
        }
        echo '</ol>';
        echo '</div>'; 
    }
}
//Destroy the previous query. This is a MUST, otherwise you will get the WRONG comments 
//(comments assigned to the wrong post), and sometimes categories and tags are for the wrong post.
wp_reset_query(); 						
?>

<?php
/********** CODE BLOCK2 (BASED ON ALL COMMON CATEGORIES) *********
* @Author: Boutros AbiChedid 
* @Credit: http://bacsoftwareconsulting.com/blog/
* @Date:   May 24, 2011
* Tested on WordPress version 3.1.2
* @Description: Code that shows other "Related Posts" to a post 
* based on ALL COMMON categories.
*******************************************************************/
      
//Retrieve the list of categories for a post.
$categories = get_the_category($post->ID);

//If categories exist for the post.
if ($categories) {
    $category_ids = array();
    
    //retrieve the category_ids for the post.
    foreach($categories as $each_category) 
        $category_ids[] = $each_category->term_id;
    
    //WP_Query arguments. 
    $args = array(
        'category__in' => $category_ids, //An array of category IDs to be included.
        'post__not_in' => array($post->ID), //An array of post IDs to be excluded from the results.
        'orderby'=> 'rand', //Lists Related posts Randomly. *** MODIFY IF YOU LIKE ***
        'showposts' => 10, //*** MODIFY TO WHAT YOU LIKE.***  Number of related posts to show. 
        //'caller_get_posts' => 1 //*** USE THIS IF YOU ARE RUNNING WordPress Version < 3.1 ***
        'ignore_sticky_posts' => 1 //*** USE THIS for WordPress Version >= 3.1 ***
    );
    
//WP_Query is a class defined in wp-includes/query.php 
$query = new WP_Query($args);

    //If there are related posts.
    if( $query->have_posts() ) {
        echo '<div class="related">';	
        echo '<h3>Related Post(s):</h3><ol>';	//*** MODIFY TITLE IF YOU LIKE ***
        
        //loop through the posts and list each until done.
        while ($query->have_posts()) {
            $query->the_post();
        ?>
            <li><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to: <?php the_title_attribute(); ?>">
            <?php the_title(); ?></a></li>
        <?php 
        }
        echo '</ol>';
        echo '</div>'; 
    }
}
//Destroy the previous query. This is a MUST, otherwise you will get the WRONG comments 
//(comments assigned to the wrong post), and sometimes categories and tags are for the wrong post.
wp_reset_query(); 
?>

<?php get_header(); ?>
<!-- part of the single.php code removed for brevity. --> 
<?php if (have_posts()) : while (have_posts()) : the_post(); ?>

<div <?php post_class() ?> id="post-<?php the_ID(); ?>">
    <div class="post_date">
        <span class="day"><?php the_time('d') ?></span><br />
        <span class="month"><?php the_time('M') ?></span><br />
        <span class="year"><?php the_time('Y') ?></span>
    </div>
        
    <div class="post_content">
        
      <h2><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></h2>      
     <div class="entry">
          <?php the_content('Read the rest of this entry &raquo;'); ?>
          <?php /*Added by BOUTROS ABICHEDID to split pages. */ wp_link_pages(array('before' => '<p><span class="strong">Pages:</span> ', 'after' => '</p>', 'next_or_number' => 'number')); ?>
     </div>
        
<!-- **START** of Related Posts Code. PLACE CODE BLOCK1 or CODE BLOCK2 between the **START** and **END**-->
                
        

<!-- **END** of Related Posts Code  --> 
     <!-- part of the single.php code was removed for brevity. -->      
     </div>
</div>

<div class="comments_content">
<?php comments_template(); ?>
</div>
<?php endwhile; else: ?>
<p id="rightcolumn" class="strong">Sorry, no posts matched your criteria.</p>
<?php endif; ?>
</div>
<?php get_sidebar(); ?>
<?php get_footer(); ?>
?>

/* Styling Related Posts Section by BOUTROS ABICHEDID */
.related {
    padding:5px 0 10px 0;
    margin:30px 0 0 0;
    clear: both;
    border-top:2px solid #EFE7D1;
    border-bottom:0;
    border-left:0;
    border-right:0;
}
.related li{
    padding:0 0 5px 0;
}